./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 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_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba --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 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 --- 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-b5237d8 [2022-11-22 00:14:29,028 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 00:14:29,030 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 00:14:29,069 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 00:14:29,069 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 00:14:29,085 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 00:14:29,087 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 00:14:29,090 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 00:14:29,093 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 00:14:29,098 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 00:14:29,100 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 00:14:29,102 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 00:14:29,102 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 00:14:29,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 00:14:29,106 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 00:14:29,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 00:14:29,110 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 00:14:29,111 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 00:14:29,112 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 00:14:29,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 00:14:29,120 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 00:14:29,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 00:14:29,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 00:14:29,125 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 00:14:29,134 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 00:14:29,135 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 00:14:29,135 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 00:14:29,137 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 00:14:29,137 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 00:14:29,138 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 00:14:29,139 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 00:14:29,140 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 00:14:29,141 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 00:14:29,144 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 00:14:29,145 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 00:14:29,145 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 00:14:29,146 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 00:14:29,146 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 00:14:29,147 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 00:14:29,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 00:14:29,149 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 00:14:29,150 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 00:14:29,190 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 00:14:29,190 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 00:14:29,191 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 00:14:29,191 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 00:14:29,192 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 00:14:29,193 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 00:14:29,193 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 00:14:29,193 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 00:14:29,193 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 00:14:29,194 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 00:14:29,195 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 00:14:29,195 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 00:14:29,196 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 00:14:29,196 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 00:14:29,196 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 00:14:29,196 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 00:14:29,197 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 00:14:29,197 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 00:14:29,198 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 00:14:29,198 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 00:14:29,199 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 00:14:29,199 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 00:14:29,199 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 00:14:29,199 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 00:14:29,200 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 00:14:29,200 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 00:14:29,201 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 00:14:29,201 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 00:14:29,201 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 00:14:29,202 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 00:14:29,202 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 00:14:29,202 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 00:14:29,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:14:29,203 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 00:14:29,203 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 00:14:29,204 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 00:14:29,204 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 00:14:29,204 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 00:14:29,205 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 00:14:29,205 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 00:14:29,205 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 00:14:29,205 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_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 [2022-11-22 00:14:29,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 00:14:29,524 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 00:14:29,527 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 00:14:29,529 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 00:14:29,543 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 00:14:29,549 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2022-11-22 00:14:32,610 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 00:14:32,824 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 00:14:32,824 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2022-11-22 00:14:32,833 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/data/b18649225/e1eae887881845ce81dc051ef06fe007/FLAGe15e44881 [2022-11-22 00:14:32,852 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/data/b18649225/e1eae887881845ce81dc051ef06fe007 [2022-11-22 00:14:32,855 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 00:14:32,857 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 00:14:32,862 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 00:14:32,862 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 00:14:32,866 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 00:14:32,867 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:14:32" (1/1) ... [2022-11-22 00:14:32,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34d9d6e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:32, skipping insertion in model container [2022-11-22 00:14:32,870 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 12:14:32" (1/1) ... [2022-11-22 00:14:32,879 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 00:14:32,909 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 00:14:33,126 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2022-11-22 00:14:33,163 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:14:33,174 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 00:14:33,189 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2022-11-22 00:14:33,200 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 00:14:33,216 INFO L208 MainTranslator]: Completed translation [2022-11-22 00:14:33,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33 WrapperNode [2022-11-22 00:14:33,217 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 00:14:33,219 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 00:14:33,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 00:14:33,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 00:14:33,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,235 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,253 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-11-22 00:14:33,253 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 00:14:33,254 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 00:14:33,254 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 00:14:33,254 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 00:14:33,266 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,267 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,279 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,280 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,284 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,288 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,290 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,291 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,302 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 00:14:33,303 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 00:14:33,304 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 00:14:33,304 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 00:14:33,305 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (1/1) ... [2022-11-22 00:14:33,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 00:14:33,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:33,338 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 00:14:33,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 00:14:33,391 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 00:14:33,391 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 00:14:33,391 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 00:14:33,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 00:14:33,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 00:14:33,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 00:14:33,392 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 00:14:33,392 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 00:14:33,458 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 00:14:33,460 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 00:14:33,672 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 00:14:33,728 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 00:14:33,729 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-22 00:14:33,731 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:14:33 BoogieIcfgContainer [2022-11-22 00:14:33,732 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 00:14:33,734 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 00:14:33,734 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 00:14:33,753 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 00:14:33,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 12:14:32" (1/3) ... [2022-11-22 00:14:33,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@609952be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:14:33, skipping insertion in model container [2022-11-22 00:14:33,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 12:14:33" (2/3) ... [2022-11-22 00:14:33,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@609952be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 12:14:33, skipping insertion in model container [2022-11-22 00:14:33,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 12:14:33" (3/3) ... [2022-11-22 00:14:33,757 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound20.c [2022-11-22 00:14:33,811 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 00:14:33,811 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 00:14:33,890 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 00:14:33,897 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;@65f256f8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 00:14:33,897 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 00:14:33,901 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-22 00:14:33,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 00:14:33,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:33,910 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:33,911 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:33,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:33,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2022-11-22 00:14:33,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:33,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548405231] [2022-11-22 00:14:33,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:33,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:34,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:34,054 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:34,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548405231] [2022-11-22 00:14:34,055 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 00:14:34,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680172135] [2022-11-22 00:14:34,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:34,055 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:34,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:34,067 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:34,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 00:14:34,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:34,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 00:14:34,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:34,212 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:34,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:14:34,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680172135] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:34,214 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:14:34,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 00:14:34,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462563999] [2022-11-22 00:14:34,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:34,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 00:14:34,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:34,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 00:14:34,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 00:14:34,267 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:34,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:34,317 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2022-11-22 00:14:34,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 00:14:34,320 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-22 00:14:34,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:34,326 INFO L225 Difference]: With dead ends: 54 [2022-11-22 00:14:34,326 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 00:14:34,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 00:14:34,333 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:34,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:14:34,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 00:14:34,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-22 00:14:34,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 00:14:34,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-22 00:14:34,366 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2022-11-22 00:14:34,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:34,368 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-22 00:14:34,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:34,368 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-22 00:14:34,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 00:14:34,370 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:34,370 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:34,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:34,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 00:14:34,585 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:34,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:34,587 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2022-11-22 00:14:34,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:34,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968488311] [2022-11-22 00:14:34,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:34,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:34,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:34,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:34,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968488311] [2022-11-22 00:14:34,667 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 00:14:34,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206100101] [2022-11-22 00:14:34,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:34,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:34,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:34,670 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:34,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 00:14:34,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:34,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 00:14:34,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:34,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:34,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:14:34,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206100101] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:34,804 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:14:34,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 00:14:34,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305576939] [2022-11-22 00:14:34,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:34,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 00:14:34,814 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:34,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 00:14:34,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:14:34,815 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:34,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:34,862 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2022-11-22 00:14:34,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 00:14:34,863 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-22 00:14:34,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:34,865 INFO L225 Difference]: With dead ends: 37 [2022-11-22 00:14:34,865 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 00:14:34,866 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 00:14:34,868 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:34,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:14:34,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 00:14:34,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-22 00:14:34,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 00:14:34,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-11-22 00:14:34,886 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2022-11-22 00:14:34,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:34,887 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-11-22 00:14:34,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:34,888 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-11-22 00:14:34,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 00:14:34,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:34,889 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:34,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:35,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:35,095 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:35,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:35,096 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2022-11-22 00:14:35,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:35,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038250541] [2022-11-22 00:14:35,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:35,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:35,121 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:35,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1554774944] [2022-11-22 00:14:35,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:35,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:35,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:35,128 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:35,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 00:14:35,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:35,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 00:14:35,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:35,262 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:14:35,263 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:14:35,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:35,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038250541] [2022-11-22 00:14:35,264 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:35,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554774944] [2022-11-22 00:14:35,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554774944] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:35,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:14:35,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 00:14:35,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868900703] [2022-11-22 00:14:35,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:35,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:14:35,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:35,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:14:35,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:14:35,267 INFO L87 Difference]: Start difference. First operand 30 states and 40 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:35,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:35,364 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-22 00:14:35,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:14:35,365 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2022-11-22 00:14:35,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:35,366 INFO L225 Difference]: With dead ends: 50 [2022-11-22 00:14:35,366 INFO L226 Difference]: Without dead ends: 43 [2022-11-22 00:14:35,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:14:35,368 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 45 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:35,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:14:35,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-22 00:14:35,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-11-22 00:14:35,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 00:14:35,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-11-22 00:14:35,377 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2022-11-22 00:14:35,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:35,377 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-11-22 00:14:35,377 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:35,377 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-11-22 00:14:35,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 00:14:35,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:35,378 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:35,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:35,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:35,596 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:35,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:35,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2022-11-22 00:14:35,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:35,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263978088] [2022-11-22 00:14:35,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:35,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:35,613 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:35,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1359569196] [2022-11-22 00:14:35,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:35,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:35,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:35,618 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:35,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 00:14:35,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:35,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 00:14:35,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:35,719 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:35,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:14:35,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:35,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263978088] [2022-11-22 00:14:35,720 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:35,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359569196] [2022-11-22 00:14:35,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359569196] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:35,720 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:14:35,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 00:14:35,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929177173] [2022-11-22 00:14:35,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:35,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:14:35,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:35,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:14:35,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:14:35,722 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:35,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:35,757 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-11-22 00:14:35,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 00:14:35,758 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-22 00:14:35,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:35,758 INFO L225 Difference]: With dead ends: 55 [2022-11-22 00:14:35,759 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 00:14:35,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:14:35,760 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:35,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:14:35,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 00:14:35,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-22 00:14:35,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 00:14:35,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-22 00:14:35,768 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2022-11-22 00:14:35,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:35,769 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-22 00:14:35,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:35,769 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-22 00:14:35,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 00:14:35,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:35,770 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:35,787 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-22 00:14:35,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:35,976 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:35,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:35,976 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2022-11-22 00:14:35,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:35,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084639773] [2022-11-22 00:14:35,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:35,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:36,005 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:36,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [42194298] [2022-11-22 00:14:36,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:36,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:36,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:36,028 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:36,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 00:14:36,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:36,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 00:14:36,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:36,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:14:36,430 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:14:36,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:36,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084639773] [2022-11-22 00:14:36,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:36,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42194298] [2022-11-22 00:14:36,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42194298] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:36,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:14:36,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-22 00:14:36,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344605834] [2022-11-22 00:14:36,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:36,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 00:14:36,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:36,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 00:14:36,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-22 00:14:36,433 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:36,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:36,546 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2022-11-22 00:14:36,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 00:14:36,547 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-22 00:14:36,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:36,548 INFO L225 Difference]: With dead ends: 51 [2022-11-22 00:14:36,549 INFO L226 Difference]: Without dead ends: 49 [2022-11-22 00:14:36,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-22 00:14:36,550 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 71 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:36,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 131 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:14:36,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-22 00:14:36,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-22 00:14:36,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 00:14:36,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-11-22 00:14:36,563 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2022-11-22 00:14:36,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:36,564 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-11-22 00:14:36,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 00:14:36,564 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-11-22 00:14:36,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 00:14:36,565 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:36,565 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:36,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:36,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:36,772 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:36,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:36,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2022-11-22 00:14:36,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:36,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170799241] [2022-11-22 00:14:36,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:36,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:36,794 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:36,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872245284] [2022-11-22 00:14:36,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:36,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:36,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:36,817 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:36,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 00:14:36,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:36,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 00:14:36,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:36,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:36,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:14:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:37,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:37,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170799241] [2022-11-22 00:14:37,042 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:37,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872245284] [2022-11-22 00:14:37,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872245284] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:14:37,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [846244641] [2022-11-22 00:14:37,062 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 00:14:37,062 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:14:37,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:14:37,071 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:14:37,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:14:38,046 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:14:38,098 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:14:41,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [846244641] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:41,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:14:41,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2022-11-22 00:14:41,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276808438] [2022-11-22 00:14:41,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:41,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 00:14:41,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:41,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 00:14:41,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2022-11-22 00:14:41,164 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:14:43,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:43,012 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2022-11-22 00:14:43,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 00:14:43,014 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-11-22 00:14:43,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:43,015 INFO L225 Difference]: With dead ends: 88 [2022-11-22 00:14:43,015 INFO L226 Difference]: Without dead ends: 66 [2022-11-22 00:14:43,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2022-11-22 00:14:43,017 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:43,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 145 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:14:43,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-22 00:14:43,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2022-11-22 00:14:43,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 00:14:43,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2022-11-22 00:14:43,058 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2022-11-22 00:14:43,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:43,058 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2022-11-22 00:14:43,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:14:43,060 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2022-11-22 00:14:43,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 00:14:43,061 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:43,061 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:43,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:43,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:43,269 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:43,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:43,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2022-11-22 00:14:43,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:43,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716105535] [2022-11-22 00:14:43,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:43,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:43,302 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:43,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [830478887] [2022-11-22 00:14:43,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:43,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:43,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:43,307 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:43,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 00:14:43,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:43,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 00:14:43,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:43,772 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:14:43,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:14:44,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:44,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716105535] [2022-11-22 00:14:44,150 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:44,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830478887] [2022-11-22 00:14:44,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830478887] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 00:14:44,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [628680726] [2022-11-22 00:14:44,153 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-22 00:14:44,153 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:14:44,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:14:44,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:14:44,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:14:44,459 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-22 00:14:44,469 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:14:44,501 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:14:47,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [628680726] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:47,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 00:14:47,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [13] total 29 [2022-11-22 00:14:47,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429111506] [2022-11-22 00:14:47,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:47,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 00:14:47,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:47,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 00:14:47,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:14:47,168 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 00:14:47,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:47,645 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2022-11-22 00:14:47,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 00:14:47,646 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2022-11-22 00:14:47,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:47,648 INFO L225 Difference]: With dead ends: 110 [2022-11-22 00:14:47,648 INFO L226 Difference]: Without dead ends: 73 [2022-11-22 00:14:47,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:14:47,655 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:47,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 123 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 00:14:47,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-22 00:14:47,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2022-11-22 00:14:47,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-22 00:14:47,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2022-11-22 00:14:47,686 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2022-11-22 00:14:47,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:47,687 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2022-11-22 00:14:47,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 00:14:47,687 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2022-11-22 00:14:47,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 00:14:47,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:47,692 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:47,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:47,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:47,908 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:47,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:47,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2022-11-22 00:14:47,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:47,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646410777] [2022-11-22 00:14:47,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:47,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:47,927 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:47,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079979949] [2022-11-22 00:14:47,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:47,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:47,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:47,940 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:47,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 00:14:48,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:48,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 00:14:48,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:48,262 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 00:14:48,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:14:48,385 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 00:14:48,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:48,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646410777] [2022-11-22 00:14:48,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:48,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079979949] [2022-11-22 00:14:48,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079979949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:14:48,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [765765057] [2022-11-22 00:14:48,388 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-22 00:14:48,389 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:14:48,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:14:48,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:14:48,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:14:49,169 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-22 00:14:49,185 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:14:49,211 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:14:54,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [765765057] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:14:54,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:14:54,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2022-11-22 00:14:54,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828561316] [2022-11-22 00:14:54,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:14:54,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 00:14:54,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:14:54,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 00:14:54,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-11-22 00:14:54,067 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:14:57,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:14:57,064 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2022-11-22 00:14:57,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 00:14:57,064 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-11-22 00:14:57,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:14:57,065 INFO L225 Difference]: With dead ends: 108 [2022-11-22 00:14:57,066 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 00:14:57,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 00:14:57,068 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 00:14:57,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 154 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 00:14:57,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 00:14:57,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-22 00:14:57,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-22 00:14:57,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2022-11-22 00:14:57,092 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2022-11-22 00:14:57,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:14:57,093 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2022-11-22 00:14:57,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 00:14:57,095 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2022-11-22 00:14:57,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-22 00:14:57,102 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:14:57,102 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:14:57,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 00:14:57,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:57,308 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:14:57,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:14:57,309 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2022-11-22 00:14:57,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:14:57,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504855025] [2022-11-22 00:14:57,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:57,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:14:57,321 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:14:57,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1066776218] [2022-11-22 00:14:57,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:14:57,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:14:57,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:14:57,323 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:14:57,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 00:14:57,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:14:57,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 00:14:57,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:14:57,482 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:14:57,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:14:57,578 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:14:57,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:14:57,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504855025] [2022-11-22 00:14:57,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:14:57,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066776218] [2022-11-22 00:14:57,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066776218] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:14:57,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [178430069] [2022-11-22 00:14:57,582 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:14:57,582 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:14:57,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:14:57,583 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:14:57,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:15:04,674 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-22 00:15:04,683 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:15:04,714 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:15:09,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [178430069] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:15:09,875 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:15:09,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2022-11-22 00:15:09,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676932428] [2022-11-22 00:15:09,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:15:09,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 00:15:09,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:09,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 00:15:09,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-11-22 00:15:09,877 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-22 00:15:10,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:10,585 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2022-11-22 00:15:10,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 00:15:10,586 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-11-22 00:15:10,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:10,590 INFO L225 Difference]: With dead ends: 138 [2022-11-22 00:15:10,591 INFO L226 Difference]: Without dead ends: 101 [2022-11-22 00:15:10,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2022-11-22 00:15:10,596 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:10,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:15:10,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-22 00:15:10,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-11-22 00:15:10,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-22 00:15:10,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2022-11-22 00:15:10,640 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2022-11-22 00:15:10,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:10,640 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2022-11-22 00:15:10,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-22 00:15:10,641 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2022-11-22 00:15:10,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 00:15:10,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:10,643 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:10,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:10,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:10,849 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:15:10,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:10,849 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2022-11-22 00:15:10,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:10,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161577588] [2022-11-22 00:15:10,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:10,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:10,860 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:15:10,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [190817782] [2022-11-22 00:15:10,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:10,861 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:10,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:10,862 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:10,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 00:15:10,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:10,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 00:15:10,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 00:15:10,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:11,090 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 00:15:11,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:11,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161577588] [2022-11-22 00:15:11,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:15:11,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190817782] [2022-11-22 00:15:11,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190817782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:11,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495891701] [2022-11-22 00:15:11,094 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 00:15:11,095 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:11,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:15:11,096 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:15:11,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:15:16,752 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-22 00:15:16,798 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:15:16,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:15:19,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3013#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:15:19,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:15:19,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:15:19,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 00:15:19,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834348183] [2022-11-22 00:15:19,967 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:19,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 00:15:19,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:19,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 00:15:19,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-11-22 00:15:19,969 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-22 00:15:20,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:20,124 INFO L93 Difference]: Finished difference Result 105 states and 134 transitions. [2022-11-22 00:15:20,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 00:15:20,125 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2022-11-22 00:15:20,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:20,127 INFO L225 Difference]: With dead ends: 105 [2022-11-22 00:15:20,127 INFO L226 Difference]: Without dead ends: 103 [2022-11-22 00:15:20,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 00:15:20,128 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:20,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 84 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:15:20,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-22 00:15:20,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2022-11-22 00:15:20,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 74 states have internal predecessors, (89), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-22 00:15:20,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 130 transitions. [2022-11-22 00:15:20,177 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 130 transitions. Word has length 48 [2022-11-22 00:15:20,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:20,180 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 130 transitions. [2022-11-22 00:15:20,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-22 00:15:20,180 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 130 transitions. [2022-11-22 00:15:20,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 00:15:20,182 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:20,183 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:20,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:20,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 00:15:20,389 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:15:20,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:20,389 