./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V --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 fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:06:52,289 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:06:52,291 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:06:52,342 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:06:52,343 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:06:52,344 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:06:52,346 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:06:52,348 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:06:52,350 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:06:52,351 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:06:52,353 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:06:52,354 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:06:52,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:06:52,356 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:06:52,357 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:06:52,359 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:06:52,360 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:06:52,361 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:06:52,364 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:06:52,367 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:06:52,369 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:06:52,375 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:06:52,376 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:06:52,377 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:06:52,381 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:06:52,382 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:06:52,382 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:06:52,383 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:06:52,384 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:06:52,385 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:06:52,385 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:06:52,392 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:06:52,393 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:06:52,394 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:06:52,395 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:06:52,396 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:06:52,396 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:06:52,397 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:06:52,397 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:06:52,398 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:06:52,399 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:06:52,401 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:06:52,452 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:06:52,452 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:06:52,453 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:06:52,453 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:06:52,454 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:06:52,454 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:06:52,454 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:06:52,454 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:06:52,455 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:06:52,455 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:06:52,456 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:06:52,456 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:06:52,457 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:06:52,457 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:06:52,457 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:06:52,457 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:06:52,458 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:06:52,458 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:06:52,458 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:06:52,459 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:06:52,459 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:06:52,459 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:06:52,459 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:06:52,459 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:06:52,460 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:06:52,460 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:06:52,462 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:06:52,462 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:06:52,462 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:06:52,463 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:06:52,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:06:52,463 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:06:52,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:06:52,464 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:06:52,464 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:06:52,464 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:06:52,464 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:06:52,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:06:52,464 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:06:52,465 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:06:52,465 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:06:52,465 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_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 [2021-11-23 03:06:52,711 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:06:52,732 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:06:52,734 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:06:52,744 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:06:52,745 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:06:52,747 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2021-11-23 03:06:52,830 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/data/58b3cfd01/24218bac936a4760b400c876abdf220f/FLAG41a1d5598 [2021-11-23 03:06:53,263 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:06:53,267 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2021-11-23 03:06:53,277 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/data/58b3cfd01/24218bac936a4760b400c876abdf220f/FLAG41a1d5598 [2021-11-23 03:06:53,628 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/data/58b3cfd01/24218bac936a4760b400c876abdf220f [2021-11-23 03:06:53,631 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:06:53,646 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:06:53,648 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:06:53,648 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:06:53,651 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:06:53,652 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,653 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bc49212 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53, skipping insertion in model container [2021-11-23 03:06:53,654 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,661 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:06:53,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:06:53,850 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_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2021-11-23 03:06:53,871 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:06:53,879 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:06:53,892 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_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2021-11-23 03:06:53,903 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:06:53,916 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:06:53,917 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53 WrapperNode [2021-11-23 03:06:53,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:06:53,918 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:06:53,919 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:06:53,919 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:06:53,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,934 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,954 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-23 03:06:53,955 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:06:53,955 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:06:53,956 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:06:53,956 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:06:53,964 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,967 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,982 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,990 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:53,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:06:53,994 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:06:53,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:06:53,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:06:53,995 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (1/1) ... [2021-11-23 03:06:54,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:06:54,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:54,026 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:06:54,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:06:54,082 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:06:54,083 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 03:06:54,084 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 03:06:54,084 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:06:54,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:06:54,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:06:54,084 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:06:54,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:06:54,152 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:06:54,154 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:06:54,349 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:06:54,369 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:06:54,370 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 03:06:54,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:06:54 BoogieIcfgContainer [2021-11-23 03:06:54,372 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:06:54,374 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:06:54,375 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:06:54,381 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:06:54,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:06:53" (1/3) ... [2021-11-23 03:06:54,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f69715a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:06:54, skipping insertion in model container [2021-11-23 03:06:54,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:53" (2/3) ... [2021-11-23 03:06:54,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f69715a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:06:54, skipping insertion in model container [2021-11-23 03:06:54,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:06:54" (3/3) ... [2021-11-23 03:06:54,385 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound50.c [2021-11-23 03:06:54,390 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:06:54,391 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:06:54,440 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:06:54,448 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 [2021-11-23 03:06:54,448 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:06:54,481 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) [2021-11-23 03:06:54,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 03:06:54,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:54,487 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] [2021-11-23 03:06:54,488 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:54,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:54,506 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-23 03:06:54,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:54,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712304068] [2021-11-23 03:06:54,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:54,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:54,656 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:54,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1475345747] [2021-11-23 03:06:54,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:54,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:54,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:54,660 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:54,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:06:54,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:54,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 03:06:54,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:06:54,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:06:54,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:54,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712304068] [2021-11-23 03:06:54,832 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:54,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475345747] [2021-11-23 03:06:54,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475345747] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:06:54,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:06:54,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:06:54,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942872267] [2021-11-23 03:06:54,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:54,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:06:54,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:54,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:06:54,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:06:54,874 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) [2021-11-23 03:06:54,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:54,906 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-23 03:06:54,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:06:54,909 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 [2021-11-23 03:06:54,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:54,918 INFO L225 Difference]: With dead ends: 49 [2021-11-23 03:06:54,918 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 03:06:54,921 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 [2021-11-23 03:06:54,925 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 [2021-11-23 03:06:54,927 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] [2021-11-23 03:06:54,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 03:06:54,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-23 03:06:54,965 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) [2021-11-23 03:06:54,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-23 03:06:54,968 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-23 03:06:54,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:54,970 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-23 03:06:54,971 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) [2021-11-23 03:06:54,971 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-23 03:06:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 03:06:54,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:54,973 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] [2021-11-23 03:06:55,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:55,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:55,195 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:55,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:55,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-23 03:06:55,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:55,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069424443] [2021-11-23 03:06:55,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:55,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:55,215 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:55,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1436282301] [2021-11-23 03:06:55,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:55,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:55,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:55,217 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:55,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:06:55,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:55,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:06:55,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:55,467 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:06:55,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:55,606 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:06:55,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:55,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069424443] [2021-11-23 03:06:55,606 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:55,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436282301] [2021-11-23 03:06:55,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436282301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:06:55,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544678272] [2021-11-23 03:06:55,629 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 03:06:55,629 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:55,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:55,640 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:55,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:56,981 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:06:57,010 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:57,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1544678272] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:06:57,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:06:57,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-23 03:06:57,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690163851] [2021-11-23 03:06:57,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:57,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:06:57,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:57,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:06:57,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:06:57,934 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) [2021-11-23 03:06:58,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:58,150 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-23 03:06:58,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:06:58,151 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 [2021-11-23 03:06:58,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:58,152 INFO L225 Difference]: With dead ends: 38 [2021-11-23 03:06:58,153 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 03:06:58,153 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 [2021-11-23 03:06:58,155 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2021-11-23 03:06:58,156 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] [2021-11-23 03:06:58,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 03:06:58,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-23 03:06:58,167 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) [2021-11-23 03:06:58,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-23 03:06:58,168 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-23 03:06:58,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:58,169 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-23 03:06:58,169 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) [2021-11-23 03:06:58,169 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-23 03:06:58,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:06:58,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:58,171 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] [2021-11-23 03:06:58,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:58,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-23 03:06:58,395 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:58,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:58,396 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-23 03:06:58,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:58,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114598872] [2021-11-23 03:06:58,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:58,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:58,414 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:58,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [998684972] [2021-11-23 03:06:58,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:58,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:58,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:58,416 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:58,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:06:58,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:58,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:06:58,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:58,572 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:06:58,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:58,668 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:06:58,669 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:58,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114598872] [2021-11-23 03:06:58,669 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:58,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998684972] [2021-11-23 03:06:58,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998684972] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:58,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:58,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-23 03:06:58,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218447478] [2021-11-23 03:06:58,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:58,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:06:58,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:58,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:06:58,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:06:58,673 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) [2021-11-23 03:06:58,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:58,726 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-23 03:06:58,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:06:58,727 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 [2021-11-23 03:06:58,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:58,730 INFO L225 Difference]: With dead ends: 36 [2021-11-23 03:06:58,730 INFO L226 Difference]: Without dead ends: 34 [2021-11-23 03:06:58,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:06:58,737 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 [2021-11-23 03:06:58,743 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] [2021-11-23 03:06:58,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-23 03:06:58,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-23 03:06:58,753 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) [2021-11-23 03:06:58,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-23 03:06:58,758 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-23 03:06:58,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:58,759 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-23 03:06:58,759 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) [2021-11-23 03:06:58,759 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-23 03:06:58,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:06:58,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:58,761 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] [2021-11-23 03:06:58,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:58,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:58,976 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:58,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:58,977 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-23 03:06:58,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:58,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299587694] [2021-11-23 03:06:58,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:58,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:58,996 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:58,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [843590543] [2021-11-23 03:06:58,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:58,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:58,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:58,997 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:59,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:06:59,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:59,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:06:59,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:59,264 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:06:59,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:59,384 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:06:59,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:59,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299587694] [2021-11-23 03:06:59,388 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:59,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843590543] [2021-11-23 03:06:59,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843590543] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:59,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:59,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-23 03:06:59,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139857587] [2021-11-23 03:06:59,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:59,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:06:59,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:59,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:06:59,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:06:59,397 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) [2021-11-23 03:06:59,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:59,454 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-23 03:06:59,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:06:59,454 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 [2021-11-23 03:06:59,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:59,456 INFO L225 Difference]: With dead ends: 47 [2021-11-23 03:06:59,456 INFO L226 Difference]: Without dead ends: 45 [2021-11-23 03:06:59,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:06:59,462 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 [2021-11-23 03:06:59,463 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] [2021-11-23 03:06:59,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-23 03:06:59,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-23 03:06:59,485 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) [2021-11-23 03:06:59,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-23 03:06:59,488 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-23 03:06:59,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:59,489 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-23 03:06:59,489 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) [2021-11-23 03:06:59,489 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-23 03:06:59,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 03:06:59,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:59,493 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] [2021-11-23 03:06:59,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:59,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:59,706 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:59,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:59,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-23 03:06:59,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:59,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647069575] [2021-11-23 03:06:59,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:59,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:59,720 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:59,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1581258781] [2021-11-23 03:06:59,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:59,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:59,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:59,722 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:59,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:06:59,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:59,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:06:59,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:59,944 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:06:59,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:59,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:59,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647069575] [2021-11-23 03:06:59,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:59,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581258781] [2021-11-23 03:06:59,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581258781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:59,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2015830221] [2021-11-23 03:06:59,999 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-23 03:07:00,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:00,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:00,000 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:00,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:01,114 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-23 03:07:01,129 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:07:01,148 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:02,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2015830221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:02,468 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:02,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-23 03:07:02,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111808737] [2021-11-23 03:07:02,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:02,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:07:02,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:02,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:07:02,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:07:02,470 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) [2021-11-23 03:07:02,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:02,860 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-23 03:07:02,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:07:02,860 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 [2021-11-23 03:07:02,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:02,862 INFO L225 Difference]: With dead ends: 65 [2021-11-23 03:07:02,862 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 03:07:02,862 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 [2021-11-23 03:07:02,863 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, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:02,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 47 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:07:02,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 03:07:02,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-23 03:07:02,876 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) [2021-11-23 03:07:02,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-23 03:07:02,878 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-23 03:07:02,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:02,878 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-23 03:07:02,878 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) [2021-11-23 03:07:02,878 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-23 03:07:02,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 03:07:02,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:02,880 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] [2021-11-23 03:07:02,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 03:07:03,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:03,102 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:03,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:03,103 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-23 03:07:03,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:03,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808830052] [2021-11-23 03:07:03,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:03,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:03,115 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:03,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [623849757] [2021-11-23 03:07:03,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:03,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:03,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:03,117 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:03,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:07:03,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:03,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:07:03,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:03,311 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 03:07:03,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:03,448 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 03:07:03,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:03,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808830052] [2021-11-23 03:07:03,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:03,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623849757] [2021-11-23 03:07:03,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623849757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:07:03,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080985186] [2021-11-23 03:07:03,452 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:07:03,452 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:03,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:03,453 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:03,453 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:19,385 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2021-11-23 03:07:19,391 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:07:19,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:22,599 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 [2021-11-23 03:07:22,600 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:22,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:07:22,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-11-23 03:07:22,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156905276] [2021-11-23 03:07:22,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:22,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:07:22,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:22,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:07:22,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:07:22,602 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) [2021-11-23 03:07:22,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:22,790 INFO L93 Difference]: Finished difference Result 103 states and 142 transitions. [2021-11-23 03:07:22,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:07:22,790 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 [2021-11-23 03:07:22,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:22,792 INFO L225 Difference]: With dead ends: 103 [2021-11-23 03:07:22,792 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 03:07:22,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:07:22,794 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 [2021-11-23 03:07:22,794 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] [2021-11-23 03:07:22,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 03:07:22,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2021-11-23 03:07:22,814 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) [2021-11-23 03:07:22,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-23 03:07:22,821 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 52 [2021-11-23 03:07:22,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:22,822 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-23 03:07:22,822 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) [2021-11-23 03:07:22,822 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-23 03:07:22,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 03:07:22,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:22,824 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] [2021-11-23 03:07:22,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 03:07:23,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:07:23,024 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:23,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:23,025 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2021-11-23 03:07:23,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:23,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861060855] [2021-11-23 03:07:23,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:23,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:23,036 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:23,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [940683235] [2021-11-23 03:07:23,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:23,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:23,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:23,038 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:23,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:07:23,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:23,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:07:23,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:23,236 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 03:07:23,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:23,410 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 03:07:23,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:23,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861060855] [2021-11-23 03:07:23,411 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:23,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940683235] [2021-11-23 03:07:23,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940683235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:07:23,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [464881337] [2021-11-23 03:07:23,414 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:07:23,414 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:23,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:23,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:23,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:37,210 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-23 03:07:37,224 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:07:37,240 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:41,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [464881337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:41,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:07:41,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [8, 8] total 24 [2021-11-23 03:07:41,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435270239] [2021-11-23 03:07:41,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:41,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:07:41,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:41,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:07:41,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:07:41,469 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) [2021-11-23 03:07:42,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:42,999 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-23 03:07:42,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 03:07:42,999 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 [2021-11-23 03:07:43,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:43,001 INFO L225 Difference]: With dead ends: 105 [2021-11-23 03:07:43,002 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 03:07:43,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 133 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:07:43,003 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, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:43,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 50 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:07:43,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 03:07:43,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 03:07:43,026 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) [2021-11-23 03:07:43,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 138 transitions. [2021-11-23 03:07:43,028 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 138 transitions. Word has length 58 [2021-11-23 03:07:43,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:43,028 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 138 transitions. [2021-11-23 03:07:43,029 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) [2021-11-23 03:07:43,029 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 138 transitions. [2021-11-23 03:07:43,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:07:43,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:43,030 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] [2021-11-23 03:07:43,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:43,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:07:43,250 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:43,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:43,251 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-23 03:07:43,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:43,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88086404] [2021-11-23 03:07:43,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:43,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:43,258 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:43,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1049550081] [2021-11-23 03:07:43,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:43,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:43,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:43,259 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:43,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:07:43,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:43,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:07:43,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:43,426 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 03:07:43,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:43,563 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 03:07:43,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:43,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88086404] [2021-11-23 03:07:43,563 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:43,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049550081] [2021-11-23 03:07:43,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049550081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:07:43,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901028326] [2021-11-23 03:07:43,566 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:07:43,566 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:43,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:43,567 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:43,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:53,650 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2021-11-23 03:07:53,662 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:07:53,678 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:57,530 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 [2021-11-23 03:07:57,530 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:57,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:07:57,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-23 03:07:57,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340745353] [2021-11-23 03:07:57,530 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:57,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:07:57,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:57,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:07:57,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:07:57,532 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) [2021-11-23 03:07:57,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:57,681 INFO L93 Difference]: Finished difference Result 117 states and 153 transitions. [2021-11-23 03:07:57,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:07:57,682 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 [2021-11-23 03:07:57,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:57,685 INFO L225 Difference]: With dead ends: 117 [2021-11-23 03:07:57,685 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 03:07:57,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 143 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:07:57,687 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 [2021-11-23 03:07:57,687 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] [2021-11-23 03:07:57,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 03:07:57,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-23 03:07:57,711 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) [2021-11-23 03:07:57,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 151 transitions. [2021-11-23 03:07:57,713 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 151 transitions. Word has length 60 [2021-11-23 03:07:57,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:57,713 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 151 transitions. [2021-11-23 03:07:57,714 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) [2021-11-23 03:07:57,714 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 151 transitions. [2021-11-23 03:07:57,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:07:57,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:57,716 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] [2021-11-23 03:07:57,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:57,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:57,936 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:57,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:57,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-23 03:07:57,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:57,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186485357] [2021-11-23 03:07:57,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:57,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:57,945 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:57,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [431218443] [2021-11-23 03:07:57,946 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:07:57,946 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:57,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:57,950 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:57,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:07:57,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:07:57,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:07:57,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:07:58,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:58,174 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-23 03:07:58,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:58,345 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-23 03:07:58,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:58,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186485357] [2021-11-23 03:07:58,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:58,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431218443] [2021-11-23 03:07:58,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431218443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:07:58,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064964152] [2021-11-23 03:07:58,348 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:07:58,348 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:58,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:58,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:58,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:04,724 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-23 03:08:04,810 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:08:04,827 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:07,984 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 [2021-11-23 03:08:07,984 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:07,984 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:08:07,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-23 03:08:07,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29321235] [2021-11-23 03:08:07,985 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:07,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:08:07,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:07,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:08:07,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:08:07,987 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) [2021-11-23 03:08:08,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:08,203 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2021-11-23 03:08:08,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:08:08,204 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 [2021-11-23 03:08:08,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:08,205 INFO L225 Difference]: With dead ends: 122 [2021-11-23 03:08:08,206 INFO L226 Difference]: Without dead ends: 120 [2021-11-23 03:08:08,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:08:08,207 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:08,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 128 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:08:08,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-23 03:08:08,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-23 03:08:08,231 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) [2021-11-23 03:08:08,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2021-11-23 03:08:08,232 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2021-11-23 03:08:08,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:08,233 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2021-11-23 03:08:08,233 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) [2021-11-23 03:08:08,233 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2021-11-23 03:08:08,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 03:08:08,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:08,235 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] [2021-11-23 03:08:08,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:08,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:08,450 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:08,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:08,451 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-23 03:08:08,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:08,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121525965] [2021-11-23 03:08:08,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:08,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:08,459 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:08,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [595779964] [2021-11-23 03:08:08,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:08,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:08,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:08,462 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:08,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:08:08,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:08,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 03:08:08,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:09,106 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-23 03:08:09,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:09,687 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-23 03:08:09,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:09,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121525965] [2021-11-23 03:08:09,687 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:09,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595779964] [2021-11-23 03:08:09,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595779964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:08:09,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [799885637] [2021-11-23 03:08:09,690 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 03:08:09,690 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:09,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:09,691 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:09,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:13,740 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-23 03:08:13,743 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:08:13,756 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:50,071 WARN L227 SmtUtils]: Spent 32.58s 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) [2021-11-23 03:09:16,257 WARN L227 SmtUtils]: Spent 24.83s 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) [2021-11-23 03:09:26,039 WARN L227 SmtUtils]: Spent 5.97s 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) [2021-11-23 03:09:45,175 WARN L227 SmtUtils]: Spent 18.02s 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) [2021-11-23 03:10:09,965 WARN L227 SmtUtils]: Spent 19.68s on a formula simplification. DAG size of input: 183 DAG size of output: 92 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:10:09,966 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 [2021-11-23 03:10:09,966 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:10:09,966 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:10:09,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-23 03:10:09,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782142269] [2021-11-23 03:10:09,966 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:10:09,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:10:09,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:09,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:10:09,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1152, Unknown=1, NotChecked=0, Total=1332 [2021-11-23 03:10:09,968 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) [2021-11-23 03:10:23,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:23,176 INFO L93 Difference]: Finished difference Result 203 states and 282 transitions. [2021-11-23 03:10:23,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:10:23,176 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 [2021-11-23 03:10:23,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:23,180 INFO L225 Difference]: With dead ends: 203 [2021-11-23 03:10:23,180 INFO L226 Difference]: Without dead ends: 201 [2021-11-23 03:10:23,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 122.7s TimeCoverageRelationStatistics Valid=412, Invalid=2667, Unknown=1, NotChecked=0, Total=3080 [2021-11-23 03:10:23,183 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 65 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s 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, 7.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:23,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 426 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2021-11-23 03:10:23,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-23 03:10:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 191. [2021-11-23 03:10:23,234 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) [2021-11-23 03:10:23,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 269 transitions. [2021-11-23 03:10:23,237 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 269 transitions. Word has length 74 [2021-11-23 03:10:23,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:23,238 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 269 transitions. [2021-11-23 03:10:23,238 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) [2021-11-23 03:10:23,238 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 269 transitions. [2021-11-23 03:10:23,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 03:10:23,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:23,240 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] [2021-11-23 03:10:23,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:23,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:10:23,454 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:23,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:23,455 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-23 03:10:23,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:23,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127769259] [2021-11-23 03:10:23,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:23,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:23,463 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:10:23,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [759751276] [2021-11-23 03:10:23,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:23,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:23,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:23,474 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:23,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:10:23,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:23,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 03:10:23,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:23,901 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-23 03:10:23,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:10:24,142 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-23 03:10:24,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127769259] [2021-11-23 03:10:24,143 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:10:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759751276] [2021-11-23 03:10:24,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759751276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:10:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605778975] [2021-11-23 03:10:24,146 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 03:10:24,146 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:10:24,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:10:24,146 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:10:24,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:10:29,191 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-23 03:10:29,194 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:10:29,208 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:11:08,723 WARN L227 SmtUtils]: Spent 30.09s 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) [2021-11-23 03:11:25,695 WARN L227 SmtUtils]: Spent 16.68s 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) [2021-11-23 03:11:44,678 WARN L227 SmtUtils]: Spent 16.28s 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) [2021-11-23 03:12:06,444 WARN L227 SmtUtils]: Spent 21.14s 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) [2021-11-23 03:12:45,221 WARN L227 SmtUtils]: Spent 36.84s on a formula simplification. DAG size of input: 183 DAG size of output: 92 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:12:45,854 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 [2021-11-23 03:12:45,855 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:12:45,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:12:45,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-23 03:12:45,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437090840] [2021-11-23 03:12:45,855 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:12:45,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 03:12:45,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:12:45,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 03:12:45,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1089, Unknown=1, NotChecked=0, Total=1260 [2021-11-23 03:12:45,857 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) [2021-11-23 03:12:46,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:12:46,961 INFO L93 Difference]: Finished difference Result 224 states and 306 transitions. [2021-11-23 03:12:46,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:12:46,962 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 [2021-11-23 03:12:46,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:12:46,964 INFO L225 Difference]: With dead ends: 224 [2021-11-23 03:12:46,965 INFO L226 Difference]: Without dead ends: 218 [2021-11-23 03:12:46,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 203 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 137.2s TimeCoverageRelationStatistics Valid=238, Invalid=1653, Unknown=1, NotChecked=0, Total=1892 [2021-11-23 03:12:46,968 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 36 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:12:46,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 383 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:12:46,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-23 03:12:47,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 216. [2021-11-23 03:12:47,034 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) [2021-11-23 03:12:47,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 291 transitions. [2021-11-23 03:12:47,037 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 291 transitions. Word has length 79 [2021-11-23 03:12:47,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:12:47,038 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 291 transitions. [2021-11-23 03:12:47,038 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) [2021-11-23 03:12:47,039 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 291 transitions. [2021-11-23 03:12:47,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 03:12:47,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:47,041 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] [2021-11-23 03:12:47,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:12:47,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:12:47,266 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:47,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:47,267 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-23 03:12:47,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:12:47,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155699670] [2021-11-23 03:12:47,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:47,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:12:47,277 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:12:47,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [504341583] [2021-11-23 03:12:47,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:47,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:12:47,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:12:47,279 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:12:47,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:12:47,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:47,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 03:12:47,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-23 03:12:48,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:54,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:12:54,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155699670] [2021-11-23 03:12:54,453 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:12:54,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504341583] [2021-11-23 03:12:54,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504341583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:12:54,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890791285] [2021-11-23 03:12:54,456 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:12:54,456 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:12:54,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:12:54,457 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:12:54,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:12:59,138 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-23 03:12:59,146 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:12:59,160 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:13:50,303 WARN L227 SmtUtils]: Spent 35.88s 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) [2021-11-23 03:13:58,855 WARN L227 SmtUtils]: Spent 8.03s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:14:19,142 WARN L227 SmtUtils]: Spent 7.92s 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) [2021-11-23 03:14:19,415 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 [2021-11-23 03:14:19,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:14:19,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:14:19,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-23 03:14:19,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418842206] [2021-11-23 03:14:19,416 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:14:19,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:14:19,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:19,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:14:19,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1083, Unknown=6, NotChecked=0, Total=1260 [2021-11-23 03:14:19,417 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) [2021-11-23 03:14:20,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:20,046 INFO L93 Difference]: Finished difference Result 228 states and 301 transitions. [2021-11-23 03:14:20,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:14:20,047 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 [2021-11-23 03:14:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:20,050 INFO L225 Difference]: With dead ends: 228 [2021-11-23 03:14:20,050 INFO L226 Difference]: Without dead ends: 226 [2021-11-23 03:14:20,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 171 SyntacticMatches, 14 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 86.2s TimeCoverageRelationStatistics Valid=194, Invalid=1282, Unknown=6, NotChecked=0, Total=1482 [2021-11-23 03:14:20,052 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 21 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:20,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 233 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:14:20,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-23 03:14:20,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 224. [2021-11-23 03:14:20,108 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) [2021-11-23 03:14:20,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 297 transitions. [2021-11-23 03:14:20,111 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 297 transitions. Word has length 90 [2021-11-23 03:14:20,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:20,112 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 297 transitions. [2021-11-23 03:14:20,112 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) [2021-11-23 03:14:20,112 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 297 transitions. [2021-11-23 03:14:20,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 03:14:20,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:20,114 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] [2021-11-23 03:14:20,142 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-23 03:14:20,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:14:20,322 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:20,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:20,323 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-23 03:14:20,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:20,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686984320] [2021-11-23 03:14:20,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:20,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:20,334 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:20,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [320010698] [2021-11-23 03:14:20,334 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:14:20,334 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:20,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:20,336 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:20,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:14:20,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:14:20,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:14:20,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:14:20,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:20,541 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-23 03:14:20,541 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:14:20,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:20,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686984320] [2021-11-23 03:14:20,541 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:20,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320010698] [2021-11-23 03:14:20,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320010698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:20,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:14:20,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:14:20,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308365006] [2021-11-23 03:14:20,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:20,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:14:20,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:20,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:14:20,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:14:20,543 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) [2021-11-23 03:14:20,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:20,657 INFO L93 Difference]: Finished difference Result 306 states and 407 transitions. [2021-11-23 03:14:20,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:14:20,658 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 [2021-11-23 03:14:20,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:20,660 INFO L225 Difference]: With dead ends: 306 [2021-11-23 03:14:20,660 INFO L226 Difference]: Without dead ends: 209 [2021-11-23 03:14:20,662 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 [2021-11-23 03:14:20,663 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:20,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:14:20,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-23 03:14:20,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 184. [2021-11-23 03:14:20,706 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) [2021-11-23 03:14:20,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-23 03:14:20,708 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-23 03:14:20,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:20,708 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-23 03:14:20,709 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) [2021-11-23 03:14:20,709 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-23 03:14:20,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-23 03:14:20,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:20,711 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] [2021-11-23 03:14:20,735 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 03:14:20,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:14:20,912 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:20,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:20,912 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-23 03:14:20,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:20,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337181543] [2021-11-23 03:14:20,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:20,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:20,924 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:20,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [995737327] [2021-11-23 03:14:20,924 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:14:20,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:20,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:20,933 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:20,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:14:21,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:14:21,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:14:21,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:14:21,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:21,350 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-23 03:14:21,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:21,674 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-23 03:14:21,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:21,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337181543] [2021-11-23 03:14:21,675 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:21,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995737327] [2021-11-23 03:14:21,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995737327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:21,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1424218041] [2021-11-23 03:14:21,677 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:14:21,678 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:21,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:21,678 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:21,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:25,439 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2021-11-23 03:14:25,447 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:14:25,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:59,539 WARN L227 SmtUtils]: Spent 27.81s 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) [2021-11-23 03:15:12,497 WARN L227 SmtUtils]: Spent 12.06s 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) [2021-11-23 03:15:31,634 WARN L227 SmtUtils]: Spent 14.20s 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) [2021-11-23 03:15:31,912 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 [2021-11-23 03:15:31,913 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:15:31,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:15:31,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-23 03:15:31,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075321349] [2021-11-23 03:15:31,913 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:15:31,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:15:31,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:31,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:15:31,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=967, Unknown=1, NotChecked=0, Total=1122 [2021-11-23 03:15:31,916 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) [2021-11-23 03:15:34,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:34,859 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-23 03:15:34,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:15:34,860 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 [2021-11-23 03:15:34,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:34,862 INFO L225 Difference]: With dead ends: 230 [2021-11-23 03:15:34,862 INFO L226 Difference]: Without dead ends: 228 [2021-11-23 03:15:34,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 265 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 68.7s TimeCoverageRelationStatistics Valid=215, Invalid=1506, Unknown=1, NotChecked=0, Total=1722 [2021-11-23 03:15:34,863 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 38 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:34,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 291 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:15:34,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-23 03:15:34,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-23 03:15:34,912 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) [2021-11-23 03:15:34,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-23 03:15:34,914 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-23 03:15:34,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:34,914 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-23 03:15:34,915 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) [2021-11-23 03:15:34,915 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-23 03:15:34,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 03:15:34,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:34,917 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] [2021-11-23 03:15:34,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:35,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:35,130 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:35,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:35,131 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-23 03:15:35,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:35,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732050174] [2021-11-23 03:15:35,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:35,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:35,144 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:15:35,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [178850098] [2021-11-23 03:15:35,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:15:35,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:35,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:35,151 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:35,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_979ca300-a935-44d4-a4a4-2b0a5b2bdebe/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:15:35,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:15:35,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:15:35,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 03:15:35,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:36,245 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-23 03:15:36,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:44,414 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 51 proven. 42 refuted. 6 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-23 03:15:44,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:44,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732050174] [2021-11-23 03:15:44,415 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:15:44,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178850098] [2021-11-23 03:15:44,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178850098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:44,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [12071374] [2021-11-23 03:15:44,417 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 03:15:44,417 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:15:44,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:15:44,418 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:15:44,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:15:48,778 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-23 03:15:48,787 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-23 03:15:48,803 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:26,680 WARN L227 SmtUtils]: Spent 32.93s 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) [2021-11-23 03:17:00,033 WARN L227 SmtUtils]: Spent 22.53s 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) [2021-11-23 03:17:23,418 WARN L227 SmtUtils]: Spent 20.87s 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) [2021-11-23 03:17:23,537 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 [2021-11-23 03:17:23,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:23,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:23,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-23 03:17:23,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374307014] [2021-11-23 03:17:23,537 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:23,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 03:17:23,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:23,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 03:17:23,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=1490, Unknown=4, NotChecked=0, Total=1722 [2021-11-23 03:17:23,540 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) [2021-11-23 03:17:49,644 WARN L227 SmtUtils]: Spent 24.44s 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) [2021-11-23 03:17:53,327 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 [] [2021-11-23 03:18:10,835 WARN L227 SmtUtils]: Spent 15.71s 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) [2021-11-23 03:18:14,770 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:18:34,983 WARN L227 SmtUtils]: Spent 12.13s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:18:36,988 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:18:40,684 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 (= |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|))) (= (+ .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|))) (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 [2021-11-23 03:18:42,691 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 [] [2021-11-23 03:20:12,258 WARN L227 SmtUtils]: Spent 1.48m on a formula simplification. DAG size of input: 83 DAG size of output: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:20:22,718 WARN L227 SmtUtils]: Spent 9.73s 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) [2021-11-23 03:20:32,360 WARN L227 SmtUtils]: Spent 7.43s 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) [2021-11-23 03:20:34,411 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:20:36,415 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:20:39,109 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:20:42,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:20:44,085 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 []