./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7 --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 e587d407128aaafd417211e5ccf66790913a0bc1afeba03ae0cdb578f5831614 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:20:05,218 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:20:05,220 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:20:05,252 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:20:05,253 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:20:05,254 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:20:05,256 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:20:05,258 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:20:05,260 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:20:05,261 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:20:05,262 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:20:05,264 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:20:05,264 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:20:05,266 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:20:05,267 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:20:05,269 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:20:05,270 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:20:05,271 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:20:05,274 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:20:05,276 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:20:05,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:20:05,285 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:20:05,286 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:20:05,292 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:20:05,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:20:05,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:20:05,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:20:05,300 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:20:05,300 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:20:05,301 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:20:05,302 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:20:05,303 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:20:05,304 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:20:05,305 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:20:05,306 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:20:05,306 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:20:05,307 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:20:05,307 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:20:05,308 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:20:05,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:20:05,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:20:05,311 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:20:05,338 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:20:05,338 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:20:05,339 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:20:05,339 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:20:05,340 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:20:05,340 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:20:05,340 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:20:05,340 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:20:05,341 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:20:05,341 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:20:05,341 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:20:05,341 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:20:05,341 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:20:05,342 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:20:05,342 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:20:05,342 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:20:05,342 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:20:05,342 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:20:05,343 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:20:05,343 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:20:05,344 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:20:05,344 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:20:05,344 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:20:05,344 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:20:05,344 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:20:05,345 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:20:05,345 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:20:05,345 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:20:05,345 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:20:05,345 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:20:05,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:20:05,346 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:20:05,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:20:05,346 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:20:05,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:20:05,347 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:20:05,347 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:20:05,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:20:05,347 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:20:05,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:20:05,348 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:20:05,348 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_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e587d407128aaafd417211e5ccf66790913a0bc1afeba03ae0cdb578f5831614 [2021-11-25 18:20:05,584 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:20:05,603 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:20:05,605 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:20:05,607 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:20:05,607 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:20:05,608 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c [2021-11-25 18:20:05,669 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/data/b8befd476/43348fdb0f4e40f5a45e86d4c2a04c37/FLAG3efc4fac7 [2021-11-25 18:20:06,072 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:20:06,073 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c [2021-11-25 18:20:06,087 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/data/b8befd476/43348fdb0f4e40f5a45e86d4c2a04c37/FLAG3efc4fac7 [2021-11-25 18:20:06,458 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/data/b8befd476/43348fdb0f4e40f5a45e86d4c2a04c37 [2021-11-25 18:20:06,461 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:20:06,462 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:20:06,468 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:20:06,469 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:20:06,472 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:20:06,473 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,474 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@431d5766 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06, skipping insertion in model container [2021-11-25 18:20:06,475 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,481 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:20:06,497 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:20:06,663 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_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c[490,503] [2021-11-25 18:20:06,683 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:20:06,691 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:20:06,701 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_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound20.c[490,503] [2021-11-25 18:20:06,711 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:20:06,733 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:20:06,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06 WrapperNode [2021-11-25 18:20:06,734 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:20:06,735 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:20:06,735 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:20:06,736 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:20:06,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,760 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,794 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-25 18:20:06,798 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:20:06,800 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:20:06,800 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:20:06,800 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:20:06,808 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,825 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,829 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,830 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,832 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:20:06,833 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:20:06,833 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:20:06,833 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:20:06,840 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (1/1) ... [2021-11-25 18:20:06,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:20:06,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:06,876 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:20:06,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:20:06,924 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:20:06,925 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 18:20:06,925 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 18:20:06,925 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:20:06,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:20:06,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:20:06,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:20:06,926 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:20:06,998 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:20:07,000 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:20:07,189 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:20:07,225 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:20:07,239 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:20:07,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:20:07 BoogieIcfgContainer [2021-11-25 18:20:07,242 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:20:07,244 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:20:07,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:20:07,266 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:20:07,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:20:06" (1/3) ... [2021-11-25 18:20:07,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fbd859c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:20:07, skipping insertion in model container [2021-11-25 18:20:07,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:20:06" (2/3) ... [2021-11-25 18:20:07,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fbd859c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:20:07, skipping insertion in model container [2021-11-25 18:20:07,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:20:07" (3/3) ... [2021-11-25 18:20:07,270 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound20.c [2021-11-25 18:20:07,275 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:20:07,287 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:20:07,331 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:20:07,338 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 [2021-11-25 18:20:07,338 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:20:07,355 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) [2021-11-25 18:20:07,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 18:20:07,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:07,362 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] [2021-11-25 18:20:07,363 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:07,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:07,368 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-25 18:20:07,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:07,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182965416] [2021-11-25 18:20:07,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:07,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:07,479 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:07,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [248356806] [2021-11-25 18:20:07,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:07,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:07,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:07,483 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:07,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:20:07,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:07,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 18:20:07,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:07,679 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:20:07,680 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:20:07,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:07,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182965416] [2021-11-25 18:20:07,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:07,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248356806] [2021-11-25 18:20:07,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248356806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:20:07,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:20:07,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:20:07,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873441937] [2021-11-25 18:20:07,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:07,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:20:07,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:07,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:20:07,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:20:07,720 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) [2021-11-25 18:20:07,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:07,774 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-25 18:20:07,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:20:07,786 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 [2021-11-25 18:20:07,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:07,796 INFO L225 Difference]: With dead ends: 49 [2021-11-25 18:20:07,796 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 18:20:07,799 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 [2021-11-25 18:20:07,803 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 [2021-11-25 18:20:07,804 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] [2021-11-25 18:20:07,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 18:20:07,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 18:20:07,839 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) [2021-11-25 18:20:07,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-25 18:20:07,843 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-25 18:20:07,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:07,844 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-25 18:20:07,845 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) [2021-11-25 18:20:07,845 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-25 18:20:07,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:20:07,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:07,847 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] [2021-11-25 18:20:07,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:08,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 18:20:08,064 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:08,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:08,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-25 18:20:08,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:08,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371135498] [2021-11-25 18:20:08,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:08,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:08,091 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:08,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34375302] [2021-11-25 18:20:08,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:08,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:08,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:08,098 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:08,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:20:08,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:08,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:20:08,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:08,350 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:20:08,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:08,495 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:20:08,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:08,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371135498] [2021-11-25 18:20:08,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:08,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34375302] [2021-11-25 18:20:08,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34375302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:20:08,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011188363] [2021-11-25 18:20:08,517 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:20:08,517 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:20:08,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:20:08,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:20:08,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:20:09,812 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:20:09,842 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:20:10,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2011188363] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:20:10,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:20:10,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-25 18:20:10,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878638093] [2021-11-25 18:20:10,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:10,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:20:10,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:10,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:20:10,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:20:10,775 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) [2021-11-25 18:20:10,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:10,990 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-25 18:20:10,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:20:10,991 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 [2021-11-25 18:20:10,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:10,993 INFO L225 Difference]: With dead ends: 38 [2021-11-25 18:20:10,993 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 18:20:10,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:20:10,999 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:11,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 48 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:20:11,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 18:20:11,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 18:20:11,022 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) [2021-11-25 18:20:11,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-25 18:20:11,025 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-25 18:20:11,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:11,026 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-25 18:20:11,026 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) [2021-11-25 18:20:11,026 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-25 18:20:11,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 18:20:11,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:11,037 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] [2021-11-25 18:20:11,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:11,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:11,250 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:11,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:11,251 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-25 18:20:11,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:11,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442957252] [2021-11-25 18:20:11,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:11,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:11,272 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:11,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2033638511] [2021-11-25 18:20:11,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:11,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:11,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:11,276 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:11,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:20:11,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:11,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:20:11,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:11,482 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:20:11,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:11,567 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:20:11,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:11,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442957252] [2021-11-25 18:20:11,568 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:11,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033638511] [2021-11-25 18:20:11,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033638511] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:20:11,568 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:20:11,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 18:20:11,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92772787] [2021-11-25 18:20:11,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:11,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:20:11,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:11,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:20:11,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:20:11,571 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) [2021-11-25 18:20:11,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:11,623 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-25 18:20:11,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:20:11,624 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 [2021-11-25 18:20:11,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:11,625 INFO L225 Difference]: With dead ends: 36 [2021-11-25 18:20:11,625 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 18:20:11,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:20:11,627 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:11,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:20:11,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 18:20:11,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-25 18:20:11,639 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) [2021-11-25 18:20:11,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-25 18:20:11,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-25 18:20:11,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:11,641 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-25 18:20:11,641 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) [2021-11-25 18:20:11,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-25 18:20:11,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 18:20:11,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:11,643 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] [2021-11-25 18:20:11,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:11,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:11,864 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:11,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:11,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-25 18:20:11,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:11,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998190010] [2021-11-25 18:20:11,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:11,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:11,880 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:11,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1018766259] [2021-11-25 18:20:11,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:11,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:11,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:11,881 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:11,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:20:11,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:11,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 18:20:11,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:12,161 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:20:12,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:12,277 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:20:12,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:12,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998190010] [2021-11-25 18:20:12,282 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:12,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018766259] [2021-11-25 18:20:12,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018766259] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:20:12,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:20:12,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 18:20:12,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147326552] [2021-11-25 18:20:12,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:12,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:20:12,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:12,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:20:12,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:20:12,292 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) [2021-11-25 18:20:12,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:12,347 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-25 18:20:12,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:20:12,348 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 [2021-11-25 18:20:12,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:12,351 INFO L225 Difference]: With dead ends: 47 [2021-11-25 18:20:12,351 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 18:20:12,352 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 [2021-11-25 18:20:12,354 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:12,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:20:12,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 18:20:12,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-25 18:20:12,375 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) [2021-11-25 18:20:12,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-25 18:20:12,379 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-25 18:20:12,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:12,379 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-25 18:20:12,380 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) [2021-11-25 18:20:12,380 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-25 18:20:12,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 18:20:12,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:12,384 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] [2021-11-25 18:20:12,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:12,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:12,602 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:12,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:12,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-25 18:20:12,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:12,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950828193] [2021-11-25 18:20:12,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:12,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:12,615 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:12,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1583432599] [2021-11-25 18:20:12,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:12,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:12,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:12,617 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:12,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:20:12,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:12,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:20:12,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 18:20:12,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:12,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:12,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950828193] [2021-11-25 18:20:12,882 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:12,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583432599] [2021-11-25 18:20:12,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583432599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:20:12,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [612588941] [2021-11-25 18:20:12,885 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 18:20:12,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:20:12,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:20:12,886 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:20:12,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:20:13,971 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 18:20:13,987 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:20:14,008 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:20:15,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [612588941] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:20:15,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:20:15,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-25 18:20:15,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483466457] [2021-11-25 18:20:15,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:15,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:20:15,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:15,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:20:15,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:20:15,361 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) [2021-11-25 18:20:15,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:15,685 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-25 18:20:15,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:20:15,685 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 [2021-11-25 18:20:15,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:15,686 INFO L225 Difference]: With dead ends: 65 [2021-11-25 18:20:15,686 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 18:20:15,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:20:15,687 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:15,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 47 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:20:15,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 18:20:15,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-25 18:20:15,701 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) [2021-11-25 18:20:15,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-25 18:20:15,703 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-25 18:20:15,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:15,703 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-25 18:20:15,704 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) [2021-11-25 18:20:15,704 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-25 18:20:15,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 18:20:15,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:15,705 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] [2021-11-25 18:20:15,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:15,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:15,932 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:15,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:15,932 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-25 18:20:15,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:15,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938613404] [2021-11-25 18:20:15,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:15,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:15,961 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:15,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1282956359] [2021-11-25 18:20:15,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:15,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:15,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:15,963 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:15,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:20:16,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:16,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:20:16,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:16,165 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 18:20:16,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:16,284 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 18:20:16,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:16,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938613404] [2021-11-25 18:20:16,285 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:16,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282956359] [2021-11-25 18:20:16,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282956359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:20:16,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678552710] [2021-11-25 18:20:16,288 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 18:20:16,289 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:20:16,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:20:16,289 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:20:16,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:20:31,699 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-25 18:20:31,705 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:20:31,722 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:20:34,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1775#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:20:34,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:20:34,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:20:34,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-11-25 18:20:34,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694748839] [2021-11-25 18:20:34,674 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:20:34,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:20:34,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:34,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:20:34,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:20:34,676 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 18:20:34,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:34,880 INFO L93 Difference]: Finished difference Result 103 states and 142 transitions. [2021-11-25 18:20:34,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:20:34,881 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2021-11-25 18:20:34,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:34,886 INFO L225 Difference]: With dead ends: 103 [2021-11-25 18:20:34,886 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 18:20:34,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:20:34,889 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 28 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:34,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 239 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:20:34,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 18:20:34,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2021-11-25 18:20:34,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 32 states have call successors, (32), 7 states have call predecessors, (32), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-25 18:20:34,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-25 18:20:34,915 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 52 [2021-11-25 18:20:34,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:34,916 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-25 18:20:34,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 18:20:34,916 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-25 18:20:34,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 18:20:34,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:34,917 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:20:34,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:35,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:35,140 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:35,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:35,141 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2021-11-25 18:20:35,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:35,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197161419] [2021-11-25 18:20:35,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:35,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:35,150 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:35,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [33269286] [2021-11-25 18:20:35,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:35,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:35,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:35,152 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:35,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:20:35,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:35,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:20:35,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:35,341 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:20:35,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:35,500 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:20:35,500 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:35,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197161419] [2021-11-25 18:20:35,500 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:35,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33269286] [2021-11-25 18:20:35,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33269286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:20:35,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [152553101] [2021-11-25 18:20:35,504 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:20:35,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:20:35,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:20:35,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:20:35,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:20:48,700 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 18:20:48,711 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:20:48,724 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:20:52,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [152553101] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:20:52,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:20:52,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [8, 8] total 24 [2021-11-25 18:20:52,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406842317] [2021-11-25 18:20:52,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:20:52,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:20:52,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:20:52,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:20:52,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:20:52,478 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 18:20:53,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:20:53,813 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-25 18:20:53,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 18:20:53,814 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 58 [2021-11-25 18:20:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:20:53,816 INFO L225 Difference]: With dead ends: 105 [2021-11-25 18:20:53,816 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 18:20:53,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 133 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:20:53,817 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 74 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:20:53,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 50 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:20:53,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 18:20:53,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-25 18:20:53,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 57 states have (on average 1.1754385964912282) internal successors, (67), 58 states have internal predecessors, (67), 36 states have call successors, (36), 9 states have call predecessors, (36), 9 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 18:20:53,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 138 transitions. [2021-11-25 18:20:53,840 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 138 transitions. Word has length 58 [2021-11-25 18:20:53,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:20:53,841 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 138 transitions. [2021-11-25 18:20:53,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 18:20:53,842 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 138 transitions. [2021-11-25 18:20:53,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:20:53,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:20:53,843 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] [2021-11-25 18:20:53,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:20:54,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:54,064 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:20:54,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:20:54,064 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-25 18:20:54,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:20:54,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629474029] [2021-11-25 18:20:54,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:54,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:20:54,072 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:20:54,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1230744305] [2021-11-25 18:20:54,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:20:54,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:20:54,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:20:54,075 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:20:54,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:20:54,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:20:54,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:20:54,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:20:54,265 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 18:20:54,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:20:54,395 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 18:20:54,395 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:20:54,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629474029] [2021-11-25 18:20:54,396 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:20:54,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230744305] [2021-11-25 18:20:54,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230744305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:20:54,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986409516] [2021-11-25 18:20:54,398 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 18:20:54,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:20:54,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:20:54,399 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:20:54,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:21:03,955 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2021-11-25 18:21:03,974 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:21:03,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:21:08,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3154#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:21:08,065 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:21:08,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:21:08,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 18:21:08,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973454566] [2021-11-25 18:21:08,066 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:21:08,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:21:08,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:08,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:21:08,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:21:08,068 INFO L87 Difference]: Start difference. First operand 103 states and 138 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) [2021-11-25 18:21:08,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:08,223 INFO L93 Difference]: Finished difference Result 117 states and 153 transitions. [2021-11-25 18:21:08,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:21:08,223 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 [2021-11-25 18:21:08,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:08,227 INFO L225 Difference]: With dead ends: 117 [2021-11-25 18:21:08,227 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 18:21:08,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 143 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:21:08,229 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:08,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 93 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:08,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 18:21:08,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-25 18:21:08,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 64 states have (on average 1.15625) internal successors, (74), 66 states have internal predecessors, (74), 39 states have call successors, (39), 11 states have call predecessors, (39), 11 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-25 18:21:08,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 151 transitions. [2021-11-25 18:21:08,253 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 151 transitions. Word has length 60 [2021-11-25 18:21:08,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:08,254 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 151 transitions. [2021-11-25 18:21:08,254 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) [2021-11-25 18:21:08,255 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 151 transitions. [2021-11-25 18:21:08,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:21:08,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:08,256 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] [2021-11-25 18:21:08,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:08,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:08,484 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:08,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:08,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-25 18:21:08,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:08,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811371807] [2021-11-25 18:21:08,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:08,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:08,494 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:21:08,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1812002209] [2021-11-25 18:21:08,498 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:21:08,498 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:08,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:08,499 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:08,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:21:08,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:21:08,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:21:08,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:21:08,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:08,731 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 18:21:08,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:21:08,921 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 18:21:08,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:08,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811371807] [2021-11-25 18:21:08,922 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:21:08,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812002209] [2021-11-25 18:21:08,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812002209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:21:08,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149652121] [2021-11-25 18:21:08,924 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 18:21:08,924 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:21:08,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:21:08,925 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:21:08,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:21:14,818 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-25 18:21:14,899 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:21:14,914 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:21:18,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3927#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:21:18,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:21:18,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:21:18,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 18:21:18,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869569490] [2021-11-25 18:21:18,818 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:21:18,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:21:18,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:18,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:21:18,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:21:18,820 INFO L87 Difference]: Start difference. First operand 115 states and 151 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) [2021-11-25 18:21:18,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:18,962 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2021-11-25 18:21:18,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:21:18,963 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 [2021-11-25 18:21:18,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:18,964 INFO L225 Difference]: With dead ends: 122 [2021-11-25 18:21:18,965 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 18:21:18,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:21:18,966 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:18,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 128 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:18,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 18:21:18,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-25 18:21:18,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-25 18:21:18,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2021-11-25 18:21:18,995 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2021-11-25 18:21:18,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:18,996 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2021-11-25 18:21:18,996 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) [2021-11-25 18:21:18,997 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2021-11-25 18:21:18,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 18:21:18,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:18,998 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] [2021-11-25 18:21:19,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:19,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:19,208 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:19,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:19,208 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-25 18:21:19,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:19,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530495893] [2021-11-25 18:21:19,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:19,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:19,218 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:21:19,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2032304595] [2021-11-25 18:21:19,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:19,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:19,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:19,224 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:19,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:21:19,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:19,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 18:21:19,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:19,844 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 18:21:19,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:21:20,486 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 18:21:20,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:20,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530495893] [2021-11-25 18:21:20,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:21:20,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032304595] [2021-11-25 18:21:20,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032304595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:21:20,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1262284040] [2021-11-25 18:21:20,489 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 18:21:20,489 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:21:20,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:21:20,490 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:21:20,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:21:23,790 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 18:21:23,811 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:21:23,824 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:22:03,011 WARN L227 SmtUtils]: Spent 35.42s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:24,655 WARN L227 SmtUtils]: Spent 20.92s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:22:44,040 WARN L227 SmtUtils]: Spent 10.89s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:23:09,792 WARN L227 SmtUtils]: Spent 21.15s on a formula simplification. DAG size of input: 183 DAG size of output: 91 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:23:09,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4775#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 18:23:09,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:09,794 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:09,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-25 18:23:09,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636281939] [2021-11-25 18:23:09,794 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:09,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:23:09,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:09,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:23:09,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1153, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:23:09,797 INFO L87 Difference]: Start difference. First operand 120 states and 156 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) [2021-11-25 18:23:17,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:17,752 INFO L93 Difference]: Finished difference Result 203 states and 282 transitions. [2021-11-25 18:23:17,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 18:23:17,753 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 [2021-11-25 18:23:17,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:17,757 INFO L225 Difference]: With dead ends: 203 [2021-11-25 18:23:17,757 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 18:23:17,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 110.3s TimeCoverageRelationStatistics Valid=412, Invalid=2668, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:23:17,760 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 65 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:17,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 426 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-25 18:23:17,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 18:23:17,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 191. [2021-11-25 18:23:17,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 104 states have internal predecessors, (124), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 71 states have call predecessors, (72), 72 states have call successors, (72) [2021-11-25 18:23:17,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 269 transitions. [2021-11-25 18:23:17,811 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 269 transitions. Word has length 74 [2021-11-25 18:23:17,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:17,812 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 269 transitions. [2021-11-25 18:23:17,812 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) [2021-11-25 18:23:17,812 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 269 transitions. [2021-11-25 18:23:17,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 18:23:17,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:17,814 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] [2021-11-25 18:23:17,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:18,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:23:18,028 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:18,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:18,028 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-25 18:23:18,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:18,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327792100] [2021-11-25 18:23:18,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:18,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:18,039 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:18,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2047845595] [2021-11-25 18:23:18,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:18,040 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:18,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:18,041 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:18,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:23:18,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:23:18,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 18:23:18,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:18,467 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-25 18:23:18,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:18,679 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 18:23:18,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:18,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327792100] [2021-11-25 18:23:18,680 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:18,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047845595] [2021-11-25 18:23:18,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047845595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:23:18,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1769877737] [2021-11-25 18:23:18,682 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 18:23:18,683 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:18,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:18,683 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:18,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:23,019 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 18:23:23,022 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:23:23,035 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:49,896 WARN L227 SmtUtils]: Spent 23.64s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:24:10,747 WARN L227 SmtUtils]: Spent 20.69s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:24:21,048 WARN L227 SmtUtils]: Spent 8.41s 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) [2021-11-25 18:24:39,645 WARN L227 SmtUtils]: Spent 18.08s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:24:57,006 WARN L227 SmtUtils]: Spent 15.36s on a formula simplification. DAG size of input: 183 DAG size of output: 91 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:24:57,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5939#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 18:24:57,355 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:57,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:57,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-25 18:24:57,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556315775] [2021-11-25 18:24:57,356 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:57,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 18:24:57,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:57,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 18:24:57,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:24:57,357 INFO L87 Difference]: Start difference. First operand 191 states and 269 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) [2021-11-25 18:24:58,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:58,897 INFO L93 Difference]: Finished difference Result 224 states and 306 transitions. [2021-11-25 18:24:58,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:24:58,898 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 [2021-11-25 18:24:58,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:58,900 INFO L225 Difference]: With dead ends: 224 [2021-11-25 18:24:58,900 INFO L226 Difference]: Without dead ends: 218 [2021-11-25 18:24:58,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 203 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 94.9s TimeCoverageRelationStatistics Valid=238, Invalid=1654, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 18:24:58,902 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 36 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:58,903 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 383 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:24:58,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-25 18:24:58,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 216. [2021-11-25 18:24:58,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 122 states have (on average 1.1639344262295082) internal successors, (142), 125 states have internal predecessors, (142), 75 states have call successors, (75), 18 states have call predecessors, (75), 18 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 18:24:58,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 291 transitions. [2021-11-25 18:24:58,947 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 291 transitions. Word has length 79 [2021-11-25 18:24:58,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:58,948 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 291 transitions. [2021-11-25 18:24:58,948 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) [2021-11-25 18:24:58,948 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 291 transitions. [2021-11-25 18:24:58,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 18:24:58,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:58,951 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] [2021-11-25 18:24:58,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:59,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:59,160 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:59,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:59,160 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-25 18:24:59,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:59,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176187398] [2021-11-25 18:24:59,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:59,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:59,174 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:24:59,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1386163313] [2021-11-25 18:24:59,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:59,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:59,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:59,181 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:59,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:24:59,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:59,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 18:24:59,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:59,982 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 18:24:59,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:25:03,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:03,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176187398] [2021-11-25 18:25:03,915 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:25:03,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386163313] [2021-11-25 18:25:03,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386163313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:03,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1497833002] [2021-11-25 18:25:03,918 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:25:03,918 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:25:03,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:25:03,919 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:25:03,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:25:08,159 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 18:25:08,167 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:25:08,180 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:25:46,059 WARN L227 SmtUtils]: Spent 34.12s on a formula simplification. DAG size of input: 181 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:08,547 WARN L227 SmtUtils]: Spent 9.88s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:20,875 WARN L227 SmtUtils]: Spent 11.16s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:26:21,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7073#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:26:21,045 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:26:21,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:26:21,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-25 18:26:21,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701352978] [2021-11-25 18:26:21,046 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:26:21,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:26:21,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:26:21,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:26:21,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1087, Unknown=1, NotChecked=0, Total=1260 [2021-11-25 18:26:21,047 INFO L87 Difference]: Start difference. First operand 216 states and 291 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) [2021-11-25 18:26:21,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:26:21,587 INFO L93 Difference]: Finished difference Result 228 states and 301 transitions. [2021-11-25 18:26:21,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:26:21,588 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 [2021-11-25 18:26:21,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:26:21,590 INFO L225 Difference]: With dead ends: 228 [2021-11-25 18:26:21,590 INFO L226 Difference]: Without dead ends: 226 [2021-11-25 18:26:21,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 171 SyntacticMatches, 14 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 76.7s TimeCoverageRelationStatistics Valid=195, Invalid=1286, Unknown=1, NotChecked=0, Total=1482 [2021-11-25 18:26:21,592 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 21 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:26:21,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 233 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:26:21,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-25 18:26:21,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 224. [2021-11-25 18:26:21,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 128 states have (on average 1.15625) internal successors, (148), 131 states have internal predecessors, (148), 75 states have call successors, (75), 20 states have call predecessors, (75), 20 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 18:26:21,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 297 transitions. [2021-11-25 18:26:21,650 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 297 transitions. Word has length 90 [2021-11-25 18:26:21,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:26:21,651 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 297 transitions. [2021-11-25 18:26:21,651 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) [2021-11-25 18:26:21,651 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 297 transitions. [2021-11-25 18:26:21,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 18:26:21,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:26:21,654 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] [2021-11-25 18:26:21,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:26:21,864 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:26:21,864 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:26:21,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:26:21,864 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-25 18:26:21,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:26:21,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4649621] [2021-11-25 18:26:21,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:26:21,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:26:21,875 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:26:21,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2139823114] [2021-11-25 18:26:21,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:26:21,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:26:21,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:26:21,877 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:26:21,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:26:21,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:26:21,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:26:21,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:26:21,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:26:22,051 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-25 18:26:22,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:26:22,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:26:22,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4649621] [2021-11-25 18:26:22,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:26:22,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139823114] [2021-11-25 18:26:22,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139823114] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:26:22,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:26:22,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:26:22,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309344195] [2021-11-25 18:26:22,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:26:22,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:26:22,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:26:22,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:26:22,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:26:22,053 INFO L87 Difference]: Start difference. First operand 224 states and 297 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) [2021-11-25 18:26:22,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:26:22,148 INFO L93 Difference]: Finished difference Result 306 states and 407 transitions. [2021-11-25 18:26:22,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:26:22,168 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 [2021-11-25 18:26:22,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:26:22,172 INFO L225 Difference]: With dead ends: 306 [2021-11-25 18:26:22,172 INFO L226 Difference]: Without dead ends: 209 [2021-11-25 18:26:22,178 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 [2021-11-25 18:26:22,181 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:26:22,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:26:22,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-25 18:26:22,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 184. [2021-11-25 18:26:22,220 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) [2021-11-25 18:26:22,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-25 18:26:22,222 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-25 18:26:22,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:26:22,223 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-25 18:26:22,223 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) [2021-11-25 18:26:22,223 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-25 18:26:22,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-25 18:26:22,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:26:22,225 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] [2021-11-25 18:26:22,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:26:22,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:26:22,428 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:26:22,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:26:22,429 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-25 18:26:22,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:26:22,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388054038] [2021-11-25 18:26:22,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:26:22,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:26:22,448 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:26:22,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1530462116] [2021-11-25 18:26:22,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:26:22,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:26:22,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:26:22,454 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:26:22,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:26:22,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:26:22,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:26:22,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:26:22,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:26:22,777 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-25 18:26:22,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:26:22,985 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-25 18:26:22,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:26:22,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388054038] [2021-11-25 18:26:22,986 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:26:22,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530462116] [2021-11-25 18:26:22,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530462116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:26:22,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1302844343] [2021-11-25 18:26:22,987 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:26:22,988 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:26:22,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:26:22,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:26:22,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:26:26,002 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2021-11-25 18:26:26,010 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:26:26,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:26:57,852 WARN L227 SmtUtils]: Spent 27.31s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:27:18,659 WARN L227 SmtUtils]: Spent 20.12s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:27:28,227 WARN L227 SmtUtils]: Spent 7.68s 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) [2021-11-25 18:27:39,121 WARN L227 SmtUtils]: Spent 10.26s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:27:39,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9495#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:27:39,320 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:27:39,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:27:39,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-25 18:27:39,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205278186] [2021-11-25 18:27:39,320 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:27:39,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:27:39,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:27:39,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:27:39,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:27:39,322 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) [2021-11-25 18:27:40,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:27:40,620 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-25 18:27:40,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:27:40,620 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 [2021-11-25 18:27:40,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:27:40,623 INFO L225 Difference]: With dead ends: 230 [2021-11-25 18:27:40,623 INFO L226 Difference]: Without dead ends: 228 [2021-11-25 18:27:40,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 265 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 74.2s TimeCoverageRelationStatistics Valid=215, Invalid=1507, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:27:40,624 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 38 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:27:40,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 291 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:27:40,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-25 18:27:40,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-25 18:27:40,661 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) [2021-11-25 18:27:40,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-25 18:27:40,662 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-25 18:27:40,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:27:40,663 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-25 18:27:40,663 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) [2021-11-25 18:27:40,663 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-25 18:27:40,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 18:27:40,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:27:40,665 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] [2021-11-25 18:27:40,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:27:40,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:27:40,876 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:27:40,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:27:40,877 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-25 18:27:40,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:27:40,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117156547] [2021-11-25 18:27:40,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:27:40,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:27:40,887 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:27:40,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007172629] [2021-11-25 18:27:40,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:27:40,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:27:40,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:27:40,889 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:27:40,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:27:40,945 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:27:40,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:27:40,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 18:27:40,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:27:41,767 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-25 18:27:41,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:27:49,418 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 42 refuted. 6 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-25 18:27:49,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:27:49,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117156547] [2021-11-25 18:27:49,419 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:27:49,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007172629] [2021-11-25 18:27:49,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007172629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:27:49,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886115702] [2021-11-25 18:27:49,421 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:27:49,421 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:27:49,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:27:49,421 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:27:49,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:27:54,772 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-25 18:27:54,780 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:27:54,793 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:28:28,521 WARN L227 SmtUtils]: Spent 29.11s on a formula simplification. DAG size of input: 179 DAG size of output: 146 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:28:59,894 WARN L227 SmtUtils]: Spent 26.21s on a formula simplification. DAG size of input: 77 DAG size of output: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:13,585 WARN L227 SmtUtils]: Spent 11.40s on a formula simplification. DAG size of input: 78 DAG size of output: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:29:14,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10831#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:29:14,356 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:29:14,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:29:14,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-25 18:29:14,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524615045] [2021-11-25 18:29:14,356 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:29:14,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 18:29:14,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:29:14,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 18:29:14,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1414, Unknown=3, NotChecked=0, Total=1640 [2021-11-25 18:29:14,358 INFO L87 Difference]: Start difference. First operand 188 states and 234 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-25 18:29:17,005 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse3 (= |c_ULTIMATE.start_main_~b~0#1| 0)) (.cse6 (* |c_ULTIMATE.start_main_~c~0#1| (- 1))) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse7 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse11 (* |c_ULTIMATE.start_main_~b~0#1| 2))) (and (or (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (= |c_ULTIMATE.start_main_~b~0#1| (+ (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|))) (let ((.cse2 (+ .cse6 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse4 (div .cse2 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse5 (* .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse2 |c_ULTIMATE.start_main_~b~0#1|) 0)) .cse3 (< .cse4 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (= (+ .cse0 .cse5 .cse1) (+ |c_ULTIMATE.start_main_~a~0#1| (* .cse4 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse4 |c_ULTIMATE.start_main_~s~0#1|))) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (<= (+ |c_ULTIMATE.start_main_~b~0#1| .cse5) |c_ULTIMATE.start_main_~a~0#1|))))) (let ((.cse10 (+ .cse11 .cse6 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse9 (div .cse10 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse8 (* .cse9 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse7) .cse3 (= (+ .cse8 .cse0 .cse1) (+ (* .cse9 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse9 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (<= (+ .cse8 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~a~0#1|) (not (= (mod .cse10 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse9 (+ 2 |c_ULTIMATE.start_main_~k~0#1|)))))) (let ((.cse13 (div .cse11 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse12 (* .cse13 |c_ULTIMATE.start_main_~b~0#1|))) (or (<= (+ .cse12 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~a~0#1|) (= (+ .cse12 .cse0 .cse1) (+ (* |c_ULTIMATE.start_main_~y~0#1| .cse13 |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| .cse13 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (< |c_ULTIMATE.start_main_~a~0#1| .cse7)))))) is different from true [2021-11-25 18:29:47,649 WARN L227 SmtUtils]: Spent 26.60s 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) [2021-11-25 18:29:50,377 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:29:52,179 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:29:56,672 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:30:01,085 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse3 (= |c_ULTIMATE.start_main_~b~0#1| 0)) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse6 (* |c_ULTIMATE.start_main_~c~0#1| (- 1)))) (and (or (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (let ((.cse2 (+ .cse6 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse4 (div .cse2 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse5 (* .cse4 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse2 |c_ULTIMATE.start_main_~b~0#1|) 0)) .cse3 (< .cse4 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (= (+ .cse0 .cse5 .cse1) (+ |c_ULTIMATE.start_main_~a~0#1| (* .cse4 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse4 |c_ULTIMATE.start_main_~s~0#1|))) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (<= (+ |c_ULTIMATE.start_main_~b~0#1| .cse5) |c_ULTIMATE.start_main_~a~0#1|))))) (let ((.cse9 (+ (* |c_ULTIMATE.start_main_~b~0#1| 2) .cse6 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse8 (div .cse9 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse7 (* .cse8 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| (* 2 |c_ULTIMATE.start_main_~b~0#1|)) .cse3 (= (+ .cse7 .cse0 .cse1) (+ (* .cse8 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse8 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (<= (+ .cse7 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~a~0#1|) (not (= (mod .cse9 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse8 (+ 2 |c_ULTIMATE.start_main_~k~0#1|)))))))) is different from true [2021-11-25 18:30:03,091 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (and (or (not (= (+ (* |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~c~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (let ((.cse2 (+ (* |c_ULTIMATE.start_main_~c~0#1| (- 1)) |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse3 (div .cse2 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse4 (* .cse3 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse2 |c_ULTIMATE.start_main_~b~0#1|) 0)) (= |c_ULTIMATE.start_main_~b~0#1| 0) (< .cse3 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (= (+ .cse0 .cse4 .cse1) (+ |c_ULTIMATE.start_main_~a~0#1| (* .cse3 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse3 |c_ULTIMATE.start_main_~s~0#1|))) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (<= (+ |c_ULTIMATE.start_main_~b~0#1| .cse4) |c_ULTIMATE.start_main_~a~0#1|))))))) is different from true [2021-11-25 18:30:07,644 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:30:14,218 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:30:16,527 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:30:25,694 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 |c_ULTIMATE.start_main_~y~0#1|)) (.cse4 (= |c_ULTIMATE.start_main_~b~0#1| 0)) (.cse7 (* |c_ULTIMATE.start_main_~c~0#1| (- 1))) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse8 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse12 (* |c_ULTIMATE.start_main_~b~0#1| 2))) (and (<= 0 |c_ULTIMATE.start_main_~b~0#1|) (or (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (<= |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~c~0#1|)) (= |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~y~0#1|) (< |c_ULTIMATE.start_main_~b~0#1| |c_ULTIMATE.start_main_~y~0#1|) (= |c_ULTIMATE.start_main_~q~0#1| 1) (= (+ .cse2 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) 0) (let ((.cse3 (+ .cse7 |c_ULTIMATE.start_main_~a~0#1| |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse5 (div .cse3 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse6 (* .cse5 |c_ULTIMATE.start_main_~b~0#1|))) (or (not (= (mod .cse3 |c_ULTIMATE.start_main_~b~0#1|) 0)) .cse4 (< .cse5 (+ |c_ULTIMATE.start_main_~k~0#1| 1)) (= (+ .cse0 .cse6 .cse1) (+ |c_ULTIMATE.start_main_~a~0#1| (* .cse5 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse5 |c_ULTIMATE.start_main_~s~0#1|))) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~b~0#1|) (<= (+ |c_ULTIMATE.start_main_~b~0#1| .cse6) |c_ULTIMATE.start_main_~a~0#1|))))) (= |c_ULTIMATE.start_main_~x~0#1| (+ .cse2 |c_ULTIMATE.start_main_~b~0#1|)) (let ((.cse11 (+ .cse12 .cse7 |c_ULTIMATE.start_main_~a~0#1|))) (let ((.cse10 (div .cse11 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse9 (* .cse10 |c_ULTIMATE.start_main_~b~0#1|))) (or (< |c_ULTIMATE.start_main_~c~0#1| .cse8) .cse4 (= (+ .cse9 .cse0 .cse1) (+ (* .cse10 |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| .cse10 |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (<= (+ .cse9 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~a~0#1|) (not (= (mod .cse11 |c_ULTIMATE.start_main_~b~0#1|) 0)) (< .cse10 (+ 2 |c_ULTIMATE.start_main_~k~0#1|)))))) (let ((.cse14 (div .cse12 |c_ULTIMATE.start_main_~b~0#1|))) (let ((.cse13 (* .cse14 |c_ULTIMATE.start_main_~b~0#1|))) (or (<= (+ .cse13 |c_ULTIMATE.start_main_~b~0#1|) |c_ULTIMATE.start_main_~a~0#1|) (= (+ .cse13 .cse0 .cse1) (+ (* |c_ULTIMATE.start_main_~y~0#1| .cse14 |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| .cse14 |c_ULTIMATE.start_main_~q~0#1|) |c_ULTIMATE.start_main_~a~0#1|)) (< |c_ULTIMATE.start_main_~a~0#1| .cse8)))))) is different from true [2021-11-25 18:30:34,787 WARN L227 SmtUtils]: Spent 6.47s on a formula simplification. DAG size of input: 66 DAG size of output: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:30:36,946 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:31:02,606 WARN L227 SmtUtils]: Spent 25.51s 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) [2021-11-25 18:31:04,617 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:31:06,620 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:31:19,876 WARN L227 SmtUtils]: Spent 8.23s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:31:22,048 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:31:53,058 WARN L227 SmtUtils]: Spent 23.57s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:31:56,178 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:32:01,624 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:33:07,944 WARN L227 SmtUtils]: Spent 54.94s on a formula simplification that was a NOOP. DAG size: 80 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:33:08,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:33:08,004 INFO L93 Difference]: Finished difference Result 254 states and 322 transitions. [2021-11-25 18:33:08,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 18:33:08,005 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) Word has length 107 [2021-11-25 18:33:08,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:33:08,008 INFO L225 Difference]: With dead ends: 254 [2021-11-25 18:33:08,008 INFO L226 Difference]: Without dead ends: 252 [2021-11-25 18:33:08,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 260 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 2113 ImplicationChecksByTransitivity, 290.8s TimeCoverageRelationStatistics Valid=632, Invalid=3651, Unknown=23, NotChecked=524, Total=4830 [2021-11-25 18:33:08,012 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 59 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 153 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 29.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:33:08,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 383 Invalid, 758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 571 Invalid, 11 Unknown, 23 Unchecked, 29.3s Time] [2021-11-25 18:33:08,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-25 18:33:08,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 241. [2021-11-25 18:33:08,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 137 states have (on average 1.1167883211678833) internal successors, (153), 140 states have internal predecessors, (153), 77 states have call successors, (77), 26 states have call predecessors, (77), 26 states have return successors, (76), 74 states have call predecessors, (76), 76 states have call successors, (76) [2021-11-25 18:33:08,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 306 transitions. [2021-11-25 18:33:08,127 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 306 transitions. Word has length 107 [2021-11-25 18:33:08,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:33:08,128 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 306 transitions. [2021-11-25 18:33:08,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 19 states have internal predecessors, (40), 13 states have call successors, (38), 2 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 13 states have call successors, (36) [2021-11-25 18:33:08,129 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 306 transitions. [2021-11-25 18:33:08,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 18:33:08,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:33:08,132 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] [2021-11-25 18:33:08,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:33:08,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:08,348 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:33:08,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:33:08,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 4 times [2021-11-25 18:33:08,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:33:08,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008400327] [2021-11-25 18:33:08,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:33:08,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:33:08,366 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:33:08,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [140140897] [2021-11-25 18:33:08,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:33:08,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:33:08,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:33:08,376 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:33:08,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2795f6c3-e2d4-4e66-84ce-f7aa07f710f6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:33:08,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:33:08,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 18:33:08,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:33:10,272 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 137 proven. 95 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-25 18:33:10,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:33:51,755 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 146 proven. 51 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-11-25 18:33:51,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:33:51,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008400327] [2021-11-25 18:33:51,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:33:51,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140140897] [2021-11-25 18:33:51,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140140897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:33:51,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [908725633] [2021-11-25 18:33:51,757 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 18:33:51,757 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:33:51,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:33:51,758 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:33:51,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:33:57,498 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2021-11-25 18:33:57,508 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 18:33:57,524 INFO L180 IcfgInterpreter]: Interpretation finished