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2022-11-22 00:15:20,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:20,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019931578] [2022-11-22 00:15:20,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:20,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:20,400 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:15:20,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1834315445] [2022-11-22 00:15:20,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:20,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:20,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:20,402 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:20,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 00:15:20,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:20,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 00:15:20,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:20,573 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:15:20,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:20,673 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:15:20,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:20,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019931578] [2022-11-22 00:15:20,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:15:20,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834315445] [2022-11-22 00:15:20,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834315445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:20,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226079609] [2022-11-22 00:15:20,677 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:15:20,677 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:20,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:15:20,678 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:15:20,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:15:25,949 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:15:29,882 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:15:29,887 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:15:29,910 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:15:47,397 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3627#(and (<= ~counter~0 22) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:15:47,397 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:15:47,397 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:15:47,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-22 00:15:47,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139327209] [2022-11-22 00:15:47,398 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:15:47,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 00:15:47,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:15:47,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 00:15:47,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 00:15:47,400 INFO L87 Difference]: Start difference. First operand 101 states and 130 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:15:47,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:15:47,896 INFO L93 Difference]: Finished difference Result 508 states and 648 transitions. [2022-11-22 00:15:47,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 00:15:47,897 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-11-22 00:15:47,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:15:47,906 INFO L225 Difference]: With dead ends: 508 [2022-11-22 00:15:47,907 INFO L226 Difference]: Without dead ends: 501 [2022-11-22 00:15:47,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 00:15:47,909 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 273 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:15:47,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 392 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:15:47,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-22 00:15:48,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 390. [2022-11-22 00:15:48,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 274 states have (on average 1.27007299270073) internal successors, (348), 284 states have internal predecessors, (348), 81 states have call successors, (81), 34 states have call predecessors, (81), 34 states have return successors, (76), 71 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-22 00:15:48,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 505 transitions. [2022-11-22 00:15:48,014 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 505 transitions. Word has length 48 [2022-11-22 00:15:48,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:15:48,014 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 505 transitions. [2022-11-22 00:15:48,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:15:48,015 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 505 transitions. [2022-11-22 00:15:48,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 00:15:48,016 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:15:48,016 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:15:48,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 00:15:48,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:48,222 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:15:48,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:15:48,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2022-11-22 00:15:48,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:15:48,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795869691] [2022-11-22 00:15:48,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:48,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:15:48,235 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:15:48,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [139479549] [2022-11-22 00:15:48,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:15:48,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:15:48,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:15:48,237 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:15:48,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 00:15:48,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:15:48,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-22 00:15:48,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:15:49,078 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:15:49,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:15:50,058 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 00:15:50,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:15:50,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795869691] [2022-11-22 00:15:50,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:15:50,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139479549] [2022-11-22 00:15:50,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139479549] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:15:50,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012318179] [2022-11-22 00:15:50,061 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:15:50,061 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:15:50,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:15:50,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:15:50,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:15:55,091 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:15:58,277 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 00:15:58,280 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:15:58,303 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:16:22,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5255#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 00:16:22,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:16:22,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:16:22,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-11-22 00:16:22,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370915555] [2022-11-22 00:16:22,142 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:22,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 00:16:22,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:22,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 00:16:22,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 00:16:22,145 INFO L87 Difference]: Start difference. First operand 390 states and 505 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 00:16:35,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:35,751 INFO L93 Difference]: Finished difference Result 845 states and 1155 transitions. [2022-11-22 00:16:35,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 00:16:35,752 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 49 [2022-11-22 00:16:35,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:35,756 INFO L225 Difference]: With dead ends: 845 [2022-11-22 00:16:35,756 INFO L226 Difference]: Without dead ends: 641 [2022-11-22 00:16:35,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=670, Invalid=5030, Unknown=0, NotChecked=0, Total=5700 [2022-11-22 00:16:35,759 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 301 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:35,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 459 Invalid, 1543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2022-11-22 00:16:35,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-11-22 00:16:35,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 501. [2022-11-22 00:16:35,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 364 states have (on average 1.3104395604395604) internal successors, (477), 371 states have internal predecessors, (477), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-22 00:16:35,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 676 transitions. [2022-11-22 00:16:35,908 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 676 transitions. Word has length 49 [2022-11-22 00:16:35,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:35,909 INFO L495 AbstractCegarLoop]: Abstraction has 501 states and 676 transitions. [2022-11-22 00:16:35,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 00:16:35,909 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 676 transitions. [2022-11-22 00:16:35,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 00:16:35,912 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:35,913 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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] [2022-11-22 00:16:35,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 00:16:36,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:36,119 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:16:36,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:36,119 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2022-11-22 00:16:36,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:36,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536908800] [2022-11-22 00:16:36,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:36,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:36,128 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:16:36,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [965245937] [2022-11-22 00:16:36,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:36,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:36,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:16:36,131 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:16:36,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 00:16:36,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:36,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 00:16:36,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:16:36,237 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 00:16:36,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:36,323 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 00:16:36,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:16:36,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536908800] [2022-11-22 00:16:36,324 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:16:36,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965245937] [2022-11-22 00:16:36,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965245937] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:36,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070180812] [2022-11-22 00:16:36,328 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 00:16:36,328 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:36,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:16:36,330 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:16:36,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:16:45,296 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:16:45,301 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:16:45,319 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:16:50,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7559#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:16:50,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:16:50,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:16:50,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 00:16:50,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528440192] [2022-11-22 00:16:50,945 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:16:50,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 00:16:50,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:16:50,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 00:16:50,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2022-11-22 00:16:50,947 INFO L87 Difference]: Start difference. First operand 501 states and 676 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:16:51,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:16:51,179 INFO L93 Difference]: Finished difference Result 533 states and 705 transitions. [2022-11-22 00:16:51,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 00:16:51,179 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2022-11-22 00:16:51,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:16:51,182 INFO L225 Difference]: With dead ends: 533 [2022-11-22 00:16:51,183 INFO L226 Difference]: Without dead ends: 531 [2022-11-22 00:16:51,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=136, Invalid=986, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 00:16:51,184 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:16:51,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 131 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:16:51,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2022-11-22 00:16:51,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 525. [2022-11-22 00:16:51,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 382 states have (on average 1.2958115183246073) internal successors, (495), 389 states have internal predecessors, (495), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-22 00:16:51,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 694 transitions. [2022-11-22 00:16:51,344 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 694 transitions. Word has length 50 [2022-11-22 00:16:51,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:16:51,344 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 694 transitions. [2022-11-22 00:16:51,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:16:51,345 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 694 transitions. [2022-11-22 00:16:51,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-22 00:16:51,346 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:16:51,346 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1] [2022-11-22 00:16:51,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 00:16:51,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 00:16:51,552 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:16:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:16:51,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2022-11-22 00:16:51,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:16:51,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428455032] [2022-11-22 00:16:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:51,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:16:51,563 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:16:51,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764970939] [2022-11-22 00:16:51,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:16:51,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:16:51,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:16:51,565 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:16:51,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 00:16:51,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:16:51,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 00:16:51,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:16:51,686 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 00:16:51,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:16:51,783 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 00:16:51,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:16:51,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428455032] [2022-11-22 00:16:51,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:16:51,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764970939] [2022-11-22 00:16:51,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764970939] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:16:51,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95230564] [2022-11-22 00:16:51,791 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 00:16:51,791 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:16:51,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:16:51,792 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:16:51,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:17:12,629 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-22 00:17:12,668 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:17:12,690 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:17:16,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9414#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:17:16,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:17:16,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:17:16,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-22 00:17:16,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612295517] [2022-11-22 00:17:16,696 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:17:16,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 00:17:16,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:17:16,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 00:17:16,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 00:17:16,697 INFO L87 Difference]: Start difference. First operand 525 states and 694 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:17:17,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:17:17,139 INFO L93 Difference]: Finished difference Result 790 states and 1036 transitions. [2022-11-22 00:17:17,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 00:17:17,140 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2022-11-22 00:17:17,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:17:17,143 INFO L225 Difference]: With dead ends: 790 [2022-11-22 00:17:17,143 INFO L226 Difference]: Without dead ends: 528 [2022-11-22 00:17:17,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 00:17:17,145 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 139 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 00:17:17,146 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 252 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 00:17:17,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-22 00:17:17,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 503. [2022-11-22 00:17:17,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 363 states have (on average 1.2506887052341598) internal successors, (454), 368 states have internal predecessors, (454), 98 states have call successors, (98), 41 states have call predecessors, (98), 41 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-22 00:17:17,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 648 transitions. [2022-11-22 00:17:17,333 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 648 transitions. Word has length 55 [2022-11-22 00:17:17,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:17:17,333 INFO L495 AbstractCegarLoop]: Abstraction has 503 states and 648 transitions. [2022-11-22 00:17:17,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:17:17,334 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 648 transitions. [2022-11-22 00:17:17,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 00:17:17,335 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:17:17,335 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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] [2022-11-22 00:17:17,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 00:17:17,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 00:17:17,546 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:17:17,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:17:17,547 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2022-11-22 00:17:17,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:17:17,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131849079] [2022-11-22 00:17:17,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:17,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:17:17,561 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:17:17,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674550563] [2022-11-22 00:17:17,566 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:17:17,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:17,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:17:17,568 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:17:17,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 00:17:17,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 00:17:17,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:17:17,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-22 00:17:17,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:17:17,753 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-11-22 00:17:17,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:17:17,844 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-22 00:17:17,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:17:17,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131849079] [2022-11-22 00:17:17,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:17:17,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674550563] [2022-11-22 00:17:17,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674550563] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 00:17:17,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 00:17:17,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-22 00:17:17,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544671703] [2022-11-22 00:17:17,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:17:17,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:17:17,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:17:17,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:17:17,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 00:17:17,846 INFO L87 Difference]: Start difference. First operand 503 states and 648 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:17:18,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:17:18,033 INFO L93 Difference]: Finished difference Result 544 states and 686 transitions. [2022-11-22 00:17:18,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:17:18,034 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2022-11-22 00:17:18,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:17:18,036 INFO L225 Difference]: With dead ends: 544 [2022-11-22 00:17:18,037 INFO L226 Difference]: Without dead ends: 542 [2022-11-22 00:17:18,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-22 00:17:18,038 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 00:17:18,038 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 111 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 00:17:18,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-22 00:17:18,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 535. [2022-11-22 00:17:18,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 387 states have (on average 1.2299741602067182) internal successors, (476), 392 states have internal predecessors, (476), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-22 00:17:18,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 670 transitions. [2022-11-22 00:17:18,174 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 670 transitions. Word has length 58 [2022-11-22 00:17:18,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:17:18,175 INFO L495 AbstractCegarLoop]: Abstraction has 535 states and 670 transitions. [2022-11-22 00:17:18,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:17:18,175 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 670 transitions. [2022-11-22 00:17:18,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 00:17:18,176 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:17:18,176 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 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] [2022-11-22 00:17:18,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 00:17:18,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:18,382 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:17:18,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:17:18,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2022-11-22 00:17:18,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:17:18,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14733431] [2022-11-22 00:17:18,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:18,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:17:18,391 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:17:18,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [678744226] [2022-11-22 00:17:18,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:17:18,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:18,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:17:18,393 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:17:18,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 00:17:18,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 00:17:18,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:17:18,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 00:17:18,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:17:18,585 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-22 00:17:18,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:17:18,676 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 00:17:18,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:17:18,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14733431] [2022-11-22 00:17:18,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:17:18,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678744226] [2022-11-22 00:17:18,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678744226] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 00:17:18,677 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 00:17:18,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-11-22 00:17:18,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160317932] [2022-11-22 00:17:18,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:17:18,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:17:18,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:17:18,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:17:18,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-11-22 00:17:18,679 INFO L87 Difference]: Start difference. First operand 535 states and 670 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:17:18,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:17:18,957 INFO L93 Difference]: Finished difference Result 613 states and 770 transitions. [2022-11-22 00:17:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:17:18,958 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2022-11-22 00:17:18,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:17:18,961 INFO L225 Difference]: With dead ends: 613 [2022-11-22 00:17:18,961 INFO L226 Difference]: Without dead ends: 611 [2022-11-22 00:17:18,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-22 00:17:18,963 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 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 [2022-11-22 00:17:18,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:17:18,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2022-11-22 00:17:19,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 602. [2022-11-22 00:17:19,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 428 states have (on average 1.2289719626168225) internal successors, (526), 434 states have internal predecessors, (526), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2022-11-22 00:17:19,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 756 transitions. [2022-11-22 00:17:19,140 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 756 transitions. Word has length 60 [2022-11-22 00:17:19,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:17:19,141 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 756 transitions. [2022-11-22 00:17:19,141 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 00:17:19,141 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 756 transitions. [2022-11-22 00:17:19,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 00:17:19,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:17:19,143 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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, 1, 1, 1] [2022-11-22 00:17:19,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 00:17:19,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 00:17:19,347 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:17:19,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:17:19,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2022-11-22 00:17:19,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:17:19,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474662969] [2022-11-22 00:17:19,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:19,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:17:19,356 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:17:19,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592016676] [2022-11-22 00:17:19,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:19,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:19,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:17:19,368 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:17:19,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 00:17:19,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:17:19,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-22 00:17:19,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:17:19,520 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:17:19,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:17:19,633 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:17:19,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:17:19,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474662969] [2022-11-22 00:17:19,634 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:17:19,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592016676] [2022-11-22 00:17:19,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592016676] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:17:19,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [596828665] [2022-11-22 00:17:19,636 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 00:17:19,636 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:17:19,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:17:19,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:17:19,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:17:24,066 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:17:28,228 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:17:28,232 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:17:28,256 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:17:43,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15591#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:17:43,993 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:17:43,993 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:17:43,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2022-11-22 00:17:43,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947443226] [2022-11-22 00:17:43,993 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:17:43,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 00:17:43,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:17:43,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 00:17:43,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 00:17:43,995 INFO L87 Difference]: Start difference. First operand 602 states and 756 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:17:44,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:17:44,956 INFO L93 Difference]: Finished difference Result 1248 states and 1622 transitions. [2022-11-22 00:17:44,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 00:17:44,957 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2022-11-22 00:17:44,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:17:44,963 INFO L225 Difference]: With dead ends: 1248 [2022-11-22 00:17:44,964 INFO L226 Difference]: Without dead ends: 1097 [2022-11-22 00:17:44,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=368, Invalid=1794, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 00:17:44,966 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 289 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:17:44,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 355 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 00:17:44,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-11-22 00:17:45,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1030. [2022-11-22 00:17:45,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 720 states have (on average 1.2166666666666666) internal successors, (876), 735 states have internal predecessors, (876), 219 states have call successors, (219), 90 states have call predecessors, (219), 90 states have return successors, (214), 204 states have call predecessors, (214), 214 states have call successors, (214) [2022-11-22 00:17:45,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1309 transitions. [2022-11-22 00:17:45,403 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1309 transitions. Word has length 60 [2022-11-22 00:17:45,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:17:45,404 INFO L495 AbstractCegarLoop]: Abstraction has 1030 states and 1309 transitions. [2022-11-22 00:17:45,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:17:45,404 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1309 transitions. [2022-11-22 00:17:45,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 00:17:45,406 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:17:45,406 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2022-11-22 00:17:45,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 00:17:45,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 00:17:45,611 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:17:45,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:17:45,611 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2022-11-22 00:17:45,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:17:45,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393419474] [2022-11-22 00:17:45,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:45,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:17:45,620 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:17:45,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1715440941] [2022-11-22 00:17:45,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:17:45,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:17:45,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:17:45,622 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:17:45,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 00:17:45,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:17:45,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 00:17:45,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:17:46,671 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 00:17:46,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:17:47,338 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 00:17:47,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:17:47,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393419474] [2022-11-22 00:17:47,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:17:47,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715440941] [2022-11-22 00:17:47,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715440941] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:17:47,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999513039] [2022-11-22 00:17:47,340 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 00:17:47,340 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:17:47,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:17:47,340 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:17:47,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:17:51,045 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-22 00:17:51,045 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:17:54,014 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:17:54,018 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:17:54,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:18:04,615 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19262#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:18:04,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:18:04,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:18:04,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-11-22 00:18:04,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266564485] [2022-11-22 00:18:04,615 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:18:04,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 00:18:04,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:18:04,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 00:18:04,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1780, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 00:18:04,617 INFO L87 Difference]: Start difference. First operand 1030 states and 1309 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 00:18:48,743 WARN L233 SmtUtils]: Spent 6.96s on a formula simplification. DAG size of input: 35 DAG size of output: 30 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 00:19:22,165 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 [] [2022-11-22 00:19:26,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:19:26,949 INFO L93 Difference]: Finished difference Result 1748 states and 2329 transitions. [2022-11-22 00:19:26,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 00:19:26,950 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 61 [2022-11-22 00:19:26,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:19:26,956 INFO L225 Difference]: With dead ends: 1748 [2022-11-22 00:19:26,957 INFO L226 Difference]: Without dead ends: 1420 [2022-11-22 00:19:26,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 66.8s TimeCoverageRelationStatistics Valid=703, Invalid=5777, Unknown=0, NotChecked=0, Total=6480 [2022-11-22 00:19:26,961 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 330 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 1446 mSolverCounterSat, 303 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 1750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 303 IncrementalHoareTripleChecker+Valid, 1446 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:19:26,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 731 Invalid, 1750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [303 Valid, 1446 Invalid, 1 Unknown, 0 Unchecked, 26.5s Time] [2022-11-22 00:19:26,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-22 00:19:27,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1146. [2022-11-22 00:19:27,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 813 states have (on average 1.2533825338253382) internal successors, (1019), 835 states have internal predecessors, (1019), 247 states have call successors, (247), 85 states have call predecessors, (247), 85 states have return successors, (242), 225 states have call predecessors, (242), 242 states have call successors, (242) [2022-11-22 00:19:27,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1508 transitions. [2022-11-22 00:19:27,534 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1508 transitions. Word has length 61 [2022-11-22 00:19:27,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:19:27,534 INFO L495 AbstractCegarLoop]: Abstraction has 1146 states and 1508 transitions. [2022-11-22 00:19:27,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 00:19:27,535 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1508 transitions. [2022-11-22 00:19:27,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 00:19:27,537 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:19:27,538 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2022-11-22 00:19:27,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 00:19:27,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 00:19:27,744 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:19:27,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:19:27,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2022-11-22 00:19:27,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:19:27,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288509760] [2022-11-22 00:19:27,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:19:27,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:19:27,774 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:19:27,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1670811760] [2022-11-22 00:19:27,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:19:27,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:27,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:19:27,777 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:19:27,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 00:19:27,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 00:19:27,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:19:27,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 00:19:27,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:19:27,891 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-22 00:19:27,892 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:19:27,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:19:27,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288509760] [2022-11-22 00:19:27,892 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:19:27,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670811760] [2022-11-22 00:19:27,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670811760] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:19:27,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:19:27,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 00:19:27,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707536186] [2022-11-22 00:19:27,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:19:27,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:19:27,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:19:27,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:19:27,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:19:27,895 INFO L87 Difference]: Start difference. First operand 1146 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 00:19:28,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:19:28,516 INFO L93 Difference]: Finished difference Result 1441 states and 1900 transitions. [2022-11-22 00:19:28,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:19:28,517 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 61 [2022-11-22 00:19:28,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:19:28,522 INFO L225 Difference]: With dead ends: 1441 [2022-11-22 00:19:28,522 INFO L226 Difference]: Without dead ends: 1209 [2022-11-22 00:19:28,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 00:19:28,524 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:19:28,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 137 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:19:28,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2022-11-22 00:19:28,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1010. [2022-11-22 00:19:28,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1010 states, 719 states have (on average 1.228094575799722) internal successors, (883), 732 states have internal predecessors, (883), 205 states have call successors, (205), 85 states have call predecessors, (205), 85 states have return successors, (200), 192 states have call predecessors, (200), 200 states have call successors, (200) [2022-11-22 00:19:29,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1010 states to 1010 states and 1288 transitions. [2022-11-22 00:19:29,004 INFO L78 Accepts]: Start accepts. Automaton has 1010 states and 1288 transitions. Word has length 61 [2022-11-22 00:19:29,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:19:29,004 INFO L495 AbstractCegarLoop]: Abstraction has 1010 states and 1288 transitions. [2022-11-22 00:19:29,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 00:19:29,004 INFO L276 IsEmpty]: Start isEmpty. Operand 1010 states and 1288 transitions. [2022-11-22 00:19:29,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 00:19:29,005 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:19:29,006 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 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] [2022-11-22 00:19:29,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 00:19:29,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:29,211 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:19:29,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:19:29,212 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2022-11-22 00:19:29,212 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:19:29,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651454671] [2022-11-22 00:19:29,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:19:29,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:19:29,220 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:19:29,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1468856136] [2022-11-22 00:19:29,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 00:19:29,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:29,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:19:29,223 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:19:29,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 00:19:29,288 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 00:19:29,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:19:29,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 00:19:29,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:19:29,344 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-22 00:19:29,344 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 00:19:29,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:19:29,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651454671] [2022-11-22 00:19:29,345 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:19:29,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468856136] [2022-11-22 00:19:29,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468856136] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 00:19:29,345 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 00:19:29,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 00:19:29,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236096893] [2022-11-22 00:19:29,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 00:19:29,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 00:19:29,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:19:29,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 00:19:29,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 00:19:29,347 INFO L87 Difference]: Start difference. First operand 1010 states and 1288 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 00:19:29,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:19:29,792 INFO L93 Difference]: Finished difference Result 1627 states and 2121 transitions. [2022-11-22 00:19:29,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 00:19:29,792 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2022-11-22 00:19:29,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:19:29,797 INFO L225 Difference]: With dead ends: 1627 [2022-11-22 00:19:29,797 INFO L226 Difference]: Without dead ends: 1176 [2022-11-22 00:19:29,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-22 00:19:29,799 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 00:19:29,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 96 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 00:19:29,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2022-11-22 00:19:30,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1126. [2022-11-22 00:19:30,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 787 states have (on average 1.2325285895806861) internal successors, (970), 796 states have internal predecessors, (970), 253 states have call successors, (253), 85 states have call predecessors, (253), 85 states have return successors, (248), 244 states have call predecessors, (248), 248 states have call successors, (248) [2022-11-22 00:19:30,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1471 transitions. [2022-11-22 00:19:30,195 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1471 transitions. Word has length 64 [2022-11-22 00:19:30,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:19:30,196 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1471 transitions. [2022-11-22 00:19:30,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 00:19:30,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1471 transitions. [2022-11-22 00:19:30,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 00:19:30,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:19:30,197 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 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] [2022-11-22 00:19:30,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 00:19:30,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:30,408 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:19:30,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:19:30,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2022-11-22 00:19:30,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:19:30,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433956269] [2022-11-22 00:19:30,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:19:30,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:19:30,416 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:19:30,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1784271933] [2022-11-22 00:19:30,417 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 00:19:30,417 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:19:30,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:19:30,418 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:19:30,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 00:19:30,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:19:30,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-22 00:19:30,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:19:31,692 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-22 00:19:31,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:19:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 00:19:33,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:19:33,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433956269] [2022-11-22 00:19:33,186 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:19:33,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784271933] [2022-11-22 00:19:33,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784271933] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:19:33,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1801115155] [2022-11-22 00:19:33,188 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 00:19:33,189 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:19:33,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:19:33,189 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:19:33,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:19:38,635 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:19:42,004 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:19:42,008 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:19:42,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:20:08,064 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31792#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:20:08,064 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:20:08,064 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:20:08,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-11-22 00:20:08,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121873965] [2022-11-22 00:20:08,065 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:20:08,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 00:20:08,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:20:08,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 00:20:08,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 00:20:08,068 INFO L87 Difference]: Start difference. First operand 1126 states and 1471 transitions. Second operand has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-22 00:20:47,184 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 00:21:24,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:21:24,910 INFO L93 Difference]: Finished difference Result 1694 states and 2285 transitions. [2022-11-22 00:21:24,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-22 00:21:24,910 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 66 [2022-11-22 00:21:24,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:21:24,918 INFO L225 Difference]: With dead ends: 1694 [2022-11-22 00:21:24,918 INFO L226 Difference]: Without dead ends: 1688 [2022-11-22 00:21:24,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2449 ImplicationChecksByTransitivity, 71.0s TimeCoverageRelationStatistics Valid=1107, Invalid=6549, Unknown=0, NotChecked=0, Total=7656 [2022-11-22 00:21:24,922 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 454 mSDsluCounter, 707 mSDsCounter, 0 mSdLazyCounter, 1429 mSolverCounterSat, 367 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 455 SdHoareTripleChecker+Valid, 803 SdHoareTripleChecker+Invalid, 1796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 367 IncrementalHoareTripleChecker+Valid, 1429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.3s IncrementalHoareTripleChecker+Time [2022-11-22 00:21:24,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [455 Valid, 803 Invalid, 1796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [367 Valid, 1429 Invalid, 0 Unknown, 0 Unchecked, 32.3s Time] [2022-11-22 00:21:24,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1688 states. [2022-11-22 00:21:25,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1688 to 1430. [2022-11-22 00:21:25,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1430 states, 1014 states have (on average 1.2504930966469427) internal successors, (1268), 1022 states have internal predecessors, (1268), 310 states have call successors, (310), 106 states have call predecessors, (310), 105 states have return successors, (306), 301 states have call predecessors, (306), 306 states have call successors, (306) [2022-11-22 00:21:25,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1430 states to 1430 states and 1884 transitions. [2022-11-22 00:21:25,585 INFO L78 Accepts]: Start accepts. Automaton has 1430 states and 1884 transitions. Word has length 66 [2022-11-22 00:21:25,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:21:25,586 INFO L495 AbstractCegarLoop]: Abstraction has 1430 states and 1884 transitions. [2022-11-22 00:21:25,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-22 00:21:25,586 INFO L276 IsEmpty]: Start isEmpty. Operand 1430 states and 1884 transitions. [2022-11-22 00:21:25,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 00:21:25,587 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:21:25,587 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 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, 1, 1] [2022-11-22 00:21:25,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 00:21:25,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-22 00:21:25,788 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:21:25,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:21:25,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2022-11-22 00:21:25,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:21:25,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821810309] [2022-11-22 00:21:25,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:21:25,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:21:25,796 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:21:25,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1863822242] [2022-11-22 00:21:25,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:21:25,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:21:25,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:21:25,801 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:21:25,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 00:21:25,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:21:25,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-22 00:21:25,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:21:25,993 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:21:25,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:21:26,191 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 00:21:26,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:21:26,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821810309] [2022-11-22 00:21:26,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:21:26,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863822242] [2022-11-22 00:21:26,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863822242] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:21:26,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [230195753] [2022-11-22 00:21:26,193 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:21:26,194 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:21:26,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:21:26,194 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:21:26,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:21:31,358 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-22 00:21:31,359 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:21:33,120 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 00:21:33,124 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:21:33,145 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:21:41,899 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36806#(and (<= ~counter~0 22) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 00:21:41,899 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:21:41,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:21:41,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-22 00:21:41,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135624589] [2022-11-22 00:21:41,900 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:21:41,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 00:21:41,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:21:41,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 00:21:41,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1673, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 00:21:41,902 INFO L87 Difference]: Start difference. First operand 1430 states and 1884 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:21:44,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:21:44,409 INFO L93 Difference]: Finished difference Result 3913 states and 5424 transitions. [2022-11-22 00:21:44,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 00:21:44,412 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 68 [2022-11-22 00:21:44,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:21:44,426 INFO L225 Difference]: With dead ends: 3913 [2022-11-22 00:21:44,427 INFO L226 Difference]: Without dead ends: 3390 [2022-11-22 00:21:44,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 00:21:44,431 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 572 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 572 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:21:44,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [572 Valid, 576 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [252 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 00:21:44,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3390 states. [2022-11-22 00:21:45,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3390 to 3265. [2022-11-22 00:21:45,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2334 states have (on average 1.2609254498714653) internal successors, (2943), 2349 states have internal predecessors, (2943), 736 states have call successors, (736), 195 states have call predecessors, (736), 194 states have return successors, (726), 720 states have call predecessors, (726), 726 states have call successors, (726) [2022-11-22 00:21:45,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 4405 transitions. [2022-11-22 00:21:45,992 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 4405 transitions. Word has length 68 [2022-11-22 00:21:45,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:21:45,993 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 4405 transitions. [2022-11-22 00:21:45,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 00:21:45,993 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 4405 transitions. [2022-11-22 00:21:45,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 00:21:45,995 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:21:45,995 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 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] [2022-11-22 00:21:46,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 00:21:46,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:21:46,201 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:21:46,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:21:46,201 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2022-11-22 00:21:46,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:21:46,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116551547] [2022-11-22 00:21:46,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:21:46,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:21:46,211 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:21:46,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1672138535] [2022-11-22 00:21:46,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:21:46,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:21:46,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:21:46,225 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:21:46,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 00:21:46,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:21:46,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-22 00:21:46,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:21:47,711 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-22 00:21:47,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:21:52,778 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-11-22 00:21:52,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:21:52,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116551547] [2022-11-22 00:21:52,778 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:21:52,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1672138535] [2022-11-22 00:21:52,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1672138535] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:21:52,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970380045] [2022-11-22 00:21:52,780 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:21:52,780 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:21:52,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:21:52,781 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:21:52,781 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:22:23,349 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-22 00:22:23,388 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:22:23,410 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:22:31,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47700#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2022-11-22 00:22:31,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:22:31,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:22:31,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-22 00:22:31,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009869168] [2022-11-22 00:22:31,632 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:22:31,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 00:22:31,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:22:31,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 00:22:31,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2398, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 00:22:31,633 INFO L87 Difference]: Start difference. First operand 3265 states and 4405 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-22 00:22:40,996 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 00:22:59,795 WARN L233 SmtUtils]: Spent 5.19s on a formula simplification. DAG size of input: 102 DAG size of output: 88 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 00:23:37,451 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 [] [2022-11-22 00:24:08,314 WARN L233 SmtUtils]: Spent 7.73s on a formula simplification. DAG size of input: 108 DAG size of output: 94 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 00:24:39,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:24:39,586 INFO L93 Difference]: Finished difference Result 5368 states and 7465 transitions. [2022-11-22 00:24:39,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-22 00:24:39,587 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2022-11-22 00:24:39,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:24:39,602 INFO L225 Difference]: With dead ends: 5368 [2022-11-22 00:24:39,603 INFO L226 Difference]: Without dead ends: 5317 [2022-11-22 00:24:39,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7652 ImplicationChecksByTransitivity, 94.3s TimeCoverageRelationStatistics Valid=2799, Invalid=15833, Unknown=0, NotChecked=0, Total=18632 [2022-11-22 00:24:39,610 INFO L413 NwaCegarLoop]: 97 mSDtfsCounter, 723 mSDsluCounter, 1111 mSDsCounter, 0 mSdLazyCounter, 2834 mSolverCounterSat, 776 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 723 SdHoareTripleChecker+Valid, 1208 SdHoareTripleChecker+Invalid, 3611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 776 IncrementalHoareTripleChecker+Valid, 2834 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.5s IncrementalHoareTripleChecker+Time [2022-11-22 00:24:39,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [723 Valid, 1208 Invalid, 3611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [776 Valid, 2834 Invalid, 1 Unknown, 0 Unchecked, 40.5s Time] [2022-11-22 00:24:39,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5317 states. [2022-11-22 00:24:42,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5317 to 4128. [2022-11-22 00:24:42,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3001 states have (on average 1.279573475508164) internal successors, (3840), 3014 states have internal predecessors, (3840), 902 states have call successors, (902), 225 states have call predecessors, (902), 224 states have return successors, (892), 888 states have call predecessors, (892), 892 states have call successors, (892) [2022-11-22 00:24:42,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5634 transitions. [2022-11-22 00:24:42,939 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5634 transitions. Word has length 79 [2022-11-22 00:24:42,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:24:42,940 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5634 transitions. [2022-11-22 00:24:42,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-22 00:24:42,940 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5634 transitions. [2022-11-22 00:24:42,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-22 00:24:42,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:24:42,943 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:24:42,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-22 00:24:43,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:24:43,149 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:24:43,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:24:43,149 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2022-11-22 00:24:43,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:24:43,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047614376] [2022-11-22 00:24:43,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:24:43,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:24:43,158 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:24:43,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [958656109] [2022-11-22 00:24:43,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:24:43,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:24:43,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:24:43,164 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:24:43,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 00:24:43,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 00:24:43,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:24:43,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 00:24:43,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:24:43,468 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-22 00:24:43,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:24:43,743 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-22 00:24:43,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:24:43,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047614376] [2022-11-22 00:24:43,744 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:24:43,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958656109] [2022-11-22 00:24:43,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958656109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:24:43,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026802393] [2022-11-22 00:24:43,745 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:24:43,745 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:24:43,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:24:43,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:24:43,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:24:48,966 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:24:53,347 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-22 00:24:53,418 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:24:53,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:25:16,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62187#(and (<= 0 |#NULL.base|) (<= ~counter~0 22) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2022-11-22 00:25:16,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:25:16,268 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:25:16,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2022-11-22 00:25:16,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011323296] [2022-11-22 00:25:16,268 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:25:16,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 00:25:16,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:25:16,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 00:25:16,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=1721, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 00:25:16,270 INFO L87 Difference]: Start difference. First operand 4128 states and 5634 transitions. Second operand has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-11-22 00:25:22,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:25:22,666 INFO L93 Difference]: Finished difference Result 5419 states and 7456 transitions. [2022-11-22 00:25:22,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-22 00:25:22,667 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 89 [2022-11-22 00:25:22,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:25:22,690 INFO L225 Difference]: With dead ends: 5419 [2022-11-22 00:25:22,691 INFO L226 Difference]: Without dead ends: 5377 [2022-11-22 00:25:22,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 214 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=793, Invalid=3239, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 00:25:22,694 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 646 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 00:25:22,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [646 Valid, 574 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 00:25:22,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5377 states. [2022-11-22 00:25:27,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5377 to 5158. [2022-11-22 00:25:27,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5158 states, 3778 states have (on average 1.2501323451561672) internal successors, (4723), 3823 states have internal predecessors, (4723), 1122 states have call successors, (1122), 258 states have call predecessors, (1122), 257 states have return successors, (1110), 1076 states have call predecessors, (1110), 1110 states have call successors, (1110) [2022-11-22 00:25:27,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5158 states to 5158 states and 6955 transitions. [2022-11-22 00:25:27,309 INFO L78 Accepts]: Start accepts. Automaton has 5158 states and 6955 transitions. Word has length 89 [2022-11-22 00:25:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:25:27,309 INFO L495 AbstractCegarLoop]: Abstraction has 5158 states and 6955 transitions. [2022-11-22 00:25:27,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-11-22 00:25:27,310 INFO L276 IsEmpty]: Start isEmpty. Operand 5158 states and 6955 transitions. [2022-11-22 00:25:27,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-22 00:25:27,312 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:25:27,312 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:25:27,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 00:25:27,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 00:25:27,519 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:25:27,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:25:27,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2022-11-22 00:25:27,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:25:27,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524628159] [2022-11-22 00:25:27,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:25:27,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:25:27,528 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:25:27,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1213887255] [2022-11-22 00:25:27,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:25:27,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:25:27,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:25:27,530 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:25:27,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 00:25:27,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 00:25:27,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:25:27,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 00:25:27,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:25:27,678 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-22 00:25:27,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:25:27,775 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-22 00:25:27,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:25:27,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524628159] [2022-11-22 00:25:27,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:25:27,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213887255] [2022-11-22 00:25:27,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213887255] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:25:27,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304876365] [2022-11-22 00:25:27,778 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:25:27,778 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:25:27,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:25:27,778 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:25:27,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:25:31,709 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 00:25:35,813 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 00:25:35,817 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:25:35,840 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:25:57,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77989#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 00:25:57,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:25:57,760 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:25:57,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-22 00:25:57,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152590691] [2022-11-22 00:25:57,760 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:25:57,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 00:25:57,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:25:57,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 00:25:57,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-11-22 00:25:57,761 INFO L87 Difference]: Start difference. First operand 5158 states and 6955 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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) [2022-11-22 00:26:03,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:26:03,917 INFO L93 Difference]: Finished difference Result 6867 states and 9553 transitions. [2022-11-22 00:26:03,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 00:26:03,917 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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 90 [2022-11-22 00:26:03,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:26:03,946 INFO L225 Difference]: With dead ends: 6867 [2022-11-22 00:26:03,947 INFO L226 Difference]: Without dead ends: 6815 [2022-11-22 00:26:03,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 00:26:03,950 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 121 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:26:03,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 365 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 00:26:03,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6815 states. [2022-11-22 00:26:07,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6815 to 5044. [2022-11-22 00:26:07,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5044 states, 3629 states have (on average 1.2554422705979609) internal successors, (4556), 3680 states have internal predecessors, (4556), 1157 states have call successors, (1157), 258 states have call predecessors, (1157), 257 states have return successors, (1145), 1105 states have call predecessors, (1145), 1145 states have call successors, (1145) [2022-11-22 00:26:07,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5044 states to 5044 states and 6858 transitions. [2022-11-22 00:26:07,902 INFO L78 Accepts]: Start accepts. Automaton has 5044 states and 6858 transitions. Word has length 90 [2022-11-22 00:26:07,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:26:07,902 INFO L495 AbstractCegarLoop]: Abstraction has 5044 states and 6858 transitions. [2022-11-22 00:26:07,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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) [2022-11-22 00:26:07,903 INFO L276 IsEmpty]: Start isEmpty. Operand 5044 states and 6858 transitions. [2022-11-22 00:26:07,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-22 00:26:07,905 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:26:07,905 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 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] [2022-11-22 00:26:07,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 00:26:08,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-22 00:26:08,111 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:26:08,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:26:08,112 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2022-11-22 00:26:08,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:26:08,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341329295] [2022-11-22 00:26:08,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:26:08,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:26:08,121 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:26:08,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1538456502] [2022-11-22 00:26:08,121 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 00:26:08,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:26:08,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:26:08,125 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:26:08,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 00:26:08,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 00:26:08,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 00:26:08,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-22 00:26:08,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:26:09,619 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-11-22 00:26:09,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:26:12,165 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-22 00:26:12,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:26:12,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341329295] [2022-11-22 00:26:12,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:26:12,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538456502] [2022-11-22 00:26:12,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538456502] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:26:12,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679785080] [2022-11-22 00:26:12,167 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 00:26:12,167 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:26:12,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:26:12,168 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:26:12,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 00:26:40,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-22 00:26:40,667 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 00:26:40,708 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 00:26:46,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95929#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2022-11-22 00:26:46,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 00:26:46,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 00:26:46,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-22 00:26:46,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330262800] [2022-11-22 00:26:46,095 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 00:26:46,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 00:26:46,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 00:26:46,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 00:26:46,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2198, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 00:26:46,097 INFO L87 Difference]: Start difference. First operand 5044 states and 6858 transitions. Second operand has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-22 00:27:23,337 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 00:27:56,142 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 00:28:13,872 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 00:28:14,898 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 [] [2022-11-22 00:28:29,445 WARN L233 SmtUtils]: Spent 5.09s on a formula simplification that was a NOOP. DAG size: 80 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 00:28:43,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 00:28:43,100 INFO L93 Difference]: Finished difference Result 8643 states and 11839 transitions. [2022-11-22 00:28:43,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-22 00:28:43,101 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 99 [2022-11-22 00:28:43,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 00:28:43,122 INFO L225 Difference]: With dead ends: 8643 [2022-11-22 00:28:43,122 INFO L226 Difference]: Without dead ends: 6117 [2022-11-22 00:28:43,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 222 SyntacticMatches, 25 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6640 ImplicationChecksByTransitivity, 83.8s TimeCoverageRelationStatistics Valid=2410, Invalid=14360, Unknown=0, NotChecked=0, Total=16770 [2022-11-22 00:28:43,132 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 504 mSDsluCounter, 1063 mSDsCounter, 0 mSdLazyCounter, 2375 mSolverCounterSat, 552 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 1189 SdHoareTripleChecker+Invalid, 2929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 552 IncrementalHoareTripleChecker+Valid, 2375 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.4s IncrementalHoareTripleChecker+Time [2022-11-22 00:28:43,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [504 Valid, 1189 Invalid, 2929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [552 Valid, 2375 Invalid, 2 Unknown, 0 Unchecked, 34.4s Time] [2022-11-22 00:28:43,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6117 states. [2022-11-22 00:28:47,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6117 to 5344. [2022-11-22 00:28:47,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5344 states, 3807 states have (on average 1.2545311268715524) internal successors, (4776), 3861 states have internal predecessors, (4776), 1256 states have call successors, (1256), 280 states have call predecessors, (1256), 280 states have return successors, (1245), 1202 states have call predecessors, (1245), 1245 states have call successors, (1245) [2022-11-22 00:28:47,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5344 states to 5344 states and 7277 transitions. [2022-11-22 00:28:47,836 INFO L78 Accepts]: Start accepts. Automaton has 5344 states and 7277 transitions. Word has length 99 [2022-11-22 00:28:47,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 00:28:47,837 INFO L495 AbstractCegarLoop]: Abstraction has 5344 states and 7277 transitions. [2022-11-22 00:28:47,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-22 00:28:47,837 INFO L276 IsEmpty]: Start isEmpty. Operand 5344 states and 7277 transitions. [2022-11-22 00:28:47,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-22 00:28:47,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 00:28:47,840 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 00:28:47,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-22 00:28:48,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:28:48,049 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 00:28:48,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 00:28:48,050 INFO L85 PathProgramCache]: Analyzing trace with hash -90675194, now seen corresponding path program 1 times [2022-11-22 00:28:48,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 00:28:48,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749179868] [2022-11-22 00:28:48,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:28:48,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 00:28:48,060 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 00:28:48,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [980301116] [2022-11-22 00:28:48,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 00:28:48,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 00:28:48,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 [2022-11-22 00:28:48,066 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 00:28:48,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b0d5853-02eb-4cb4-a03d-3a0737bfafea/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 00:28:48,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 00:28:48,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-22 00:28:48,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 00:28:48,509 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 47 proven. 34 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2022-11-22 00:28:48,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 00:28:49,331 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 63 proven. 17 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2022-11-22 00:28:49,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 00:28:49,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749179868] [2022-11-22 00:28:49,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 00:28:49,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980301116] [2022-11-22 00:28:49,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980301116] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 00:28:49,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2039169165] [2022-11-22 00:28:49,333 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 00:28:49,333 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 00:28:49,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 00:28:49,334 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 00:28:49,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs