./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P --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 ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:19:30,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:19:30,949 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:19:31,002 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:19:31,003 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:19:31,007 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:19:31,009 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:19:31,013 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:19:31,016 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:19:31,022 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:19:31,023 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:19:31,025 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:19:31,026 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:19:31,028 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:19:31,031 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:19:31,035 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:19:31,037 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:19:31,038 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:19:31,040 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:19:31,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:19:31,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:19:31,052 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:19:31,055 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:19:31,056 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:19:31,065 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:19:31,065 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:19:31,066 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:19:31,068 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:19:31,068 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:19:31,070 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:19:31,070 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:19:31,071 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:19:31,073 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:19:31,074 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:19:31,076 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:19:31,076 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:19:31,077 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:19:31,077 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:19:31,077 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:19:31,078 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:19:31,079 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:19:31,080 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:19:31,121 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:19:31,122 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:19:31,123 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:19:31,123 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:19:31,124 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:19:31,125 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:19:31,125 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:19:31,125 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:19:31,125 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:19:31,125 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:19:31,126 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:19:31,127 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:19:31,127 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:19:31,127 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:19:31,127 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:19:31,127 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:19:31,128 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:19:31,128 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:19:31,129 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:19:31,129 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:19:31,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:19:31,130 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:19:31,130 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:19:31,130 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:19:31,130 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:19:31,131 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:19:31,132 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:19:31,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:19:31,132 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:19:31,133 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:19:31,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:19:31,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:19:31,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:19:31,134 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:19:31,134 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:19:31,134 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:19:31,134 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:19:31,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:19:31,134 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:19:31,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:19:31,135 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:19:31,135 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 [2021-11-21 01:19:31,415 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:19:31,437 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:19:31,440 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:19:31,441 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:19:31,442 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:19:31,443 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2021-11-21 01:19:31,544 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/data/334945d21/33e7e5b769c74a1d8adaca97bf817cab/FLAGaa3e9b6f0 [2021-11-21 01:19:31,942 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:19:31,943 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2021-11-21 01:19:31,973 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/data/334945d21/33e7e5b769c74a1d8adaca97bf817cab/FLAGaa3e9b6f0 [2021-11-21 01:19:32,338 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/data/334945d21/33e7e5b769c74a1d8adaca97bf817cab [2021-11-21 01:19:32,343 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:19:32,345 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:19:32,350 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:19:32,350 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:19:32,353 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:19:32,354 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dca1066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32, skipping insertion in model container [2021-11-21 01:19:32,357 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,364 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:19:32,383 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:19:32,571 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2021-11-21 01:19:32,591 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:19:32,599 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:19:32,611 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2021-11-21 01:19:32,622 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:19:32,649 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:19:32,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32 WrapperNode [2021-11-21 01:19:32,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:19:32,651 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:19:32,651 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:19:32,651 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:19:32,660 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,676 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,706 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-21 01:19:32,706 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:19:32,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:19:32,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:19:32,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:19:32,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,730 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,730 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,749 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,756 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,758 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:19:32,765 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:19:32,767 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:19:32,768 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:19:32,768 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (1/1) ... [2021-11-21 01:19:32,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:19:32,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:32,800 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:19:32,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:19:32,842 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:19:32,843 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:19:32,843 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:19:32,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:19:32,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:19:32,844 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:19:32,844 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:19:32,844 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:19:32,914 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:19:32,916 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:19:33,103 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:19:33,137 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:19:33,140 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:19:33,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:19:33 BoogieIcfgContainer [2021-11-21 01:19:33,143 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:19:33,146 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:19:33,146 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:19:33,150 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:19:33,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:19:32" (1/3) ... [2021-11-21 01:19:33,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c6af6a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:19:33, skipping insertion in model container [2021-11-21 01:19:33,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:19:32" (2/3) ... [2021-11-21 01:19:33,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c6af6a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:19:33, skipping insertion in model container [2021-11-21 01:19:33,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:19:33" (3/3) ... [2021-11-21 01:19:33,154 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound5.c [2021-11-21 01:19:33,159 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:19:33,160 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:19:33,219 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:19:33,230 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:19:33,231 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:19:33,252 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:19:33,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:19:33,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:33,260 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:33,261 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:33,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:33,266 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-21 01:19:33,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:33,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125705680] [2021-11-21 01:19:33,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:33,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:33,367 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:33,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1987775709] [2021-11-21 01:19:33,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:33,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:33,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:33,370 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:33,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:19:33,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:33,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-21 01:19:33,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:33,641 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:19:33,643 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:33,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:33,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125705680] [2021-11-21 01:19:33,644 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:33,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987775709] [2021-11-21 01:19:33,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987775709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:33,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:33,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:19:33,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142119262] [2021-11-21 01:19:33,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:33,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:19:33,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:33,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:19:33,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:19:33,695 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (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) [2021-11-21 01:19:33,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:33,746 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-21 01:19:33,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:19:33,749 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (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 26 [2021-11-21 01:19:33,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:33,757 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:19:33,757 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:19:33,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:19:33,765 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:33,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:19:33,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:19:33,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 01:19:33,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:19:33,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-21 01:19:33,807 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-21 01:19:33,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:33,808 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-21 01:19:33,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (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) [2021-11-21 01:19:33,809 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-21 01:19:33,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:19:33,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:33,811 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:33,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:34,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-21 01:19:34,025 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:34,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:34,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-21 01:19:34,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:34,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349783540] [2021-11-21 01:19:34,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:34,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:34,044 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:34,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1760507026] [2021-11-21 01:19:34,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:34,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:34,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:34,046 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:34,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:19:34,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:34,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:19:34,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:34,290 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:19:34,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:34,415 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:19:34,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:34,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349783540] [2021-11-21 01:19:34,416 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:34,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760507026] [2021-11-21 01:19:34,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760507026] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:34,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897207150] [2021-11-21 01:19:34,437 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-21 01:19:34,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:34,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:34,453 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:34,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:19:37,580 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:19:37,599 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:19:38,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1897207150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:38,100 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:19:38,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-21 01:19:38,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154210933] [2021-11-21 01:19:38,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:38,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:19:38,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:38,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:19:38,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:19:38,103 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:19:38,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:38,298 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-21 01:19:38,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:19:38,299 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-21 01:19:38,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:38,300 INFO L225 Difference]: With dead ends: 38 [2021-11-21 01:19:38,300 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 01:19:38,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:19:38,302 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 39 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:38,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 53 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:19:38,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 01:19:38,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-21 01:19:38,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:19:38,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-21 01:19:38,314 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-21 01:19:38,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:38,315 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-21 01:19:38,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-21 01:19:38,315 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-21 01:19:38,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:19:38,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:38,316 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:38,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:38,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:38,541 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:38,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:38,542 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-21 01:19:38,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:38,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091565975] [2021-11-21 01:19:38,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:38,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:38,564 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:38,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [731400885] [2021-11-21 01:19:38,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:38,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:38,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:38,571 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:38,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:19:38,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:38,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:19:38,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:38,763 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:19:38,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:38,860 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:19:38,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:38,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091565975] [2021-11-21 01:19:38,860 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:38,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731400885] [2021-11-21 01:19:38,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731400885] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:38,861 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:38,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:19:38,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382652098] [2021-11-21 01:19:38,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:38,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:19:38,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:38,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:19:38,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:19:38,863 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-21 01:19:39,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:39,036 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-21 01:19:39,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:19:39,037 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 28 [2021-11-21 01:19:39,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:39,038 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:19:39,038 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 01:19:39,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:19:39,040 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:39,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:19:39,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 01:19:39,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-21 01:19:39,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-21 01:19:39,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-21 01:19:39,052 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-21 01:19:39,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:39,052 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-21 01:19:39,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-21 01:19:39,053 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-21 01:19:39,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 01:19:39,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:39,054 INFO L514 BasicCegarLoop]: trace histogram [6, 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] [2021-11-21 01:19:39,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:39,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:39,273 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:39,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:39,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-21 01:19:39,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:39,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243750482] [2021-11-21 01:19:39,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:39,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:39,286 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:39,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1546266903] [2021-11-21 01:19:39,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:39,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:39,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:39,306 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:39,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:19:39,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:39,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:19:39,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:39,600 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:19:39,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:39,787 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:19:39,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:39,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243750482] [2021-11-21 01:19:39,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:39,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546266903] [2021-11-21 01:19:39,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546266903] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:39,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:39,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:19:39,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827914228] [2021-11-21 01:19:39,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:39,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:19:39,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:39,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:19:39,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:19:39,790 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:39,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:39,875 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-21 01:19:39,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:19:39,876 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2021-11-21 01:19:39,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:39,877 INFO L225 Difference]: With dead ends: 47 [2021-11-21 01:19:39,877 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:19:39,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:19:39,879 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:39,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:19:39,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:19:39,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-21 01:19:39,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-21 01:19:39,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-21 01:19:39,898 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-21 01:19:39,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:39,899 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-21 01:19:39,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:39,900 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-21 01:19:39,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 01:19:39,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:39,902 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:39,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:40,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:40,117 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:40,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:40,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-21 01:19:40,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:40,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717786576] [2021-11-21 01:19:40,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:40,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:40,130 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:40,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [726549989] [2021-11-21 01:19:40,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:40,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:40,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:40,132 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:40,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:19:40,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:40,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:19:40,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-21 01:19:40,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:40,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:40,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717786576] [2021-11-21 01:19:40,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:40,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726549989] [2021-11-21 01:19:40,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726549989] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:40,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471574414] [2021-11-21 01:19:40,450 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-21 01:19:40,450 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:40,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:40,452 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:40,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:19:44,316 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-21 01:19:44,423 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:19:44,435 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:19:45,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1471574414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:45,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:45,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-21 01:19:45,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569431983] [2021-11-21 01:19:45,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:45,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:19:45,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:45,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:19:45,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:19:45,204 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:19:45,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:45,598 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-21 01:19:45,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:19:45,599 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2021-11-21 01:19:45,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:45,600 INFO L225 Difference]: With dead ends: 65 [2021-11-21 01:19:45,601 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 01:19:45,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-21 01:19:45,602 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 37 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:45,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 59 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:45,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 01:19:45,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-21 01:19:45,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-21 01:19:45,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-21 01:19:45,619 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-21 01:19:45,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:45,620 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-21 01:19:45,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-21 01:19:45,620 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-21 01:19:45,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:19:45,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:45,622 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:45,659 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 01:19:45,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:45,837 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:45,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:45,837 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-21 01:19:45,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:45,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106408462] [2021-11-21 01:19:45,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:45,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:45,845 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:19:45,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [341636191] [2021-11-21 01:19:45,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:45,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:45,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:45,847 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:45,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:19:45,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:45,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:19:45,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:46,031 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:19:46,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:46,204 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-21 01:19:46,204 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:46,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106408462] [2021-11-21 01:19:46,204 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:19:46,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341636191] [2021-11-21 01:19:46,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341636191] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:46,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301716715] [2021-11-21 01:19:46,208 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:19:46,208 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:46,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:46,209 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:46,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:33,171 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-21 01:20:33,288 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:20:33,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:20:35,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1301716715] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:20:35,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:20:35,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 7] total 21 [2021-11-21 01:20:35,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359217154] [2021-11-21 01:20:35,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:20:35,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:20:35,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:20:35,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:20:35,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:20:35,158 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:20:35,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:20:35,792 INFO L93 Difference]: Finished difference Result 87 states and 108 transitions. [2021-11-21 01:20:35,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:20:35,796 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 52 [2021-11-21 01:20:35,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:20:35,797 INFO L225 Difference]: With dead ends: 87 [2021-11-21 01:20:35,798 INFO L226 Difference]: Without dead ends: 79 [2021-11-21 01:20:35,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:20:35,799 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:20:35,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 69 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:20:35,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-21 01:20:35,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-21 01:20:35,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 46 states have internal predecessors, (51), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-21 01:20:35,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-11-21 01:20:35,820 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 52 [2021-11-21 01:20:35,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:20:35,821 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-11-21 01:20:35,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 7 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-21 01:20:35,821 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-11-21 01:20:35,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-21 01:20:35,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:20:35,823 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:20:35,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:20:36,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:20:36,049 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:20:36,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:20:36,050 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-21 01:20:36,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:20:36,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428162693] [2021-11-21 01:20:36,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:36,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:20:36,060 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:20:36,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [398547782] [2021-11-21 01:20:36,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:36,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:36,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:20:36,067 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:20:36,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:20:36,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:20:36,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:20:36,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:36,237 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:20:36,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:36,383 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-21 01:20:36,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:20:36,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428162693] [2021-11-21 01:20:36,384 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:20:36,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398547782] [2021-11-21 01:20:36,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398547782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:20:36,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873574569] [2021-11-21 01:20:36,388 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:20:36,388 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:20:36,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:20:36,389 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:20:36,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:52,242 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-21 01:20:52,366 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:20:52,378 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:20:53,124 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:20:53,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:20:53,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 01:20:53,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430281043] [2021-11-21 01:20:53,125 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:20:53,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:20:53,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:20:53,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:20:53,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:20:53,127 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:20:53,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:20:53,279 INFO L93 Difference]: Finished difference Result 93 states and 113 transitions. [2021-11-21 01:20:53,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:20:53,280 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 60 [2021-11-21 01:20:53,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:20:53,282 INFO L225 Difference]: With dead ends: 93 [2021-11-21 01:20:53,283 INFO L226 Difference]: Without dead ends: 91 [2021-11-21 01:20:53,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:20:53,284 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:20:53,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:20:53,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-21 01:20:53,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-21 01:20:53,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 27 states have call successors, (27), 11 states have call predecessors, (27), 11 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-21 01:20:53,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 111 transitions. [2021-11-21 01:20:53,306 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 111 transitions. Word has length 60 [2021-11-21 01:20:53,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:20:53,306 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 111 transitions. [2021-11-21 01:20:53,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:20:53,307 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 111 transitions. [2021-11-21 01:20:53,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 01:20:53,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:20:53,309 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 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, 1] [2021-11-21 01:20:53,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:20:53,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:53,537 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:20:53,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:20:53,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-21 01:20:53,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:20:53,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012137022] [2021-11-21 01:20:53,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:20:53,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:20:53,547 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:20:53,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [151160975] [2021-11-21 01:20:53,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:20:53,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:20:53,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:20:53,552 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:20:53,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:20:53,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:20:53,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:20:53,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:20:53,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:20:53,765 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 01:20:53,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:20:53,931 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-21 01:20:53,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:20:53,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012137022] [2021-11-21 01:20:53,932 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:20:53,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151160975] [2021-11-21 01:20:53,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151160975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:20:53,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745265292] [2021-11-21 01:20:53,935 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:20:53,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:20:53,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:20:53,935 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:20:53,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:21:07,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-21 01:21:07,990 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:21:08,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:21:08,844 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:21:08,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:21:08,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-21 01:21:08,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196060667] [2021-11-21 01:21:08,845 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:21:08,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:21:08,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:21:08,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:21:08,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:21:08,846 INFO L87 Difference]: Start difference. First operand 91 states and 111 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 01:21:09,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:21:09,104 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2021-11-21 01:21:09,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:21:09,104 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2021-11-21 01:21:09,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:21:09,106 INFO L225 Difference]: With dead ends: 98 [2021-11-21 01:21:09,106 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 01:21:09,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:21:09,108 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:21:09,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 151 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:21:09,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 01:21:09,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-21 01:21:09,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 57 states have internal predecessors, (61), 28 states have call successors, (28), 12 states have call predecessors, (28), 12 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-21 01:21:09,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 116 transitions. [2021-11-21 01:21:09,131 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 116 transitions. Word has length 65 [2021-11-21 01:21:09,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:21:09,131 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 116 transitions. [2021-11-21 01:21:09,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-21 01:21:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 116 transitions. [2021-11-21 01:21:09,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:21:09,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:21:09,134 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:21:09,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:21:09,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:09,341 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:21:09,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:21:09,342 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-21 01:21:09,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:21:09,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4086038] [2021-11-21 01:21:09,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:09,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:21:09,350 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:21:09,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [274849741] [2021-11-21 01:21:09,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:09,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:09,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:21:09,352 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:21:09,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:21:09,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:21:09,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 01:21:09,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:21:09,947 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 01:21:09,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:21:10,873 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 01:21:10,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:21:10,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4086038] [2021-11-21 01:21:10,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:21:10,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274849741] [2021-11-21 01:21:10,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274849741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:21:10,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738184039] [2021-11-21 01:21:10,877 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:21:10,877 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:21:10,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:21:10,878 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:21:10,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:21:41,840 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:21:41,925 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:21:41,939 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:21:49,509 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:21:49,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:21:49,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-21 01:21:49,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114543037] [2021-11-21 01:21:49,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:21:49,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:21:49,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:21:49,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:21:49,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1236, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:21:49,512 INFO L87 Difference]: Start difference. First operand 96 states and 116 transitions. Second operand has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 01:21:56,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:21:56,503 INFO L93 Difference]: Finished difference Result 170 states and 227 transitions. [2021-11-21 01:21:56,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:21:56,504 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 74 [2021-11-21 01:21:56,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:21:56,506 INFO L225 Difference]: With dead ends: 170 [2021-11-21 01:21:56,506 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 01:21:56,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 180 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 875 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=404, Invalid=2788, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:21:56,509 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 64 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:21:56,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 456 Invalid, 667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-21 01:21:56,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 01:21:56,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 158. [2021-11-21 01:21:56,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 85 states have (on average 1.188235294117647) internal successors, (101), 87 states have internal predecessors, (101), 57 states have call successors, (57), 15 states have call predecessors, (57), 15 states have return successors, (56), 55 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 01:21:56,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 214 transitions. [2021-11-21 01:21:56,553 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 214 transitions. Word has length 74 [2021-11-21 01:21:56,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:21:56,554 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 214 transitions. [2021-11-21 01:21:56,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 01:21:56,554 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 214 transitions. [2021-11-21 01:21:56,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 01:21:56,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:21:56,557 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:21:56,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-21 01:21:56,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:56,781 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:21:56,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:21:56,781 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-21 01:21:56,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:21:56,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047703642] [2021-11-21 01:21:56,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:56,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:21:56,790 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:21:56,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1976983006] [2021-11-21 01:21:56,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:21:56,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:21:56,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:21:56,792 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:21:56,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:21:56,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:21:56,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 01:21:56,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:21:57,192 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-21 01:21:57,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:21:57,434 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-21 01:21:57,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:21:57,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047703642] [2021-11-21 01:21:57,435 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:21:57,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976983006] [2021-11-21 01:21:57,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976983006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:21:57,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [246318707] [2021-11-21 01:21:57,437 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-21 01:21:57,438 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:21:57,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:21:57,438 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:21:57,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:22:06,960 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:22:07,021 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:22:07,032 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:22:12,234 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:22:12,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:22:12,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-21 01:22:12,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040159421] [2021-11-21 01:22:12,234 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:22:12,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:22:12,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:22:12,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:22:12,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:22:12,236 INFO L87 Difference]: Start difference. First operand 158 states and 214 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 01:22:13,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:22:13,601 INFO L93 Difference]: Finished difference Result 191 states and 251 transitions. [2021-11-21 01:22:13,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:22:13,601 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 79 [2021-11-21 01:22:13,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:22:13,603 INFO L225 Difference]: With dead ends: 191 [2021-11-21 01:22:13,604 INFO L226 Difference]: Without dead ends: 185 [2021-11-21 01:22:13,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 199 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:22:13,606 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 37 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:22:13,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 277 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:22:13,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-21 01:22:13,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 165. [2021-11-21 01:22:13,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 97 states have (on average 1.1237113402061856) internal successors, (109), 101 states have internal predecessors, (109), 50 states have call successors, (50), 17 states have call predecessors, (50), 17 states have return successors, (49), 46 states have call predecessors, (49), 49 states have call successors, (49) [2021-11-21 01:22:13,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 208 transitions. [2021-11-21 01:22:13,643 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 208 transitions. Word has length 79 [2021-11-21 01:22:13,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:22:13,643 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 208 transitions. [2021-11-21 01:22:13,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-21 01:22:13,644 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 208 transitions. [2021-11-21 01:22:13,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-21 01:22:13,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:22:13,646 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:22:13,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:22:13,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:22:13,848 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:22:13,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:22:13,848 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-21 01:22:13,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:22:13,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951303530] [2021-11-21 01:22:13,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:22:13,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:22:13,858 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:22:13,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [119054606] [2021-11-21 01:22:13,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:22:13,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:22:13,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:22:13,860 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:22:13,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:22:13,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:22:13,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 01:22:13,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:22:14,893 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-21 01:22:14,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:22:20,304 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:22:20,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951303530] [2021-11-21 01:22:20,304 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:22:20,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119054606] [2021-11-21 01:22:20,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119054606] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:22:20,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872647313] [2021-11-21 01:22:20,307 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:22:20,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:22:20,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:22:20,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:22:20,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:22:26,287 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:26,288 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:27,510 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:27,510 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:31,252 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:31,253 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:34,397 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:34,397 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:22:43,254 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:22:43,322 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:22:43,334 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:22:55,749 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:22:55,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:22:55,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-21 01:22:55,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243951678] [2021-11-21 01:22:55,750 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:22:55,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:22:55,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:22:55,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:22:55,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1166, Unknown=5, NotChecked=0, Total=1332 [2021-11-21 01:22:55,751 INFO L87 Difference]: Start difference. First operand 165 states and 208 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 01:22:56,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:22:56,401 INFO L93 Difference]: Finished difference Result 195 states and 247 transitions. [2021-11-21 01:22:56,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:22:56,402 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2021-11-21 01:22:56,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:22:56,404 INFO L225 Difference]: With dead ends: 195 [2021-11-21 01:22:56,404 INFO L226 Difference]: Without dead ends: 193 [2021-11-21 01:22:56,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 180 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=185, Invalid=1370, Unknown=5, NotChecked=0, Total=1560 [2021-11-21 01:22:56,406 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 19 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:22:56,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 291 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:22:56,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-21 01:22:56,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 191. [2021-11-21 01:22:56,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 111 states have (on average 1.135135135135135) internal successors, (126), 114 states have internal predecessors, (126), 59 states have call successors, (59), 20 states have call predecessors, (59), 20 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-21 01:22:56,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 243 transitions. [2021-11-21 01:22:56,457 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 243 transitions. Word has length 90 [2021-11-21 01:22:56,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:22:56,457 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 243 transitions. [2021-11-21 01:22:56,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-21 01:22:56,458 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 243 transitions. [2021-11-21 01:22:56,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 01:22:56,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:22:56,460 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:22:56,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:22:56,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:22:56,668 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:22:56,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:22:56,669 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-21 01:22:56,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:22:56,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057754180] [2021-11-21 01:22:56,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:22:56,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:22:56,693 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:22:56,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1553704049] [2021-11-21 01:22:56,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:22:56,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:22:56,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:22:56,695 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:22:56,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:22:56,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:22:56,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:22:56,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:22:56,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:22:56,903 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-21 01:22:56,903 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:22:56,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:22:56,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057754180] [2021-11-21 01:22:56,903 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:22:56,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553704049] [2021-11-21 01:22:56,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553704049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:22:56,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:22:56,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:22:56,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820016246] [2021-11-21 01:22:56,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:22:56,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:22:56,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:22:56,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:22:56,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:22:56,905 INFO L87 Difference]: Start difference. First operand 191 states and 243 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 01:22:57,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:22:57,007 INFO L93 Difference]: Finished difference Result 249 states and 313 transitions. [2021-11-21 01:22:57,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:22:57,018 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-21 01:22:57,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:22:57,020 INFO L225 Difference]: With dead ends: 249 [2021-11-21 01:22:57,021 INFO L226 Difference]: Without dead ends: 185 [2021-11-21 01:22:57,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:22:57,022 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:22:57,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:22:57,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-21 01:22:57,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-11-21 01:22:57,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 106 states have (on average 1.1132075471698113) internal successors, (118), 109 states have internal predecessors, (118), 57 states have call successors, (57), 20 states have call predecessors, (57), 20 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 01:22:57,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-21 01:22:57,061 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-21 01:22:57,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:22:57,062 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-21 01:22:57,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 01:22:57,063 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-21 01:22:57,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-21 01:22:57,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:22:57,065 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:22:57,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:22:57,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:22:57,292 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:22:57,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:22:57,293 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-21 01:22:57,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:22:57,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58369340] [2021-11-21 01:22:57,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:22:57,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:22:57,303 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:22:57,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918649796] [2021-11-21 01:22:57,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:22:57,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:22:57,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:22:57,305 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:22:57,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:22:57,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:22:57,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:22:57,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:22:57,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:22:57,681 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-21 01:22:57,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:22:57,952 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-21 01:22:57,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:22:57,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58369340] [2021-11-21 01:22:57,953 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:22:57,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918649796] [2021-11-21 01:22:57,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918649796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:22:57,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217917107] [2021-11-21 01:22:57,958 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:22:57,958 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:22:57,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:22:57,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:22:57,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:23:08,439 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:23:08,508 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:23:08,520 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:23:13,114 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:23:13,114 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:23:13,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-21 01:23:13,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310612833] [2021-11-21 01:23:13,115 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:23:13,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:23:13,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:23:13,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:23:13,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:23:13,117 INFO L87 Difference]: Start difference. First operand 184 states and 231 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-21 01:23:14,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:23:14,186 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-21 01:23:14,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:23:14,186 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 105 [2021-11-21 01:23:14,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:23:14,188 INFO L225 Difference]: With dead ends: 230 [2021-11-21 01:23:14,188 INFO L226 Difference]: Without dead ends: 228 [2021-11-21 01:23:14,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 275 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=205, Invalid=1601, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 01:23:14,190 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 38 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:23:14,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 311 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:23:14,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-21 01:23:14,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-21 01:23:14,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 109 states have (on average 1.110091743119266) internal successors, (121), 112 states have internal predecessors, (121), 57 states have call successors, (57), 21 states have call predecessors, (57), 21 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-21 01:23:14,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-21 01:23:14,229 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-21 01:23:14,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:23:14,230 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-21 01:23:14,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-21 01:23:14,231 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-21 01:23:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-21 01:23:14,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:23:14,233 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:23:14,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:23:14,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:23:14,461 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:23:14,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:23:14,461 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-21 01:23:14,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:23:14,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038272303] [2021-11-21 01:23:14,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:23:14,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:23:14,485 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:23:14,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1241039871] [2021-11-21 01:23:14,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:23:14,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:14,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:23:14,487 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:23:14,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:23:14,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:23:14,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:23:14,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 01:23:14,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:23:15,204 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 59 proven. 73 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-21 01:23:15,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:23:15,444 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:23:15,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038272303] [2021-11-21 01:23:15,445 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:23:15,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241039871] [2021-11-21 01:23:15,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241039871] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:23:15,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704348162] [2021-11-21 01:23:15,447 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:23:15,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:23:15,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:23:15,447 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:23:15,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:23:31,006 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:23:31,066 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:23:31,077 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:23:38,261 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:23:38,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:23:38,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-21 01:23:38,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641184976] [2021-11-21 01:23:38,261 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:23:38,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:23:38,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:23:38,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:23:38,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1110, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:23:38,263 INFO L87 Difference]: Start difference. First operand 188 states and 234 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2021-11-21 01:23:38,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:23:38,698 INFO L93 Difference]: Finished difference Result 221 states and 279 transitions. [2021-11-21 01:23:38,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:23:38,698 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) Word has length 107 [2021-11-21 01:23:38,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:23:38,700 INFO L225 Difference]: With dead ends: 221 [2021-11-21 01:23:38,700 INFO L226 Difference]: Without dead ends: 219 [2021-11-21 01:23:38,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 210 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:23:38,702 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 25 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:23:38,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 243 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:23:38,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-21 01:23:38,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 199. [2021-11-21 01:23:38,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 116 states have (on average 1.103448275862069) internal successors, (128), 120 states have internal predecessors, (128), 60 states have call successors, (60), 22 states have call predecessors, (60), 22 states have return successors, (59), 56 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-21 01:23:38,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 247 transitions. [2021-11-21 01:23:38,748 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 247 transitions. Word has length 107 [2021-11-21 01:23:38,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:23:38,748 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 247 transitions. [2021-11-21 01:23:38,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 6 states have call predecessors, (20), 7 states have call successors, (20) [2021-11-21 01:23:38,749 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 247 transitions. [2021-11-21 01:23:38,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-21 01:23:38,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:23:38,751 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:23:38,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:23:38,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:23:38,972 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:23:38,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:23:38,972 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 4 times [2021-11-21 01:23:38,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:23:38,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738697901] [2021-11-21 01:23:38,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:23:38,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:23:38,981 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:23:38,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [940590627] [2021-11-21 01:23:38,981 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:23:38,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:23:38,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:23:38,983 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:23:38,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:23:39,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:23:39,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-21 01:23:39,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:23:39,909 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 90 proven. 95 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-21 01:23:39,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:23:40,488 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 120 proven. 32 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-21 01:23:40,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:23:40,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738697901] [2021-11-21 01:23:40,489 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:23:40,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940590627] [2021-11-21 01:23:40,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940590627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:23:40,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875946316] [2021-11-21 01:23:40,491 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:23:40,491 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:23:40,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:23:40,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:23:40,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:23:46,654 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:46,655 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:47,900 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:47,901 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:50,832 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:50,833 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:54,081 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:23:54,081 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:24:23,672 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:24:23,768 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:24:23,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:24:30,552 WARN L227 SmtUtils]: Spent 5.53s on a formula simplification. DAG size of input: 114 DAG size of output: 97 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:24:38,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:24:38,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:24:38,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 21 [2021-11-21 01:24:38,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256206618] [2021-11-21 01:24:38,188 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:24:38,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 01:24:38,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:24:38,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 01:24:38,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1527, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:24:38,191 INFO L87 Difference]: Start difference. First operand 199 states and 247 transitions. Second operand has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-21 01:24:41,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:24:41,218 INFO L93 Difference]: Finished difference Result 254 states and 322 transitions. [2021-11-21 01:24:41,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:24:41,219 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) Word has length 110 [2021-11-21 01:24:41,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:24:41,221 INFO L225 Difference]: With dead ends: 254 [2021-11-21 01:24:41,221 INFO L226 Difference]: Without dead ends: 252 [2021-11-21 01:24:41,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 283 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=282, Invalid=2268, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 01:24:41,224 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 46 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:24:41,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 418 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 608 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 01:24:41,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-21 01:24:41,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 217. [2021-11-21 01:24:41,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 126 states have (on average 1.1111111111111112) internal successors, (140), 128 states have internal predecessors, (140), 65 states have call successors, (65), 25 states have call predecessors, (65), 25 states have return successors, (64), 63 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-21 01:24:41,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 269 transitions. [2021-11-21 01:24:41,284 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 269 transitions. Word has length 110 [2021-11-21 01:24:41,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:24:41,285 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 269 transitions. [2021-11-21 01:24:41,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-21 01:24:41,286 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 269 transitions. [2021-11-21 01:24:41,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-21 01:24:41,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:24:41,288 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:24:41,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:24:41,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:24:41,501 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:24:41,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:24:41,501 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 5 times [2021-11-21 01:24:41,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:24:41,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007309888] [2021-11-21 01:24:41,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:24:41,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:24:41,517 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:24:41,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [392082461] [2021-11-21 01:24:41,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:24:41,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:24:41,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:24:41,519 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:24:41,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:24:41,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:24:41,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:24:41,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 01:24:41,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:24:44,210 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 123 proven. 55 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-21 01:24:44,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:25:02,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:25:02,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007309888] [2021-11-21 01:25:02,275 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:25:02,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392082461] [2021-11-21 01:25:02,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392082461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:25:02,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560054732] [2021-11-21 01:25:02,278 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:25:02,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:25:02,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:25:02,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:25:02,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:25:13,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:25:13,529 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:25:13,540 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:25:33,054 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:25:33,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:25:33,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-21 01:25:33,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041868643] [2021-11-21 01:25:33,054 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:25:33,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-21 01:25:33,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:25:33,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-21 01:25:33,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1808, Unknown=5, NotChecked=0, Total=2070 [2021-11-21 01:25:33,056 INFO L87 Difference]: Start difference. First operand 217 states and 269 transitions. Second operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-21 01:25:34,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:25:34,922 INFO L93 Difference]: Finished difference Result 258 states and 320 transitions. [2021-11-21 01:25:34,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:25:34,923 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) Word has length 112 [2021-11-21 01:25:34,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:25:34,925 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:25:34,926 INFO L226 Difference]: Without dead ends: 256 [2021-11-21 01:25:34,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 220 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 29.2s TimeCoverageRelationStatistics Valid=326, Invalid=2321, Unknown=5, NotChecked=0, Total=2652 [2021-11-21 01:25:34,928 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 41 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:25:34,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 343 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 01:25:34,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-21 01:25:35,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 228. [2021-11-21 01:25:35,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 133 states have (on average 1.105263157894737) internal successors, (147), 136 states have internal predecessors, (147), 68 states have call successors, (68), 26 states have call predecessors, (68), 26 states have return successors, (67), 65 states have call predecessors, (67), 67 states have call successors, (67) [2021-11-21 01:25:35,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 282 transitions. [2021-11-21 01:25:35,010 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 282 transitions. Word has length 112 [2021-11-21 01:25:35,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:25:35,010 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 282 transitions. [2021-11-21 01:25:35,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-21 01:25:35,011 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 282 transitions. [2021-11-21 01:25:35,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-21 01:25:35,012 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:25:35,013 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:25:35,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:25:35,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:25:35,229 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:25:35,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:25:35,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1506060358, now seen corresponding path program 6 times [2021-11-21 01:25:35,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:25:35,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646993256] [2021-11-21 01:25:35,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:25:35,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:25:35,238 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:25:35,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [399738399] [2021-11-21 01:25:35,238 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:25:35,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:25:35,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:25:35,251 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:25:35,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:25:35,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:25:35,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:25:35,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 01:25:35,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:25:38,581 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 145 proven. 92 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-21 01:25:38,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:08,096 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 121 proven. 77 refuted. 4 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-21 01:26:08,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:08,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646993256] [2021-11-21 01:26:08,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:26:08,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399738399] [2021-11-21 01:26:08,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399738399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:08,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055878710] [2021-11-21 01:26:08,099 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:26:08,099 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:08,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:08,100 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:08,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:19,173 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:26:19,242 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:26:19,253 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:53,179 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:53,180 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:26:53,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 32 [2021-11-21 01:26:53,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295633193] [2021-11-21 01:26:53,180 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:53,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:26:53,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:53,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:26:53,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=2390, Unknown=13, NotChecked=0, Total=2756 [2021-11-21 01:26:53,184 INFO L87 Difference]: Start difference. First operand 228 states and 282 transitions. Second operand has 32 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 23 states have internal predecessors, (47), 19 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (41), 19 states have call predecessors, (41), 18 states have call successors, (41) [2021-11-21 01:26:55,733 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:26:59,003 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:27:28,219 WARN L227 SmtUtils]: Spent 28.96s on a formula simplification. DAG size of input: 85 DAG size of output: 74 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:27:40,378 WARN L227 SmtUtils]: Spent 9.73s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:27:42,436 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:27:44,445 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:27:46,447 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:27:48,504 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:03,939 WARN L227 SmtUtils]: Spent 14.66s on a formula simplification that was a NOOP. DAG size: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:28:06,685 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:08,690 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:10,693 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:16,467 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:18,629 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:23,266 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:29,630 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:38,622 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:40,637 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:42,962 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:44,975 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:54,339 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:57,401 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:28:59,253 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:29:01,385 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:29:04,150 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:29:07,135 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:29:22,780 WARN L227 SmtUtils]: Spent 12.13s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:29:23,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:23,227 INFO L93 Difference]: Finished difference Result 322 states and 404 transitions. [2021-11-21 01:29:23,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 01:29:23,228 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 23 states have internal predecessors, (47), 19 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (41), 19 states have call predecessors, (41), 18 states have call successors, (41) Word has length 115 [2021-11-21 01:29:23,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:23,231 INFO L225 Difference]: With dead ends: 322 [2021-11-21 01:29:23,232 INFO L226 Difference]: Without dead ends: 320 [2021-11-21 01:29:23,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 285 SyntacticMatches, 8 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1784 ImplicationChecksByTransitivity, 159.1s TimeCoverageRelationStatistics Valid=645, Invalid=3755, Unknown=22, NotChecked=0, Total=4422 [2021-11-21 01:29:23,234 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 137 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 926 mSolverCounterSat, 255 mSolverCounterUnsat, 19 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 52.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 1200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 926 IncrementalHoareTripleChecker+Invalid, 19 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:23,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 428 Invalid, 1200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 926 Invalid, 19 Unknown, 0 Unchecked, 52.2s Time] [2021-11-21 01:29:23,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-21 01:29:23,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 317. [2021-11-21 01:29:23,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 182 states have (on average 1.098901098901099) internal successors, (200), 188 states have internal predecessors, (200), 100 states have call successors, (100), 34 states have call predecessors, (100), 34 states have return successors, (99), 94 states have call predecessors, (99), 99 states have call successors, (99) [2021-11-21 01:29:23,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 399 transitions. [2021-11-21 01:29:23,325 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 399 transitions. Word has length 115 [2021-11-21 01:29:23,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:23,325 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 399 transitions. [2021-11-21 01:29:23,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 23 states have internal predecessors, (47), 19 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (41), 19 states have call predecessors, (41), 18 states have call successors, (41) [2021-11-21 01:29:23,326 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 399 transitions. [2021-11-21 01:29:23,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 01:29:23,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:23,327 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:23,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:23,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:29:23,529 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:23,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:23,529 INFO L85 PathProgramCache]: Analyzing trace with hash 1538893617, now seen corresponding path program 3 times [2021-11-21 01:29:23,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:23,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290461702] [2021-11-21 01:29:23,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:23,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:23,536 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:29:23,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [317180635] [2021-11-21 01:29:23,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:29:23,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:23,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:23,538 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:23,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:29:23,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:29:23,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:29:23,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 01:29:23,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:25,107 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 80 proven. 144 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2021-11-21 01:29:25,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:28,536 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 69 proven. 123 refuted. 0 times theorem prover too weak. 393 trivial. 0 not checked. [2021-11-21 01:29:28,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:28,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290461702] [2021-11-21 01:29:28,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:29:28,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317180635] [2021-11-21 01:29:28,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317180635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:28,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [36888439] [2021-11-21 01:29:28,538 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:29:28,538 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:28,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:28,539 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:28,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:50,782 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:29:50,836 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:29:50,846 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:29:57,323 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:29:57,323 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:29:57,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 32 [2021-11-21 01:29:57,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715897602] [2021-11-21 01:29:57,324 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:29:57,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 01:29:57,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:57,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 01:29:57,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=2510, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:29:57,326 INFO L87 Difference]: Start difference. First operand 317 states and 399 transitions. Second operand has 32 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 18 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (43), 14 states have call predecessors, (43), 16 states have call successors, (43) [2021-11-21 01:30:21,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:21,734 INFO L93 Difference]: Finished difference Result 399 states and 514 transitions. [2021-11-21 01:30:21,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 01:30:21,735 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 18 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (43), 14 states have call predecessors, (43), 16 states have call successors, (43) Word has length 121 [2021-11-21 01:30:21,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:21,737 INFO L225 Difference]: With dead ends: 399 [2021-11-21 01:30:21,738 INFO L226 Difference]: Without dead ends: 391 [2021-11-21 01:30:21,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 306 SyntacticMatches, 8 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2756 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=1177, Invalid=6833, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 01:30:21,741 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 160 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 1023 mSolverCounterSat, 453 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 1476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 453 IncrementalHoareTripleChecker+Valid, 1023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:21,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 537 Invalid, 1476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [453 Valid, 1023 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2021-11-21 01:30:21,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-21 01:30:21,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 369. [2021-11-21 01:30:21,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 206 states have (on average 1.1067961165048543) internal successors, (228), 212 states have internal predecessors, (228), 124 states have call successors, (124), 38 states have call predecessors, (124), 38 states have return successors, (123), 118 states have call predecessors, (123), 123 states have call successors, (123) [2021-11-21 01:30:21,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 475 transitions. [2021-11-21 01:30:21,889 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 475 transitions. Word has length 121 [2021-11-21 01:30:21,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:21,889 INFO L470 AbstractCegarLoop]: Abstraction has 369 states and 475 transitions. [2021-11-21 01:30:21,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 28 states have (on average 1.75) internal successors, (49), 26 states have internal predecessors, (49), 18 states have call successors, (44), 2 states have call predecessors, (44), 3 states have return successors, (43), 14 states have call predecessors, (43), 16 states have call successors, (43) [2021-11-21 01:30:21,890 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 475 transitions. [2021-11-21 01:30:21,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-21 01:30:21,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:21,893 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:21,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-21 01:30:22,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:30:22,109 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:22,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:22,109 INFO L85 PathProgramCache]: Analyzing trace with hash -901797274, now seen corresponding path program 7 times [2021-11-21 01:30:22,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:22,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88358732] [2021-11-21 01:30:22,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:22,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:22,116 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:30:22,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [663109232] [2021-11-21 01:30:22,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:30:22,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:22,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:22,118 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:22,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:30:22,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:22,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:30:22,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:22,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 305 proven. 66 refuted. 0 times theorem prover too weak. 809 trivial. 0 not checked. [2021-11-21 01:30:22,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:23,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:23,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88358732] [2021-11-21 01:30:23,590 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:30:23,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663109232] [2021-11-21 01:30:23,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663109232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:23,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [867324808] [2021-11-21 01:30:23,592 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:30:23,592 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:23,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:23,593 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:23,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:30:30,240 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:30,240 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:31,376 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:31,376 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:35,722 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:35,722 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:38,655 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:38,656 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:30:52,320 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:30:52,384 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:30:52,395 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:04,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:04,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:31:04,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-21 01:31:04,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131119167] [2021-11-21 01:31:04,931 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:04,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-21 01:31:04,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:04,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-21 01:31:04,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1246, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:31:04,933 INFO L87 Difference]: Start difference. First operand 369 states and 475 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 7 states have call predecessors, (25), 8 states have call successors, (25) [2021-11-21 01:31:05,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:31:05,970 INFO L93 Difference]: Finished difference Result 511 states and 673 transitions. [2021-11-21 01:31:05,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:31:05,971 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 7 states have call predecessors, (25), 8 states have call successors, (25) Word has length 159 [2021-11-21 01:31:05,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:31:05,974 INFO L225 Difference]: With dead ends: 511 [2021-11-21 01:31:05,974 INFO L226 Difference]: Without dead ends: 411 [2021-11-21 01:31:05,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 370 SyntacticMatches, 5 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=405, Invalid=2787, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:31:05,977 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 44 mSDsluCounter, 594 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:31:05,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 676 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:31:05,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-11-21 01:31:06,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 404. [2021-11-21 01:31:06,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 221 states have (on average 1.0995475113122173) internal successors, (243), 228 states have internal predecessors, (243), 144 states have call successors, (144), 38 states have call predecessors, (144), 38 states have return successors, (143), 137 states have call predecessors, (143), 143 states have call successors, (143) [2021-11-21 01:31:06,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 530 transitions. [2021-11-21 01:31:06,208 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 530 transitions. Word has length 159 [2021-11-21 01:31:06,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:31:06,209 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 530 transitions. [2021-11-21 01:31:06,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 7 states have call predecessors, (25), 8 states have call successors, (25) [2021-11-21 01:31:06,209 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 530 transitions. [2021-11-21 01:31:06,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-21 01:31:06,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:31:06,212 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:31:06,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:31:06,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:06,431 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:31:06,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:31:06,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1389194927, now seen corresponding path program 4 times [2021-11-21 01:31:06,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:31:06,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063576734] [2021-11-21 01:31:06,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:31:06,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:31:06,439 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:31:06,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1952364674] [2021-11-21 01:31:06,440 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:31:06,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:31:06,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:31:06,441 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:31:06,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:31:06,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:31:06,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-21 01:31:06,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:31:13,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 231 proven. 204 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2021-11-21 01:31:13,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:31:15,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 250 proven. 12 refuted. 0 times theorem prover too weak. 1017 trivial. 0 not checked. [2021-11-21 01:31:15,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:31:15,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063576734] [2021-11-21 01:31:15,584 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:31:15,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952364674] [2021-11-21 01:31:15,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952364674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:31:15,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649012992] [2021-11-21 01:31:15,586 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-21 01:31:15,586 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:31:15,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:31:15,587 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:31:15,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:31:22,468 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:22,469 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:23,690 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:23,691 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:28,923 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:28,924 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:31,293 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:31,294 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:31:39,760 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:31:39,822 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-21 01:31:39,833 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:31:58,716 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:31:58,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:31:58,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12] total 28 [2021-11-21 01:31:58,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41638559] [2021-11-21 01:31:58,717 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:31:58,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-21 01:31:58,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:31:58,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-21 01:31:58,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=2171, Unknown=0, NotChecked=0, Total=2450 [2021-11-21 01:31:58,718 INFO L87 Difference]: Start difference. First operand 404 states and 530 transitions. Second operand has 28 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 16 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 14 states have call predecessors, (42), 14 states have call successors, (42) [2021-11-21 01:32:20,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:32:20,909 INFO L93 Difference]: Finished difference Result 490 states and 651 transitions. [2021-11-21 01:32:20,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 01:32:20,910 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 16 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 14 states have call predecessors, (42), 14 states have call successors, (42) Word has length 165 [2021-11-21 01:32:20,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:32:20,916 INFO L225 Difference]: With dead ends: 490 [2021-11-21 01:32:20,916 INFO L226 Difference]: Without dead ends: 482 [2021-11-21 01:32:20,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 437 SyntacticMatches, 8 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1438 ImplicationChecksByTransitivity, 37.7s TimeCoverageRelationStatistics Valid=538, Invalid=3752, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:32:20,919 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 96 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 1462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:32:20,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 521 Invalid, 1462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 1207 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2021-11-21 01:32:20,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-11-21 01:32:21,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 433. [2021-11-21 01:32:21,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 237 states have (on average 1.0843881856540085) internal successors, (257), 243 states have internal predecessors, (257), 152 states have call successors, (152), 43 states have call predecessors, (152), 43 states have return successors, (152), 146 states have call predecessors, (152), 152 states have call successors, (152) [2021-11-21 01:32:21,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 561 transitions. [2021-11-21 01:32:21,096 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 561 transitions. Word has length 165 [2021-11-21 01:32:21,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:32:21,097 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 561 transitions. [2021-11-21 01:32:21,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 16 states have call successors, (42), 2 states have call predecessors, (42), 3 states have return successors, (42), 14 states have call predecessors, (42), 14 states have call successors, (42) [2021-11-21 01:32:21,097 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 561 transitions. [2021-11-21 01:32:21,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-21 01:32:21,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:32:21,100 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:32:21,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-21 01:32:21,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:21,316 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:32:21,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:32:21,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1233094373, now seen corresponding path program 8 times [2021-11-21 01:32:21,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:32:21,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247425156] [2021-11-21 01:32:21,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:32:21,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:32:21,328 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:32:21,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [936358771] [2021-11-21 01:32:21,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:32:21,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:32:21,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:32:21,338 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:32:21,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d796c3f5-5d99-41fa-9100-b22c3ad64d45/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:32:21,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:32:21,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:32:21,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-21 01:32:21,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:32:26,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1615 backedges. 197 proven. 124 refuted. 0 times theorem prover too weak. 1294 trivial. 0 not checked. [2021-11-21 01:32:26,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:32:32,319 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:32:32,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247425156] [2021-11-21 01:32:32,319 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:32:32,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936358771] [2021-11-21 01:32:32,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936358771] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:32:32,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000568724] [2021-11-21 01:32:32,321 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-21 01:32:32,321 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:32:32,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:32:32,321 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:32:32,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:32:39,124 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:39,124 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:40,314 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:40,315 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:42,271 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:42,271 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:45,038 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2021-11-21 01:32:45,038 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse.