./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/half_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/half_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI --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 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 02:42:17,581 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:42:17,583 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:42:17,620 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:42:17,621 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:42:17,622 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:42:17,623 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:42:17,625 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:42:17,627 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:42:17,628 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:42:17,629 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:42:17,630 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:42:17,630 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:42:17,632 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:42:17,633 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:42:17,634 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:42:17,635 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:42:17,636 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:42:17,638 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:42:17,640 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:42:17,641 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:42:17,643 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:42:17,644 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:42:17,645 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:42:17,649 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:42:17,649 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:42:17,650 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:42:17,651 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:42:17,651 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:42:17,652 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:42:17,653 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:42:17,654 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:42:17,655 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:42:17,656 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:42:17,657 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:42:17,657 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:42:17,658 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:42:17,659 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:42:17,659 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:42:17,660 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:42:17,661 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:42:17,664 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:42:17,706 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:42:17,706 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:42:17,707 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:42:17,707 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:42:17,708 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:42:17,708 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:42:17,708 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:42:17,708 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:42:17,708 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:42:17,709 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:42:17,709 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:42:17,709 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:42:17,709 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:42:17,710 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:42:17,710 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:42:17,710 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:42:17,710 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:42:17,711 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:42:17,711 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:42:17,712 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:42:17,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:42:17,712 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:42:17,712 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:42:17,712 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:42:17,713 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:42:17,713 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:42:17,713 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:42:17,713 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:42:17,713 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:42:17,714 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:42:17,714 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:42:17,718 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:42:17,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:42:17,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:42:17,719 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:42:17,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:42:17,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:42:17,720 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:42:17,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:42:17,721 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:42:17,721 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:42:17,721 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2022-11-03 02:42:18,056 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:42:18,079 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:42:18,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:42:18,083 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:42:18,084 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:42:18,085 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/loop-invgen/half_2.i [2022-11-03 02:42:18,155 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/data/410b3ccbe/e40584ad6bfa4d09b3c077d12a45e3d8/FLAGe581e4a37 [2022-11-03 02:42:18,584 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:42:18,585 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/sv-benchmarks/c/loop-invgen/half_2.i [2022-11-03 02:42:18,592 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/data/410b3ccbe/e40584ad6bfa4d09b3c077d12a45e3d8/FLAGe581e4a37 [2022-11-03 02:42:18,990 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/data/410b3ccbe/e40584ad6bfa4d09b3c077d12a45e3d8 [2022-11-03 02:42:18,993 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:42:18,994 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:42:18,996 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:42:18,996 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:42:19,000 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:42:19,001 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:42:18" (1/1) ... [2022-11-03 02:42:19,002 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@725966ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19, skipping insertion in model container [2022-11-03 02:42:19,003 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:42:18" (1/1) ... [2022-11-03 02:42:19,010 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:42:19,028 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:42:19,267 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_7d825547-c157-4eef-bbcb-7510444b68f6/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-03 02:42:19,295 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:42:19,309 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:42:19,324 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_7d825547-c157-4eef-bbcb-7510444b68f6/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-03 02:42:19,334 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:42:19,350 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:42:19,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19 WrapperNode [2022-11-03 02:42:19,351 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:42:19,352 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:42:19,352 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:42:19,352 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:42:19,361 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,368 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,389 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-11-03 02:42:19,390 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:42:19,391 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:42:19,392 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:42:19,392 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:42:19,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,401 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,403 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,404 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,412 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,419 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,426 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:42:19,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:42:19,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:42:19,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:42:19,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (1/1) ... [2022-11-03 02:42:19,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:42:19,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:19,472 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:42:19,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:42:19,521 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:42:19,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:42:19,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:42:19,522 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:42:19,594 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:42:19,597 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:42:19,802 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:42:19,842 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:42:19,842 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 02:42:19,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:42:19 BoogieIcfgContainer [2022-11-03 02:42:19,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:42:19,861 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:42:19,861 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:42:19,865 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:42:19,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:42:18" (1/3) ... [2022-11-03 02:42:19,866 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@100ec6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:42:19, skipping insertion in model container [2022-11-03 02:42:19,866 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:42:19" (2/3) ... [2022-11-03 02:42:19,867 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@100ec6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:42:19, skipping insertion in model container [2022-11-03 02:42:19,867 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:42:19" (3/3) ... [2022-11-03 02:42:19,868 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2.i [2022-11-03 02:42:19,905 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:42:19,905 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:42:19,984 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:42:19,993 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@295472d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:42:19,993 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:42:19,999 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:20,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 02:42:20,012 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:20,014 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 02:42:20,014 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:20,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:20,023 INFO L85 PathProgramCache]: Analyzing trace with hash -2025251484, now seen corresponding path program 1 times [2022-11-03 02:42:20,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:20,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186649729] [2022-11-03 02:42:20,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:20,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:20,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:20,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:20,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:20,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186649729] [2022-11-03 02:42:20,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186649729] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:42:20,390 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:42:20,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:42:20,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873161374] [2022-11-03 02:42:20,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:42:20,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:42:20,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:20,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:42:20,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:42:20,446 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:20,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:20,531 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-11-03 02:42:20,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:42:20,553 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 02:42:20,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:20,565 INFO L225 Difference]: With dead ends: 26 [2022-11-03 02:42:20,566 INFO L226 Difference]: Without dead ends: 13 [2022-11-03 02:42:20,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:42:20,574 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:20,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 11 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:42:20,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-03 02:42:20,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-11-03 02:42:20,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:20,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-03 02:42:20,617 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 6 [2022-11-03 02:42:20,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:20,618 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-03 02:42:20,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:20,618 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-03 02:42:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 02:42:20,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:20,619 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:20,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:42:20,620 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:20,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:20,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1610042692, now seen corresponding path program 1 times [2022-11-03 02:42:20,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:20,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494134501] [2022-11-03 02:42:20,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:20,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:20,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:20,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:20,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:20,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494134501] [2022-11-03 02:42:20,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494134501] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:20,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155821159] [2022-11-03 02:42:20,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:20,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:20,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:20,899 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:20,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:42:20,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:20,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:42:20,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:21,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:21,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:21,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:21,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155821159] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:21,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27992259] [2022-11-03 02:42:21,381 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 02:42:21,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:21,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:21,390 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:21,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:21,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:21,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:21,898 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:21,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:21,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-03 02:42:21,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5937529] [2022-11-03 02:42:21,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:21,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:42:21,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:21,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:42:21,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-11-03 02:42:21,902 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:22,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:22,468 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-03 02:42:22,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 02:42:22,470 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 02:42:22,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:22,470 INFO L225 Difference]: With dead ends: 36 [2022-11-03 02:42:22,470 INFO L226 Difference]: Without dead ends: 34 [2022-11-03 02:42:22,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=159, Invalid=653, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:42:22,473 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 44 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:22,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 26 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:42:22,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-03 02:42:22,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 16. [2022-11-03 02:42:22,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:22,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-03 02:42:22,485 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 7 [2022-11-03 02:42:22,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:22,486 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-03 02:42:22,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:22,487 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-03 02:42:22,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 02:42:22,487 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:22,488 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:22,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-03 02:42:22,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:22,711 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:22,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:22,712 INFO L85 PathProgramCache]: Analyzing trace with hash 49336644, now seen corresponding path program 2 times [2022-11-03 02:42:22,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:22,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150027657] [2022-11-03 02:42:22,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:22,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:22,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:22,861 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:22,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:22,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150027657] [2022-11-03 02:42:22,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150027657] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:22,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643233283] [2022-11-03 02:42:22,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:42:22,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:22,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:22,867 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:22,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:42:22,923 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:42:22,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:22,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:42:22,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:23,006 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:23,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:23,124 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:23,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643233283] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:23,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1416209031] [2022-11-03 02:42:23,127 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 02:42:23,128 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:23,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:23,128 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:23,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:23,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:23,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:23,472 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:23,472 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:23,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-11-03 02:42:23,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430280666] [2022-11-03 02:42:23,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:23,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:42:23,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:23,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:42:23,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:42:23,474 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:23,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:23,876 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-11-03 02:42:23,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 02:42:23,877 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-03 02:42:23,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:23,878 INFO L225 Difference]: With dead ends: 46 [2022-11-03 02:42:23,878 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 02:42:23,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=885, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:42:23,880 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 43 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:23,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 54 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:42:23,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 02:42:23,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 16. [2022-11-03 02:42:23,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:23,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-03 02:42:23,888 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2022-11-03 02:42:23,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:23,888 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-03 02:42:23,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:23,889 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-03 02:42:23,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 02:42:23,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:23,890 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:23,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:24,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:24,119 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:24,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:24,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1438439610, now seen corresponding path program 1 times [2022-11-03 02:42:24,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:24,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767766415] [2022-11-03 02:42:24,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:24,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:24,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:24,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:24,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:24,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767766415] [2022-11-03 02:42:24,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767766415] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:24,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796257937] [2022-11-03 02:42:24,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:24,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:24,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:24,273 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:24,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:42:24,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:24,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:42:24,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:24,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:24,346 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:42:24,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796257937] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:42:24,346 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:42:24,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-11-03 02:42:24,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101138193] [2022-11-03 02:42:24,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:42:24,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:42:24,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:24,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:42:24,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:42:24,348 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:24,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:24,398 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-03 02:42:24,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:42:24,399 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-03 02:42:24,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:24,406 INFO L225 Difference]: With dead ends: 23 [2022-11-03 02:42:24,406 INFO L226 Difference]: Without dead ends: 16 [2022-11-03 02:42:24,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-11-03 02:42:24,411 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:24,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:42:24,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-03 02:42:24,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-03 02:42:24,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:24,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-03 02:42:24,427 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2022-11-03 02:42:24,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:24,427 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-03 02:42:24,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:24,428 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-03 02:42:24,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 02:42:24,429 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:24,429 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:42:24,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:24,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:24,643 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:24,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:24,643 INFO L85 PathProgramCache]: Analyzing trace with hash 543513786, now seen corresponding path program 1 times [2022-11-03 02:42:24,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:24,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570796758] [2022-11-03 02:42:24,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:24,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:24,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:24,863 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:24,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:24,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570796758] [2022-11-03 02:42:24,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570796758] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:24,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984076542] [2022-11-03 02:42:24,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:24,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:24,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:24,866 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:24,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:42:24,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:24,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 02:42:24,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:25,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:25,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:25,325 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:25,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984076542] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:25,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11042314] [2022-11-03 02:42:25,328 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:25,328 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:25,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:25,329 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:25,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:25,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:25,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:25,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:25,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:25,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-11-03 02:42:25,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203396164] [2022-11-03 02:42:25,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:25,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:42:25,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:25,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:42:25,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:42:25,925 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:26,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:26,638 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-11-03 02:42:26,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:42:26,639 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 02:42:26,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:26,640 INFO L225 Difference]: With dead ends: 42 [2022-11-03 02:42:26,640 INFO L226 Difference]: Without dead ends: 25 [2022-11-03 02:42:26,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:42:26,641 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:26,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 25 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:42:26,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-03 02:42:26,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2022-11-03 02:42:26,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:26,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-03 02:42:26,650 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-11-03 02:42:26,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:26,650 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-03 02:42:26,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:26,651 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-03 02:42:26,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 02:42:26,651 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:26,651 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 02:42:26,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:26,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:26,852 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:26,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:26,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1965317756, now seen corresponding path program 2 times [2022-11-03 02:42:26,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:26,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407584407] [2022-11-03 02:42:26,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:26,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:26,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:27,215 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:27,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:27,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407584407] [2022-11-03 02:42:27,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407584407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:27,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463077825] [2022-11-03 02:42:27,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:42:27,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:27,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:27,219 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:27,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:42:27,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:42:27,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:27,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:42:27,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:27,501 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:27,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:27,878 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:27,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463077825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:27,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522010401] [2022-11-03 02:42:27,880 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:27,880 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:27,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:27,881 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:27,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:28,014 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:28,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '837#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:28,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:28,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:28,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 26 [2022-11-03 02:42:28,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907284000] [2022-11-03 02:42:28,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:28,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:42:28,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:28,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:42:28,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:42:28,495 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:28,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:28,937 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-03 02:42:28,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:42:28,938 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-03 02:42:28,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:28,938 INFO L225 Difference]: With dead ends: 32 [2022-11-03 02:42:28,939 INFO L226 Difference]: Without dead ends: 18 [2022-11-03 02:42:28,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=209, Invalid=1351, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:42:28,940 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:28,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 37 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:42:28,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-03 02:42:28,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-11-03 02:42:28,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:28,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-03 02:42:28,961 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-03 02:42:28,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:28,961 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-03 02:42:28,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:28,961 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-03 02:42:28,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 02:42:28,962 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:28,962 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 02:42:29,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:29,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:29,175 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:29,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:29,175 INFO L85 PathProgramCache]: Analyzing trace with hash -772452956, now seen corresponding path program 3 times [2022-11-03 02:42:29,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:29,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164956188] [2022-11-03 02:42:29,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:29,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:29,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:29,319 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:29,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:29,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164956188] [2022-11-03 02:42:29,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164956188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:29,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859923498] [2022-11-03 02:42:29,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:42:29,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:29,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:29,323 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:29,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:42:29,375 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:42:29,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:29,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:42:29,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:29,482 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:29,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:29,627 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:29,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859923498] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:29,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443723137] [2022-11-03 02:42:29,629 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:29,629 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:29,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:29,630 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:29,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:29,780 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:30,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1046#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:30,169 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:30,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:30,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-03 02:42:30,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590247424] [2022-11-03 02:42:30,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:30,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:42:30,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:30,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:42:30,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:42:30,172 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:30,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:30,405 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2022-11-03 02:42:30,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:42:30,406 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 02:42:30,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:30,407 INFO L225 Difference]: With dead ends: 28 [2022-11-03 02:42:30,407 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 02:42:30,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:42:30,408 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:30,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 24 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:42:30,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 02:42:30,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-11-03 02:42:30,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:30,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-03 02:42:30,418 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2022-11-03 02:42:30,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:30,419 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-03 02:42:30,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:30,419 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-03 02:42:30,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:42:30,420 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:30,420 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-03 02:42:30,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:30,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:30,633 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:30,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:30,633 INFO L85 PathProgramCache]: Analyzing trace with hash 293585018, now seen corresponding path program 4 times [2022-11-03 02:42:30,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:30,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149845253] [2022-11-03 02:42:30,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:30,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:30,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:31,053 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:31,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:31,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149845253] [2022-11-03 02:42:31,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149845253] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:31,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483141070] [2022-11-03 02:42:31,054 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:42:31,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:31,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:31,059 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:31,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:42:31,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:31,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 02:42:31,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:31,343 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:31,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:31,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483141070] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:31,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834421362] [2022-11-03 02:42:31,867 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:31,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:31,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:31,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:31,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:31,981 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:32,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1279#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:32,374 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:32,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:32,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2022-11-03 02:42:32,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758188224] [2022-11-03 02:42:32,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:32,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 02:42:32,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:32,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 02:42:32,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:42:32,377 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:33,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:33,548 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-11-03 02:42:33,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-03 02:42:33,549 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-03 02:42:33,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:33,551 INFO L225 Difference]: With dead ends: 55 [2022-11-03 02:42:33,551 INFO L226 Difference]: Without dead ends: 38 [2022-11-03 02:42:33,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=401, Invalid=2461, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 02:42:33,553 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 55 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:33,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 46 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:42:33,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-03 02:42:33,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-03 02:42:33,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:33,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-03 02:42:33,577 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 19 [2022-11-03 02:42:33,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:33,577 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-03 02:42:33,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:33,577 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-03 02:42:33,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 02:42:33,578 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:33,578 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-03 02:42:33,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:33,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:33,803 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:33,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:33,803 INFO L85 PathProgramCache]: Analyzing trace with hash -486816316, now seen corresponding path program 5 times [2022-11-03 02:42:33,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:33,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123571064] [2022-11-03 02:42:33,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:33,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:33,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:34,353 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:34,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:34,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123571064] [2022-11-03 02:42:34,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123571064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:34,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299967120] [2022-11-03 02:42:34,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:42:34,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:34,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:34,359 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:34,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:42:34,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 02:42:34,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:34,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 02:42:34,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:34,821 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:34,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:35,575 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:35,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299967120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:35,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1277929490] [2022-11-03 02:42:35,587 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:35,587 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:35,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:35,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:35,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:35,723 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:36,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1633#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:36,213 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:36,213 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:36,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 38 [2022-11-03 02:42:36,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252289856] [2022-11-03 02:42:36,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:36,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 02:42:36,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:36,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 02:42:36,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=1667, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:42:36,221 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:37,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:37,072 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-11-03 02:42:37,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 02:42:37,073 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-03 02:42:37,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:37,073 INFO L225 Difference]: With dead ends: 51 [2022-11-03 02:42:37,073 INFO L226 Difference]: Without dead ends: 31 [2022-11-03 02:42:37,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=388, Invalid=2804, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:42:37,075 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:37,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 40 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:42:37,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-03 02:42:37,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-11-03 02:42:37,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:37,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-11-03 02:42:37,099 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2022-11-03 02:42:37,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:37,099 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-11-03 02:42:37,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 38 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:37,100 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-11-03 02:42:37,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 02:42:37,100 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:37,100 INFO L195 NwaCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-03 02:42:37,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:37,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:37,319 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:37,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:37,319 INFO L85 PathProgramCache]: Analyzing trace with hash -711895910, now seen corresponding path program 6 times [2022-11-03 02:42:37,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:37,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456044739] [2022-11-03 02:42:37,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:37,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:37,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:37,583 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:37,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:37,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456044739] [2022-11-03 02:42:37,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456044739] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:37,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045254435] [2022-11-03 02:42:37,584 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:42:37,584 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:37,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:37,587 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:37,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:42:37,641 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:42:37,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:37,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 02:42:37,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:37,913 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:37,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:38,206 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:38,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045254435] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:38,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530562752] [2022-11-03 02:42:38,208 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:38,208 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:38,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:38,209 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:38,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:38,322 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:38,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1973#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:38,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:38,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:38,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2022-11-03 02:42:38,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423551352] [2022-11-03 02:42:38,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:38,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-03 02:42:38,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:38,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-03 02:42:38,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1635, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:42:38,773 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:39,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:39,783 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-11-03 02:42:39,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:42:39,784 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-03 02:42:39,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:39,785 INFO L225 Difference]: With dead ends: 97 [2022-11-03 02:42:39,785 INFO L226 Difference]: Without dead ends: 95 [2022-11-03 02:42:39,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1185, Invalid=4365, Unknown=0, NotChecked=0, Total=5550 [2022-11-03 02:42:39,787 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 143 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:39,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 48 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:42:39,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-03 02:42:39,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 40. [2022-11-03 02:42:39,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:39,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-11-03 02:42:39,812 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2022-11-03 02:42:39,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:39,812 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-11-03 02:42:39,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:39,812 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-11-03 02:42:39,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-03 02:42:39,813 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:39,813 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-11-03 02:42:39,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:40,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:42:40,014 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:40,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:40,015 INFO L85 PathProgramCache]: Analyzing trace with hash 569136186, now seen corresponding path program 7 times [2022-11-03 02:42:40,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:40,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139460108] [2022-11-03 02:42:40,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:40,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:40,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:40,588 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:40,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:40,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139460108] [2022-11-03 02:42:40,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139460108] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:40,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385790743] [2022-11-03 02:42:40,589 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:42:40,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:40,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:40,591 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:40,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:42:40,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:40,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 02:42:40,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:41,019 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:41,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:41,805 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:41,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385790743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:41,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700715352] [2022-11-03 02:42:41,807 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:41,808 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:41,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:41,808 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:41,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:41,904 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:42,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2458#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:42,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:42,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:42,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2022-11-03 02:42:42,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551399310] [2022-11-03 02:42:42,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:42,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 02:42:42,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:42,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 02:42:42,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:42:42,390 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:44,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:44,248 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2022-11-03 02:42:44,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-03 02:42:44,249 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-03 02:42:44,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:44,250 INFO L225 Difference]: With dead ends: 124 [2022-11-03 02:42:44,250 INFO L226 Difference]: Without dead ends: 101 [2022-11-03 02:42:44,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=686, Invalid=4426, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:42:44,252 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 82 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:44,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 66 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:42:44,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-03 02:42:44,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 40. [2022-11-03 02:42:44,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:44,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-03 02:42:44,282 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 27 [2022-11-03 02:42:44,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:44,283 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-03 02:42:44,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:44,283 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-03 02:42:44,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:42:44,284 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:44,284 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-11-03 02:42:44,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:44,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:44,499 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:44,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:44,499 INFO L85 PathProgramCache]: Analyzing trace with hash 1681635844, now seen corresponding path program 8 times [2022-11-03 02:42:44,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:44,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341663536] [2022-11-03 02:42:44,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:44,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:44,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:45,164 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:45,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:45,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341663536] [2022-11-03 02:42:45,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341663536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:45,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40330991] [2022-11-03 02:42:45,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:42:45,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:45,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:45,165 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:45,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:42:45,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 02:42:45,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:45,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-03 02:42:45,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:45,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:46,908 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:46,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40330991] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:46,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1741326504] [2022-11-03 02:42:46,910 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:46,910 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:46,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:46,911 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:46,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:47,003 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:47,470 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3025#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:47,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:47,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:47,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 50 [2022-11-03 02:42:47,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894542669] [2022-11-03 02:42:47,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:47,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:42:47,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:47,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:42:47,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=2729, Unknown=0, NotChecked=0, Total=3080 [2022-11-03 02:42:47,473 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:49,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:49,031 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-11-03 02:42:49,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 02:42:49,032 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:42:49,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:49,033 INFO L225 Difference]: With dead ends: 69 [2022-11-03 02:42:49,033 INFO L226 Difference]: Without dead ends: 43 [2022-11-03 02:42:49,035 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=610, Invalid=4646, Unknown=0, NotChecked=0, Total=5256 [2022-11-03 02:42:49,036 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:49,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 52 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:42:49,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-03 02:42:49,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-11-03 02:42:49,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:49,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-03 02:42:49,056 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2022-11-03 02:42:49,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:49,056 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-03 02:42:49,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.76) internal successors, (88), 50 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:49,056 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-03 02:42:49,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:42:49,057 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:49,057 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-11-03 02:42:49,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:49,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:49,263 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:49,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:49,263 INFO L85 PathProgramCache]: Analyzing trace with hash 994514938, now seen corresponding path program 9 times [2022-11-03 02:42:49,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:49,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631766979] [2022-11-03 02:42:49,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:49,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:49,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:50,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:50,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631766979] [2022-11-03 02:42:50,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631766979] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:50,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153749467] [2022-11-03 02:42:50,108 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:42:50,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:50,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:50,109 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:50,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:42:50,174 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:42:50,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:42:50,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 02:42:50,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:50,637 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:50,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:51,760 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:51,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153749467] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:51,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [480679722] [2022-11-03 02:42:51,762 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:51,763 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:51,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:51,763 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:51,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:51,863 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:52,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3498#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:52,455 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:52,456 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:52,456 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2022-11-03 02:42:52,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137442880] [2022-11-03 02:42:52,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:52,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-03 02:42:52,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:52,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-03 02:42:52,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=2490, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 02:42:52,458 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:55,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:42:55,260 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2022-11-03 02:42:55,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-03 02:42:55,261 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-03 02:42:55,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:42:55,262 INFO L225 Difference]: With dead ends: 102 [2022-11-03 02:42:55,262 INFO L226 Difference]: Without dead ends: 73 [2022-11-03 02:42:55,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2051 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1055, Invalid=6955, Unknown=0, NotChecked=0, Total=8010 [2022-11-03 02:42:55,264 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 119 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:42:55,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 95 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:42:55,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-03 02:42:55,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 40. [2022-11-03 02:42:55,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:55,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-03 02:42:55,291 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-11-03 02:42:55,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:42:55,291 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-03 02:42:55,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:42:55,292 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-03 02:42:55,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 02:42:55,293 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:42:55,293 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-11-03 02:42:55,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:42:55,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:42:55,496 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:42:55,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:42:55,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1887470012, now seen corresponding path program 10 times [2022-11-03 02:42:55,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:42:55,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503942650] [2022-11-03 02:42:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:42:55,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:42:55,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:56,434 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:56,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:42:56,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503942650] [2022-11-03 02:42:56,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503942650] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:42:56,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621947771] [2022-11-03 02:42:56,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:42:56,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:42:56,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:42:56,436 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:42:56,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:42:56,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:42:56,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-03 02:42:56,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:42:57,091 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:57,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:42:58,425 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:42:58,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621947771] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:42:58,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667135630] [2022-11-03 02:42:58,426 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:42:58,427 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:42:58,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:42:58,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:42:58,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:42:58,525 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:42:59,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4096#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:42:59,143 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:42:59,143 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:42:59,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2022-11-03 02:42:59,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387448080] [2022-11-03 02:42:59,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:42:59,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-03 02:42:59,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:42:59,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-03 02:42:59,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2978, Unknown=0, NotChecked=0, Total=3422 [2022-11-03 02:42:59,147 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:02,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:02,519 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2022-11-03 02:43:02,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-03 02:43:02,519 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-11-03 02:43:02,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:02,520 INFO L225 Difference]: With dead ends: 110 [2022-11-03 02:43:02,520 INFO L226 Difference]: Without dead ends: 78 [2022-11-03 02:43:02,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2503 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1271, Invalid=8431, Unknown=0, NotChecked=0, Total=9702 [2022-11-03 02:43:02,523 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 130 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:02,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 115 Invalid, 1172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:43:02,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-03 02:43:02,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 53. [2022-11-03 02:43:02,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:02,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-11-03 02:43:02,558 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 39 [2022-11-03 02:43:02,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:02,558 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-11-03 02:43:02,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:02,559 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-11-03 02:43:02,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:43:02,560 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:02,560 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-03 02:43:02,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:02,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:43:02,775 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:02,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:02,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1574171718, now seen corresponding path program 11 times [2022-11-03 02:43:02,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:02,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774862402] [2022-11-03 02:43:02,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:02,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:02,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:03,844 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:03,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:03,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774862402] [2022-11-03 02:43:03,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774862402] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:03,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533596151] [2022-11-03 02:43:03,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:43:03,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:03,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:03,846 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:03,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:43:03,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-03 02:43:03,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:43:03,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:43:03,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:04,884 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:04,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:06,511 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:06,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533596151] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:06,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1540345411] [2022-11-03 02:43:06,512 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:06,512 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:06,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:06,513 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:06,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:06,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:07,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4780#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:07,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:07,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:07,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 68 [2022-11-03 02:43:07,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989759205] [2022-11-03 02:43:07,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:07,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-03 02:43:07,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:07,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-03 02:43:07,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=4802, Unknown=0, NotChecked=0, Total=5402 [2022-11-03 02:43:07,285 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:10,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:10,062 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2022-11-03 02:43:10,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-03 02:43:10,063 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-11-03 02:43:10,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:10,063 INFO L225 Difference]: With dead ends: 91 [2022-11-03 02:43:10,063 INFO L226 Difference]: Without dead ends: 56 [2022-11-03 02:43:10,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1048, Invalid=8264, Unknown=0, NotChecked=0, Total=9312 [2022-11-03 02:43:10,065 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:10,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 62 Invalid, 1070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 958 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:43:10,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-03 02:43:10,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-11-03 02:43:10,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:10,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-11-03 02:43:10,104 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 43 [2022-11-03 02:43:10,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:10,104 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-11-03 02:43:10,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.8235294117647058) internal successors, (124), 68 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:10,104 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-11-03 02:43:10,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-03 02:43:10,105 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:10,105 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-03 02:43:10,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:10,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:10,315 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:10,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:10,315 INFO L85 PathProgramCache]: Analyzing trace with hash -1857533990, now seen corresponding path program 12 times [2022-11-03 02:43:10,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:10,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704926726] [2022-11-03 02:43:10,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:10,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:10,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:10,833 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 45 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:10,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:10,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704926726] [2022-11-03 02:43:10,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704926726] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:10,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412596318] [2022-11-03 02:43:10,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:43:10,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:10,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:10,835 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:10,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:43:10,900 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:43:10,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:43:10,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:43:10,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:11,302 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:11,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:11,803 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:11,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412596318] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:11,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714102686] [2022-11-03 02:43:11,805 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:11,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:11,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:11,805 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:11,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:11,922 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:12,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5383#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:12,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:12,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:12,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-11-03 02:43:12,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309334762] [2022-11-03 02:43:12,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:12,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-03 02:43:12,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:12,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-03 02:43:12,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=2362, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:43:12,430 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:13,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:13,206 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2022-11-03 02:43:13,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 02:43:13,207 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-03 02:43:13,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:13,208 INFO L225 Difference]: With dead ends: 90 [2022-11-03 02:43:13,208 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 02:43:13,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 92 SyntacticMatches, 11 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1750 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=907, Invalid=4643, Unknown=0, NotChecked=0, Total=5550 [2022-11-03 02:43:13,209 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 84 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:13,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 46 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:43:13,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 02:43:13,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 48. [2022-11-03 02:43:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:13,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-03 02:43:13,249 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2022-11-03 02:43:13,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:13,250 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-03 02:43:13,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:13,250 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-03 02:43:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 02:43:13,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:13,251 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-03 02:43:13,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:13,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:43:13,454 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:13,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:13,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1431629180, now seen corresponding path program 13 times [2022-11-03 02:43:13,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:13,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918934368] [2022-11-03 02:43:13,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:13,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:13,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:14,651 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:14,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:14,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918934368] [2022-11-03 02:43:14,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918934368] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:14,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863605164] [2022-11-03 02:43:14,652 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:43:14,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:14,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:14,655 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:14,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:43:14,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:14,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 02:43:14,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:15,439 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:15,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:17,143 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:17,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863605164] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:17,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2054311802] [2022-11-03 02:43:17,145 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:17,145 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:17,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:17,146 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:17,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:17,252 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:17,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6004#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:17,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:17,853 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:17,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2022-11-03 02:43:17,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131379398] [2022-11-03 02:43:17,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:17,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-03 02:43:17,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:17,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-03 02:43:17,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=4083, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:43:17,856 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:22,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:22,603 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-11-03 02:43:22,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-03 02:43:22,603 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-11-03 02:43:22,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:22,604 INFO L225 Difference]: With dead ends: 132 [2022-11-03 02:43:22,604 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 02:43:22,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3539 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1766, Invalid=11806, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 02:43:22,607 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 177 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 1377 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 1626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 1377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:22,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 165 Invalid, 1626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 1377 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 02:43:22,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 02:43:22,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2022-11-03 02:43:22,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 62 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:22,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-11-03 02:43:22,663 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 47 [2022-11-03 02:43:22,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:22,664 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-11-03 02:43:22,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:22,664 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-11-03 02:43:22,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:43:22,665 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:22,665 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-03 02:43:22,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:22,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 02:43:22,866 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:22,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:22,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1237897350, now seen corresponding path program 14 times [2022-11-03 02:43:22,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:22,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795905536] [2022-11-03 02:43:22,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:22,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:22,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:24,178 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:24,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:24,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795905536] [2022-11-03 02:43:24,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795905536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:24,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904440301] [2022-11-03 02:43:24,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:43:24,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:24,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:24,180 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:24,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:43:24,250 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:43:24,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:43:24,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 02:43:24,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:25,471 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:25,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:27,456 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:27,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904440301] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:27,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92981942] [2022-11-03 02:43:27,458 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:27,458 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:27,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:27,458 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:27,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:27,547 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:28,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6820#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:28,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:28,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:28,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 80 [2022-11-03 02:43:28,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732708036] [2022-11-03 02:43:28,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:28,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-03 02:43:28,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:28,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-03 02:43:28,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=806, Invalid=6504, Unknown=0, NotChecked=0, Total=7310 [2022-11-03 02:43:28,164 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:31,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:31,979 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2022-11-03 02:43:31,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-03 02:43:31,980 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-03 02:43:31,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:31,980 INFO L225 Difference]: With dead ends: 107 [2022-11-03 02:43:31,981 INFO L226 Difference]: Without dead ends: 66 [2022-11-03 02:43:31,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3318 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1410, Invalid=11246, Unknown=0, NotChecked=0, Total=12656 [2022-11-03 02:43:31,982 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 1199 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 1351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:31,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 66 Invalid, 1351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1199 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:43:31,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-03 02:43:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2022-11-03 02:43:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:32,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2022-11-03 02:43:32,054 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 51 [2022-11-03 02:43:32,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:32,054 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2022-11-03 02:43:32,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.85) internal successors, (148), 80 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:32,054 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2022-11-03 02:43:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 02:43:32,055 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:32,055 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-03 02:43:32,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:32,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:43:32,255 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:32,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:32,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1541753754, now seen corresponding path program 15 times [2022-11-03 02:43:32,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:32,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651549176] [2022-11-03 02:43:32,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:32,256 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:32,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:32,917 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 66 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:32,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:32,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651549176] [2022-11-03 02:43:32,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651549176] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:32,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643111822] [2022-11-03 02:43:32,918 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:43:32,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:32,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:32,923 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:32,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:43:32,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:43:32,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:43:32,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 02:43:32,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:33,505 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:33,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:34,120 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:34,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643111822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:34,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604515759] [2022-11-03 02:43:34,122 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:34,122 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:34,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:34,123 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:34,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:34,203 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:34,747 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7533#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:34,747 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:34,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:34,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-11-03 02:43:34,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449386130] [2022-11-03 02:43:34,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:34,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-03 02:43:34,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:34,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-03 02:43:34,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=3135, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 02:43:34,751 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:35,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:35,710 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2022-11-03 02:43:35,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-03 02:43:35,710 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-03 02:43:35,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:35,711 INFO L225 Difference]: With dead ends: 106 [2022-11-03 02:43:35,712 INFO L226 Difference]: Without dead ends: 104 [2022-11-03 02:43:35,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 110 SyntacticMatches, 13 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2410 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1223, Invalid=6259, Unknown=0, NotChecked=0, Total=7482 [2022-11-03 02:43:35,713 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 87 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:35,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 53 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:43:35,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-03 02:43:35,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 56. [2022-11-03 02:43:35,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:35,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-03 02:43:35,760 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2022-11-03 02:43:35,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:35,760 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-03 02:43:35,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:35,760 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-03 02:43:35,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 02:43:35,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:35,761 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-11-03 02:43:35,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:35,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:35,962 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:35,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:35,962 INFO L85 PathProgramCache]: Analyzing trace with hash 10647236, now seen corresponding path program 16 times [2022-11-03 02:43:35,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:35,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683900025] [2022-11-03 02:43:35,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:35,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:35,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:37,343 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:37,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:37,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683900025] [2022-11-03 02:43:37,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683900025] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:37,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597096286] [2022-11-03 02:43:37,344 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:43:37,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:37,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:37,348 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:37,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:43:37,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:37,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 02:43:37,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:38,252 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:38,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:40,380 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:40,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597096286] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:40,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051692257] [2022-11-03 02:43:40,381 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:40,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:40,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:40,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:40,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:40,470 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:41,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8262#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:41,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:41,115 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:41,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 73 [2022-11-03 02:43:41,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748554823] [2022-11-03 02:43:41,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:41,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-03 02:43:41,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:41,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-03 02:43:41,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=5360, Unknown=0, NotChecked=0, Total=6162 [2022-11-03 02:43:41,117 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:47,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:47,495 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2022-11-03 02:43:47,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-03 02:43:47,496 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-11-03 02:43:47,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:47,497 INFO L225 Difference]: With dead ends: 154 [2022-11-03 02:43:47,497 INFO L226 Difference]: Without dead ends: 110 [2022-11-03 02:43:47,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4751 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=2345, Invalid=15745, Unknown=0, NotChecked=0, Total=18090 [2022-11-03 02:43:47,499 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 208 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 1881 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 2197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 1881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:47,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 212 Invalid, 2197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 1881 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 02:43:47,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-03 02:43:47,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2022-11-03 02:43:47,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:47,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2022-11-03 02:43:47,572 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 55 [2022-11-03 02:43:47,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:47,573 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2022-11-03 02:43:47,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:47,573 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2022-11-03 02:43:47,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:43:47,574 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:47,574 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-03 02:43:47,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:47,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:47,790 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:47,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:47,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1308327110, now seen corresponding path program 17 times [2022-11-03 02:43:47,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:47,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408336918] [2022-11-03 02:43:47,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:47,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:47,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:43:49,375 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:49,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:43:49,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408336918] [2022-11-03 02:43:49,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408336918] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:43:49,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338603547] [2022-11-03 02:43:49,379 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:43:49,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:43:49,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:43:49,380 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:43:49,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:43:49,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-03 02:43:49,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:43:49,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:43:49,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:43:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:51,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:43:53,597 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:43:53,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338603547] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:43:53,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278793611] [2022-11-03 02:43:53,599 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:43:53,599 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:43:53,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:43:53,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:43:53,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:43:53,687 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:43:54,484 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9210#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:43:54,484 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:43:54,484 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:43:54,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 92 [2022-11-03 02:43:54,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066122793] [2022-11-03 02:43:54,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:43:54,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-11-03 02:43:54,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:43:54,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-11-03 02:43:54,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1044, Invalid=8462, Unknown=0, NotChecked=0, Total=9506 [2022-11-03 02:43:54,486 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:59,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:43:59,653 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2022-11-03 02:43:59,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-03 02:43:59,654 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-03 02:43:59,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:43:59,655 INFO L225 Difference]: With dead ends: 123 [2022-11-03 02:43:59,655 INFO L226 Difference]: Without dead ends: 76 [2022-11-03 02:43:59,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4344 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1828, Invalid=14684, Unknown=0, NotChecked=0, Total=16512 [2022-11-03 02:43:59,657 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 52 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1567 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 1567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:43:59,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 79 Invalid, 1757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 1567 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:43:59,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-03 02:43:59,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-11-03 02:43:59,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:59,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2022-11-03 02:43:59,722 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 59 [2022-11-03 02:43:59,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:43:59,722 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2022-11-03 02:43:59,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.8695652173913044) internal successors, (172), 92 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:43:59,722 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2022-11-03 02:43:59,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 02:43:59,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:43:59,723 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-03 02:43:59,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 02:43:59,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 02:43:59,924 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:43:59,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:43:59,924 INFO L85 PathProgramCache]: Analyzing trace with hash -832274598, now seen corresponding path program 18 times [2022-11-03 02:43:59,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:43:59,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25224223] [2022-11-03 02:43:59,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:43:59,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:43:59,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:00,703 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 91 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:00,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:44:00,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25224223] [2022-11-03 02:44:00,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25224223] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:00,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842678892] [2022-11-03 02:44:00,703 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:44:00,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:00,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:00,705 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:00,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:44:00,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:44:00,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:00,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:44:00,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:01,340 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:01,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:02,083 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:02,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842678892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:02,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865222497] [2022-11-03 02:44:02,085 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:44:02,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:44:02,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:44:02,085 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:44:02,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:44:02,176 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:44:02,668 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10033#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:44:02,668 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:44:02,668 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:44:02,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-11-03 02:44:02,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820351739] [2022-11-03 02:44:02,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:02,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-03 02:44:02,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:44:02,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-03 02:44:02,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=4016, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:44:02,670 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:03,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:03,893 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2022-11-03 02:44:03,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:44:03,894 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-03 02:44:03,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:03,895 INFO L225 Difference]: With dead ends: 122 [2022-11-03 02:44:03,895 INFO L226 Difference]: Without dead ends: 120 [2022-11-03 02:44:03,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 128 SyntacticMatches, 15 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3174 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1587, Invalid=8115, Unknown=0, NotChecked=0, Total=9702 [2022-11-03 02:44:03,896 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 115 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:03,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 49 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:44:03,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-03 02:44:03,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 64. [2022-11-03 02:44:03,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:03,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-11-03 02:44:03,959 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2022-11-03 02:44:03,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:03,960 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-11-03 02:44:03,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:03,960 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-11-03 02:44:03,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-03 02:44:03,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:03,961 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-11-03 02:44:03,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:04,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:04,163 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:04,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:04,163 INFO L85 PathProgramCache]: Analyzing trace with hash 558476036, now seen corresponding path program 19 times [2022-11-03 02:44:04,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:44:04,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629443898] [2022-11-03 02:44:04,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:04,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:44:04,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:05,903 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 247 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:05,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:44:05,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629443898] [2022-11-03 02:44:05,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629443898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:05,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929696366] [2022-11-03 02:44:05,903 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:44:05,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:05,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:05,907 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:05,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:44:05,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:05,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-03 02:44:05,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:07,083 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:07,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:09,865 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:09,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929696366] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:09,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1810279799] [2022-11-03 02:44:09,867 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:44:09,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:44:09,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:44:09,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:44:09,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:44:09,963 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:44:10,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10870#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:44:10,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:44:10,674 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:44:10,674 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 83 [2022-11-03 02:44:10,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819930595] [2022-11-03 02:44:10,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:10,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-03 02:44:10,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:44:10,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-03 02:44:10,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1023, Invalid=6809, Unknown=0, NotChecked=0, Total=7832 [2022-11-03 02:44:10,676 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:19,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:19,070 INFO L93 Difference]: Finished difference Result 176 states and 195 transitions. [2022-11-03 02:44:19,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-03 02:44:19,071 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-11-03 02:44:19,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:19,072 INFO L225 Difference]: With dead ends: 176 [2022-11-03 02:44:19,072 INFO L226 Difference]: Without dead ends: 126 [2022-11-03 02:44:19,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6139 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=3008, Invalid=20248, Unknown=0, NotChecked=0, Total=23256 [2022-11-03 02:44:19,074 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 253 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 2614 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 2993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 2614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:19,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 278 Invalid, 2993 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 2614 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-03 02:44:19,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-03 02:44:19,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 83. [2022-11-03 02:44:19,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 82 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:19,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2022-11-03 02:44:19,174 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 63 [2022-11-03 02:44:19,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:19,174 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2022-11-03 02:44:19,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:19,174 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2022-11-03 02:44:19,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-03 02:44:19,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:19,175 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-03 02:44:19,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:19,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:19,383 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:19,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:19,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1798309626, now seen corresponding path program 20 times [2022-11-03 02:44:19,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:44:19,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825191558] [2022-11-03 02:44:19,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:19,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:44:19,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:21,255 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 287 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:21,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:44:21,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825191558] [2022-11-03 02:44:21,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825191558] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:21,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915403866] [2022-11-03 02:44:21,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:44:21,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:21,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:21,257 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:21,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 02:44:21,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-03 02:44:21,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:21,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-03 02:44:21,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:23,301 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:23,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:26,444 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:26,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915403866] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:26,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556505263] [2022-11-03 02:44:26,445 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:44:26,446 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:44:26,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:44:26,446 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:44:26,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:44:26,515 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:44:27,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11950#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:44:27,265 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:44:27,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:44:27,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 104 [2022-11-03 02:44:27,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156252234] [2022-11-03 02:44:27,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:27,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-03 02:44:27,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:44:27,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-03 02:44:27,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1314, Invalid=10676, Unknown=0, NotChecked=0, Total=11990 [2022-11-03 02:44:27,267 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:33,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:33,953 INFO L93 Difference]: Finished difference Result 139 states and 156 transitions. [2022-11-03 02:44:33,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-03 02:44:33,954 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-11-03 02:44:33,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:33,954 INFO L225 Difference]: With dead ends: 139 [2022-11-03 02:44:33,954 INFO L226 Difference]: Without dead ends: 86 [2022-11-03 02:44:33,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 127 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5506 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=2302, Invalid=18578, Unknown=0, NotChecked=0, Total=20880 [2022-11-03 02:44:33,956 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 64 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 1792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:33,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 75 Invalid, 1792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 02:44:33,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-03 02:44:34,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2022-11-03 02:44:34,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:34,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2022-11-03 02:44:34,055 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 67 [2022-11-03 02:44:34,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:34,056 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2022-11-03 02:44:34,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.8846153846153846) internal successors, (196), 104 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:34,056 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2022-11-03 02:44:34,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-03 02:44:34,057 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:34,057 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-03 02:44:34,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:34,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 02:44:34,283 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:34,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:34,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1637752038, now seen corresponding path program 21 times [2022-11-03 02:44:34,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:44:34,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716525403] [2022-11-03 02:44:34,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:34,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:44:34,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:35,256 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 120 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:35,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:44:35,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716525403] [2022-11-03 02:44:35,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716525403] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:35,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993271585] [2022-11-03 02:44:35,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:44:35,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:35,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:35,258 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:35,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 02:44:35,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:44:35,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:44:35,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-03 02:44:35,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:36,154 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:36,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:37,102 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:37,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993271585] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:37,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941515049] [2022-11-03 02:44:37,104 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:44:37,104 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:44:37,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:44:37,104 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:44:37,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:44:37,196 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:44:37,723 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12883#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:44:37,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:44:37,724 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:44:37,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2022-11-03 02:44:37,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075911048] [2022-11-03 02:44:37,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:37,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-03 02:44:37,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:44:37,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-03 02:44:37,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=5005, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 02:44:37,726 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:39,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:39,222 INFO L93 Difference]: Finished difference Result 138 states and 154 transitions. [2022-11-03 02:44:39,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:44:39,222 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-03 02:44:39,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:39,223 INFO L225 Difference]: With dead ends: 138 [2022-11-03 02:44:39,223 INFO L226 Difference]: Without dead ends: 136 [2022-11-03 02:44:39,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 146 SyntacticMatches, 17 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4042 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1999, Invalid=10211, Unknown=0, NotChecked=0, Total=12210 [2022-11-03 02:44:39,225 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 85 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 715 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 715 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:39,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 67 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 715 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:44:39,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-03 02:44:39,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 72. [2022-11-03 02:44:39,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:39,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-03 02:44:39,319 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2022-11-03 02:44:39,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:39,319 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-03 02:44:39,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:39,320 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-03 02:44:39,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-03 02:44:39,320 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:39,320 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-03 02:44:39,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:39,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-03 02:44:39,521 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:39,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:39,521 INFO L85 PathProgramCache]: Analyzing trace with hash 562343748, now seen corresponding path program 22 times [2022-11-03 02:44:39,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:44:39,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803691276] [2022-11-03 02:44:39,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:39,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:44:39,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:41,649 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 330 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:41,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:44:41,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803691276] [2022-11-03 02:44:41,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803691276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:44:41,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083651882] [2022-11-03 02:44:41,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:44:41,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:41,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:44:41,651 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:44:41,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 02:44:41,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:44:41,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-03 02:44:41,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:44:42,989 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:42,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:44:46,226 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:44:46,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083651882] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:44:46,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1071749498] [2022-11-03 02:44:46,227 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:44:46,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:44:46,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:44:46,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:44:46,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:44:46,307 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:44:47,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13828#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:44:47,216 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:44:47,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:44:47,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 93 [2022-11-03 02:44:47,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234733288] [2022-11-03 02:44:47,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:44:47,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-03 02:44:47,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:44:47,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-03 02:44:47,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1272, Invalid=8430, Unknown=0, NotChecked=0, Total=9702 [2022-11-03 02:44:47,219 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:57,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:44:57,858 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2022-11-03 02:44:57,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-03 02:44:57,859 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-11-03 02:44:57,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:44:57,860 INFO L225 Difference]: With dead ends: 198 [2022-11-03 02:44:57,860 INFO L226 Difference]: Without dead ends: 142 [2022-11-03 02:44:57,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7703 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=3755, Invalid=25315, Unknown=0, NotChecked=0, Total=29070 [2022-11-03 02:44:57,863 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 313 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 3131 mSolverCounterSat, 479 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 3610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 479 IncrementalHoareTripleChecker+Valid, 3131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:44:57,863 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [313 Valid, 348 Invalid, 3610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [479 Valid, 3131 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-03 02:44:57,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-03 02:44:57,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 93. [2022-11-03 02:44:57,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2065217391304348) internal successors, (111), 92 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:57,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2022-11-03 02:44:57,990 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 71 [2022-11-03 02:44:57,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:44:57,990 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2022-11-03 02:44:57,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:44:57,990 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2022-11-03 02:44:57,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-03 02:44:57,991 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:44:57,991 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-03 02:44:58,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 02:44:58,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:44:58,192 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:44:58,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:44:58,192 INFO L85 PathProgramCache]: Analyzing trace with hash 307608250, now seen corresponding path program 23 times [2022-11-03 02:44:58,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:44:58,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367651993] [2022-11-03 02:44:58,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:44:58,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:44:58,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:00,476 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 376 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:00,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:00,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367651993] [2022-11-03 02:45:00,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367651993] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:00,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656936067] [2022-11-03 02:45:00,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:45:00,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:00,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:00,478 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:00,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 02:45:00,574 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-03 02:45:00,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:00,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:45:00,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:02,939 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:02,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:06,714 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:06,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656936067] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:06,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085420767] [2022-11-03 02:45:06,715 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:45:06,715 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:06,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:06,716 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:06,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:06,803 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:07,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15040#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:45:07,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:07,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:45:07,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 116 [2022-11-03 02:45:07,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41885070] [2022-11-03 02:45:07,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:07,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-11-03 02:45:07,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:07,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-11-03 02:45:07,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1616, Invalid=13146, Unknown=0, NotChecked=0, Total=14762 [2022-11-03 02:45:07,631 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:16,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:16,172 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2022-11-03 02:45:16,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-03 02:45:16,172 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-11-03 02:45:16,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:16,173 INFO L225 Difference]: With dead ends: 155 [2022-11-03 02:45:16,173 INFO L226 Difference]: Without dead ends: 96 [2022-11-03 02:45:16,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6804 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=2832, Invalid=22928, Unknown=0, NotChecked=0, Total=25760 [2022-11-03 02:45:16,175 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 54 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 1908 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 1908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:16,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 84 Invalid, 2186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 1908 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 02:45:16,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-03 02:45:16,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2022-11-03 02:45:16,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1956521739130435) internal successors, (110), 92 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:16,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2022-11-03 02:45:16,308 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 75 [2022-11-03 02:45:16,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:16,309 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2022-11-03 02:45:16,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.896551724137931) internal successors, (220), 116 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:16,309 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2022-11-03 02:45:16,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-03 02:45:16,310 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:16,310 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-03 02:45:16,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:16,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 02:45:16,527 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:16,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:16,527 INFO L85 PathProgramCache]: Analyzing trace with hash -596019494, now seen corresponding path program 24 times [2022-11-03 02:45:16,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:16,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794117534] [2022-11-03 02:45:16,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:16,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:16,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:17,548 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 153 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:17,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:17,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794117534] [2022-11-03 02:45:17,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794117534] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:17,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834773652] [2022-11-03 02:45:17,549 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:45:17,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:17,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:17,550 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:17,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 02:45:17,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:45:17,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:17,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:45:17,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:18,467 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:18,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:19,541 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:19,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834773652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:19,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1189309385] [2022-11-03 02:45:19,542 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:45:19,543 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:19,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:19,543 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:19,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:19,637 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:20,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16083#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:45:20,332 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:20,332 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:45:20,332 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2022-11-03 02:45:20,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436882365] [2022-11-03 02:45:20,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:20,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-03 02:45:20,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:20,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-03 02:45:20,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1038, Invalid=6102, Unknown=0, NotChecked=0, Total=7140 [2022-11-03 02:45:20,334 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:22,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:22,171 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2022-11-03 02:45:22,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-03 02:45:22,179 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-11-03 02:45:22,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:22,179 INFO L225 Difference]: With dead ends: 154 [2022-11-03 02:45:22,180 INFO L226 Difference]: Without dead ends: 152 [2022-11-03 02:45:22,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 164 SyntacticMatches, 19 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5014 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2459, Invalid=12547, Unknown=0, NotChecked=0, Total=15006 [2022-11-03 02:45:22,181 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 135 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1099 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 272 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:22,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 70 Invalid, 1099 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [272 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:45:22,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-03 02:45:22,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 80. [2022-11-03 02:45:22,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:22,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-03 02:45:22,275 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2022-11-03 02:45:22,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:22,276 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-03 02:45:22,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:22,276 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-03 02:45:22,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-03 02:45:22,276 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:22,276 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-11-03 02:45:22,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:22,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 02:45:22,491 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:22,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:22,491 INFO L85 PathProgramCache]: Analyzing trace with hash -617118844, now seen corresponding path program 25 times [2022-11-03 02:45:22,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:22,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851702292] [2022-11-03 02:45:22,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:22,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:22,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:24,741 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 425 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:24,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:24,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851702292] [2022-11-03 02:45:24,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851702292] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:24,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294298658] [2022-11-03 02:45:24,742 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:45:24,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:24,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:24,743 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:24,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 02:45:24,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:24,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-03 02:45:24,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:26,352 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:26,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:30,249 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:30,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294298658] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:30,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719579304] [2022-11-03 02:45:30,251 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:45:30,251 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:30,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:30,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:30,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:30,325 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:31,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17136#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:45:31,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:31,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:45:31,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2022-11-03 02:45:31,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708801908] [2022-11-03 02:45:31,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:31,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-03 02:45:31,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:31,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-03 02:45:31,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1549, Invalid=10223, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:45:31,181 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:44,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:44,319 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2022-11-03 02:45:44,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-03 02:45:44,320 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2022-11-03 02:45:44,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:44,320 INFO L225 Difference]: With dead ends: 220 [2022-11-03 02:45:44,321 INFO L226 Difference]: Without dead ends: 158 [2022-11-03 02:45:44,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 170 SyntacticMatches, 1 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9443 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=4586, Invalid=30946, Unknown=0, NotChecked=0, Total=35532 [2022-11-03 02:45:44,323 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 367 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 3763 mSolverCounterSat, 573 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 4336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 573 IncrementalHoareTripleChecker+Valid, 3763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:44,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [367 Valid, 421 Invalid, 4336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [573 Valid, 3763 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-03 02:45:44,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-03 02:45:44,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 103. [2022-11-03 02:45:44,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 102 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:44,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2022-11-03 02:45:44,493 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 79 [2022-11-03 02:45:44,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:44,493 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2022-11-03 02:45:44,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:45:44,493 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2022-11-03 02:45:44,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-03 02:45:44,494 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:44,494 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-03 02:45:44,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-11-03 02:45:44,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 02:45:44,695 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:44,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:44,695 INFO L85 PathProgramCache]: Analyzing trace with hash -216949126, now seen corresponding path program 26 times [2022-11-03 02:45:44,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:44,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672548296] [2022-11-03 02:45:44,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:44,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:44,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:47,126 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 477 proven. 284 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:47,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:47,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672548296] [2022-11-03 02:45:47,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672548296] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:47,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769961043] [2022-11-03 02:45:47,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:45:47,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:47,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:47,128 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:47,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 02:45:47,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-03 02:45:47,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:47,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-03 02:45:47,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:50,138 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:50,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:54,642 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:45:54,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769961043] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:54,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974170961] [2022-11-03 02:45:54,644 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:45:54,644 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:54,644 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:54,644 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:54,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:54,732 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:55,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18480#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:45:55,611 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:55,612 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:45:55,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 128 [2022-11-03 02:45:55,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187701886] [2022-11-03 02:45:55,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:55,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-03 02:45:55,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:55,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-03 02:45:55,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1950, Invalid=15872, Unknown=0, NotChecked=0, Total=17822 [2022-11-03 02:45:55,614 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:06,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:06,279 INFO L93 Difference]: Finished difference Result 171 states and 192 transitions. [2022-11-03 02:46:06,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-03 02:46:06,279 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2022-11-03 02:46:06,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:06,280 INFO L225 Difference]: With dead ends: 171 [2022-11-03 02:46:06,280 INFO L226 Difference]: Without dead ends: 106 [2022-11-03 02:46:06,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8238 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=3418, Invalid=27734, Unknown=0, NotChecked=0, Total=31152 [2022-11-03 02:46:06,283 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 2101 mSolverCounterSat, 302 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 302 IncrementalHoareTripleChecker+Valid, 2101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:06,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 86 Invalid, 2403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [302 Valid, 2101 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-03 02:46:06,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-03 02:46:06,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-11-03 02:46:06,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.196078431372549) internal successors, (122), 102 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:06,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-11-03 02:46:06,446 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 83 [2022-11-03 02:46:06,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:06,446 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-11-03 02:46:06,446 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.90625) internal successors, (244), 128 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:06,446 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-11-03 02:46:06,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-03 02:46:06,447 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:06,447 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-03 02:46:06,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:06,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:06,647 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:06,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:06,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1270400358, now seen corresponding path program 27 times [2022-11-03 02:46:06,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:06,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856595915] [2022-11-03 02:46:06,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:06,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:06,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:07,711 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 190 proven. 592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:07,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:07,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856595915] [2022-11-03 02:46:07,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856595915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:46:07,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137422847] [2022-11-03 02:46:07,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:46:07,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:07,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:07,713 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:07,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-03 02:46:07,797 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:46:07,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:46:07,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-03 02:46:07,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:08,786 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:08,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:10,079 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:10,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137422847] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:10,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [632423272] [2022-11-03 02:46:10,081 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:46:10,081 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:10,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:10,081 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:10,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:10,169 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:10,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19633#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:46:10,892 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:10,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:46:10,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-11-03 02:46:10,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598307854] [2022-11-03 02:46:10,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:10,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-03 02:46:10,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:10,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-03 02:46:10,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1249, Invalid=7307, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 02:46:10,895 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:13,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:13,059 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2022-11-03 02:46:13,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-03 02:46:13,060 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-11-03 02:46:13,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:13,061 INFO L225 Difference]: With dead ends: 170 [2022-11-03 02:46:13,061 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 02:46:13,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 182 SyntacticMatches, 21 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6090 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2967, Invalid=15123, Unknown=0, NotChecked=0, Total=18090 [2022-11-03 02:46:13,062 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 146 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 283 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 283 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:13,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 71 Invalid, 1249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [283 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:46:13,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 02:46:13,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2022-11-03 02:46:13,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:13,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-03 02:46:13,188 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2022-11-03 02:46:13,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:13,188 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-03 02:46:13,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:13,189 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-03 02:46:13,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 02:46:13,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:13,190 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-11-03 02:46:13,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:13,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-03 02:46:13,395 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:13,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:13,396 INFO L85 PathProgramCache]: Analyzing trace with hash 759572420, now seen corresponding path program 28 times [2022-11-03 02:46:13,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:13,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752237424] [2022-11-03 02:46:13,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:13,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:13,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:15,898 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 532 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:15,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:15,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752237424] [2022-11-03 02:46:15,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752237424] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:46:15,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613824341] [2022-11-03 02:46:15,899 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:46:15,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:15,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:15,900 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:15,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-03 02:46:15,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:15,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-03 02:46:15,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:17,827 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:17,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:22,385 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:22,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613824341] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:22,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530647151] [2022-11-03 02:46:22,387 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:46:22,387 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:22,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:22,388 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:22,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:22,481 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:23,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20794#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:46:23,383 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:23,383 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:46:23,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2022-11-03 02:46:23,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966630685] [2022-11-03 02:46:23,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:23,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-03 02:46:23,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:23,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-03 02:46:23,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=12188, Unknown=0, NotChecked=0, Total=14042 [2022-11-03 02:46:23,386 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:39,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:39,477 INFO L93 Difference]: Finished difference Result 242 states and 267 transitions. [2022-11-03 02:46:39,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-03 02:46:39,478 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2022-11-03 02:46:39,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:39,478 INFO L225 Difference]: With dead ends: 242 [2022-11-03 02:46:39,478 INFO L226 Difference]: Without dead ends: 174 [2022-11-03 02:46:39,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11359 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=5501, Invalid=37141, Unknown=0, NotChecked=0, Total=42642 [2022-11-03 02:46:39,481 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 425 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 4735 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 425 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 5390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 4735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:39,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [425 Valid, 511 Invalid, 5390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 4735 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-03 02:46:39,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-03 02:46:39,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 113. [2022-11-03 02:46:39,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.2053571428571428) internal successors, (135), 112 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:39,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 135 transitions. [2022-11-03 02:46:39,739 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 135 transitions. Word has length 87 [2022-11-03 02:46:39,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:39,739 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 135 transitions. [2022-11-03 02:46:39,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:46:39,740 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 135 transitions. [2022-11-03 02:46:39,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-03 02:46:39,740 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:39,740 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-03 02:46:39,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:39,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-03 02:46:39,941 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:39,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:39,941 INFO L85 PathProgramCache]: Analyzing trace with hash 872395322, now seen corresponding path program 29 times [2022-11-03 02:46:39,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:39,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455084829] [2022-11-03 02:46:39,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:39,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:39,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:42,673 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 590 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:42,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:42,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455084829] [2022-11-03 02:46:42,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455084829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:46:42,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287054371] [2022-11-03 02:46:42,674 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:46:42,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:42,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:42,675 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:42,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-03 02:46:42,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-03 02:46:42,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:46:42,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-03 02:46:42,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:46,142 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:46,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:51,428 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:46:51,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287054371] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:51,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [12405160] [2022-11-03 02:46:51,430 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:46:51,430 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:51,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:51,431 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:51,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:51,514 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:52,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22270#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:46:52,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:52,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:46:52,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 140 [2022-11-03 02:46:52,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649938296] [2022-11-03 02:46:52,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:52,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-11-03 02:46:52,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:52,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-11-03 02:46:52,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2316, Invalid=18854, Unknown=0, NotChecked=0, Total=21170 [2022-11-03 02:46:52,630 INFO L87 Difference]: Start difference. First operand 113 states and 135 transitions. Second operand has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:06,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:47:06,151 INFO L93 Difference]: Finished difference Result 187 states and 210 transitions. [2022-11-03 02:47:06,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-03 02:47:06,151 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2022-11-03 02:47:06,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:47:06,152 INFO L225 Difference]: With dead ends: 187 [2022-11-03 02:47:06,152 INFO L226 Difference]: Without dead ends: 116 [2022-11-03 02:47:06,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 175 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9808 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=4060, Invalid=32996, Unknown=0, NotChecked=0, Total=37056 [2022-11-03 02:47:06,155 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 56 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 2879 mSolverCounterSat, 355 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 3234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 355 IncrementalHoareTripleChecker+Valid, 2879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:47:06,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 105 Invalid, 3234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [355 Valid, 2879 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-03 02:47:06,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-03 02:47:06,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2022-11-03 02:47:06,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.1964285714285714) internal successors, (134), 112 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:06,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 134 transitions. [2022-11-03 02:47:06,355 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 134 transitions. Word has length 91 [2022-11-03 02:47:06,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:47:06,355 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 134 transitions. [2022-11-03 02:47:06,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 1.9142857142857144) internal successors, (268), 140 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:06,356 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2022-11-03 02:47:06,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-03 02:47:06,356 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:47:06,356 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-03 02:47:06,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-03 02:47:06,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:47:06,557 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:47:06,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:47:06,557 INFO L85 PathProgramCache]: Analyzing trace with hash 744959578, now seen corresponding path program 30 times [2022-11-03 02:47:06,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:47:06,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103678486] [2022-11-03 02:47:06,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:47:06,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:47:06,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:47:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 231 proven. 717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:07,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:47:07,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103678486] [2022-11-03 02:47:07,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103678486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:47:07,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52414762] [2022-11-03 02:47:07,874 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:47:07,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:47:07,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:47:07,875 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:47:07,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-03 02:47:07,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:47:07,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:47:07,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-03 02:47:07,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:47:09,120 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:09,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:47:10,655 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:10,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52414762] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:47:10,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1551656812] [2022-11-03 02:47:10,656 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:47:10,656 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:47:10,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:47:10,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:47:10,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:47:10,730 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:47:11,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23533#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:47:11,376 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:47:11,377 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:47:11,377 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2022-11-03 02:47:11,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864263917] [2022-11-03 02:47:11,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:47:11,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-03 02:47:11,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:47:11,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-03 02:47:11,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1480, Invalid=8620, Unknown=0, NotChecked=0, Total=10100 [2022-11-03 02:47:11,379 INFO L87 Difference]: Start difference. First operand 113 states and 134 transitions. Second operand has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:13,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:47:13,956 INFO L93 Difference]: Finished difference Result 186 states and 208 transitions. [2022-11-03 02:47:13,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-03 02:47:13,957 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-03 02:47:13,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:47:13,958 INFO L225 Difference]: With dead ends: 186 [2022-11-03 02:47:13,958 INFO L226 Difference]: Without dead ends: 184 [2022-11-03 02:47:13,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 200 SyntacticMatches, 23 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7270 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3523, Invalid=17939, Unknown=0, NotChecked=0, Total=21462 [2022-11-03 02:47:13,959 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 151 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 1126 mSolverCounterSat, 328 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 1454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 328 IncrementalHoareTripleChecker+Valid, 1126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:47:13,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 69 Invalid, 1454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [328 Valid, 1126 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:47:13,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-03 02:47:14,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 96. [2022-11-03 02:47:14,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:14,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-11-03 02:47:14,141 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2022-11-03 02:47:14,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:47:14,141 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-11-03 02:47:14,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:14,141 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-11-03 02:47:14,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-03 02:47:14,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:47:14,142 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-03 02:47:14,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-03 02:47:14,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:47:14,342 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:47:14,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:47:14,343 INFO L85 PathProgramCache]: Analyzing trace with hash 999595012, now seen corresponding path program 31 times [2022-11-03 02:47:14,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:47:14,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488481842] [2022-11-03 02:47:14,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:47:14,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:47:14,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:47:17,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 651 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:17,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:47:17,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488481842] [2022-11-03 02:47:17,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488481842] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:47:17,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523235387] [2022-11-03 02:47:17,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:47:17,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:47:17,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:47:17,255 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:47:17,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-03 02:47:17,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:47:17,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-03 02:47:17,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:47:19,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:19,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:47:24,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:24,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523235387] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:47:24,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577725986] [2022-11-03 02:47:24,875 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:47:24,875 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:47:24,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:47:24,875 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:47:24,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:47:24,950 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:47:25,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24802#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:47:25,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:47:25,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:47:25,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 123 [2022-11-03 02:47:25,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083906508] [2022-11-03 02:47:25,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:47:25,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-03 02:47:25,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:47:25,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-03 02:47:25,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2187, Invalid=14325, Unknown=0, NotChecked=0, Total=16512 [2022-11-03 02:47:25,952 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:45,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:47:45,424 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2022-11-03 02:47:45,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-03 02:47:45,424 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-11-03 02:47:45,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:47:45,425 INFO L225 Difference]: With dead ends: 264 [2022-11-03 02:47:45,425 INFO L226 Difference]: Without dead ends: 190 [2022-11-03 02:47:45,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 206 SyntacticMatches, 1 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13451 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=6500, Invalid=43900, Unknown=0, NotChecked=0, Total=50400 [2022-11-03 02:47:45,428 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 481 mSDsluCounter, 595 mSDsCounter, 0 mSdLazyCounter, 5294 mSolverCounterSat, 759 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 6053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 759 IncrementalHoareTripleChecker+Valid, 5294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:47:45,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 596 Invalid, 6053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [759 Valid, 5294 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-03 02:47:45,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-03 02:47:45,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 123. [2022-11-03 02:47:45,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.2049180327868851) internal successors, (147), 122 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:45,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2022-11-03 02:47:45,691 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 95 [2022-11-03 02:47:45,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:47:45,691 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2022-11-03 02:47:45,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:47:45,692 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2022-11-03 02:47:45,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-03 02:47:45,693 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:47:45,693 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-03 02:47:45,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-03 02:47:45,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-03 02:47:45,903 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:47:45,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:47:45,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1766066694, now seen corresponding path program 32 times [2022-11-03 02:47:45,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:47:45,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582808081] [2022-11-03 02:47:45,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:47:45,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:47:45,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:47:49,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 715 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:49,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:47:49,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582808081] [2022-11-03 02:47:49,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582808081] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:47:49,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355599337] [2022-11-03 02:47:49,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:47:49,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:47:49,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:47:49,034 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:47:49,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-03 02:47:49,178 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-03 02:47:49,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:47:49,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-03 02:47:49,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:47:53,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:53,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:47:59,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:47:59,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355599337] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:47:59,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024679003] [2022-11-03 02:47:59,241 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:47:59,242 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:47:59,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:47:59,242 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:47:59,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:47:59,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:48:00,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26410#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:48:00,341 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:48:00,341 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:48:00,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 152 [2022-11-03 02:48:00,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678475446] [2022-11-03 02:48:00,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:48:00,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2022-11-03 02:48:00,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:48:00,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2022-11-03 02:48:00,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2714, Invalid=22092, Unknown=0, NotChecked=0, Total=24806 [2022-11-03 02:48:00,344 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:16,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:48:16,489 INFO L93 Difference]: Finished difference Result 203 states and 228 transitions. [2022-11-03 02:48:16,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-03 02:48:16,490 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2022-11-03 02:48:16,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:48:16,491 INFO L225 Difference]: With dead ends: 203 [2022-11-03 02:48:16,491 INFO L226 Difference]: Without dead ends: 126 [2022-11-03 02:48:16,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11514 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=4758, Invalid=38714, Unknown=0, NotChecked=0, Total=43472 [2022-11-03 02:48:16,493 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 61 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 3225 mSolverCounterSat, 410 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 3635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 410 IncrementalHoareTripleChecker+Valid, 3225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:48:16,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 103 Invalid, 3635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [410 Valid, 3225 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-03 02:48:16,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-03 02:48:16,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2022-11-03 02:48:16,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 122 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:16,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 146 transitions. [2022-11-03 02:48:16,781 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 146 transitions. Word has length 99 [2022-11-03 02:48:16,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:48:16,782 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 146 transitions. [2022-11-03 02:48:16,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.9210526315789473) internal successors, (292), 152 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:16,782 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 146 transitions. [2022-11-03 02:48:16,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-03 02:48:16,783 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:48:16,783 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-03 02:48:16,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-03 02:48:16,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-03 02:48:16,999 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:48:16,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:48:16,999 INFO L85 PathProgramCache]: Analyzing trace with hash -428518886, now seen corresponding path program 33 times [2022-11-03 02:48:16,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:48:16,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52987141] [2022-11-03 02:48:16,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:48:16,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:48:17,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:48:18,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 276 proven. 854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:18,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:48:18,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52987141] [2022-11-03 02:48:18,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52987141] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:48:18,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776579171] [2022-11-03 02:48:18,476 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:48:18,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:48:18,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:48:18,479 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:48:18,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-03 02:48:18,586 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:48:18,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:48:18,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-03 02:48:18,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:48:19,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:19,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:48:21,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:21,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776579171] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:48:21,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314374007] [2022-11-03 02:48:21,699 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:48:21,699 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:48:21,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:48:21,700 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:48:21,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:48:21,800 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:48:22,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27783#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:48:22,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:48:22,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:48:22,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2022-11-03 02:48:22,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026257422] [2022-11-03 02:48:22,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:48:22,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-03 02:48:22,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:48:22,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-03 02:48:22,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=10041, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:48:22,617 INFO L87 Difference]: Start difference. First operand 123 states and 146 transitions. Second operand has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:25,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:48:25,590 INFO L93 Difference]: Finished difference Result 202 states and 226 transitions. [2022-11-03 02:48:25,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-03 02:48:25,590 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 100 [2022-11-03 02:48:25,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:48:25,591 INFO L225 Difference]: With dead ends: 202 [2022-11-03 02:48:25,591 INFO L226 Difference]: Without dead ends: 200 [2022-11-03 02:48:25,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 218 SyntacticMatches, 25 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8554 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4127, Invalid=20995, Unknown=0, NotChecked=0, Total=25122 [2022-11-03 02:48:25,592 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 181 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1231 mSolverCounterSat, 413 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 1644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 413 IncrementalHoareTripleChecker+Valid, 1231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:48:25,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 76 Invalid, 1644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [413 Valid, 1231 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:48:25,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-11-03 02:48:25,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 104. [2022-11-03 02:48:25,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:25,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-11-03 02:48:25,795 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2022-11-03 02:48:25,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:48:25,795 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-11-03 02:48:25,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:48:25,795 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-11-03 02:48:25,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-03 02:48:25,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:48:25,796 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-11-03 02:48:25,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-03 02:48:25,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:48:25,996 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:48:25,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:48:25,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1358503868, now seen corresponding path program 34 times [2022-11-03 02:48:25,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:48:25,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267070906] [2022-11-03 02:48:25,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:48:25,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:48:26,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:48:29,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 782 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:29,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:48:29,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267070906] [2022-11-03 02:48:29,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267070906] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:48:29,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914551571] [2022-11-03 02:48:29,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:48:29,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:48:29,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:48:29,358 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:48:29,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-03 02:48:29,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:48:29,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-03 02:48:29,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:48:31,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:31,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:48:37,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:48:37,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914551571] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:48:37,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857555124] [2022-11-03 02:48:37,983 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:48:37,983 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:48:37,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:48:37,984 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:48:37,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:48:38,054 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:48:39,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29160#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:48:39,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:48:39,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:48:39,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 133 [2022-11-03 02:48:39,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099092585] [2022-11-03 02:48:39,093 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:48:39,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-03 02:48:39,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:48:39,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-03 02:48:39,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2548, Invalid=16634, Unknown=0, NotChecked=0, Total=19182 [2022-11-03 02:48:39,095 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:02,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:49:02,046 INFO L93 Difference]: Finished difference Result 286 states and 315 transitions. [2022-11-03 02:49:02,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-11-03 02:49:02,047 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2022-11-03 02:49:02,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:49:02,048 INFO L225 Difference]: With dead ends: 286 [2022-11-03 02:49:02,048 INFO L226 Difference]: Without dead ends: 206 [2022-11-03 02:49:02,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15719 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=7583, Invalid=51223, Unknown=0, NotChecked=0, Total=58806 [2022-11-03 02:49:02,051 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 560 mSDsluCounter, 693 mSDsCounter, 0 mSdLazyCounter, 6023 mSolverCounterSat, 903 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 560 SdHoareTripleChecker+Valid, 695 SdHoareTripleChecker+Invalid, 6926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 903 IncrementalHoareTripleChecker+Valid, 6023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:49:02,051 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [560 Valid, 695 Invalid, 6926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [903 Valid, 6023 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-03 02:49:02,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-03 02:49:02,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 133. [2022-11-03 02:49:02,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2045454545454546) internal successors, (159), 132 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:02,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2022-11-03 02:49:02,380 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 103 [2022-11-03 02:49:02,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:49:02,380 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2022-11-03 02:49:02,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:02,381 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2022-11-03 02:49:02,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-03 02:49:02,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:49:02,382 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-03 02:49:02,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-03 02:49:02,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-03 02:49:02,591 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:49:02,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:49:02,591 INFO L85 PathProgramCache]: Analyzing trace with hash 937585082, now seen corresponding path program 35 times [2022-11-03 02:49:02,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:49:02,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479779063] [2022-11-03 02:49:02,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:49:02,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:49:02,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:49:06,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 852 proven. 449 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:06,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:49:06,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479779063] [2022-11-03 02:49:06,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479779063] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:49:06,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186669079] [2022-11-03 02:49:06,190 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:49:06,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:49:06,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:49:06,191 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:49:06,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-03 02:49:06,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-03 02:49:06,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:49:06,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-03 02:49:06,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:49:10,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:10,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:49:17,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:17,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186669079] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:49:17,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [116716839] [2022-11-03 02:49:17,962 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:49:17,962 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:49:17,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:49:17,962 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:49:17,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:49:18,057 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:49:19,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30900#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:49:19,302 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:49:19,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:49:19,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 164 [2022-11-03 02:49:19,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321688570] [2022-11-03 02:49:19,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:49:19,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2022-11-03 02:49:19,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:49:19,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2022-11-03 02:49:19,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3144, Invalid=25586, Unknown=0, NotChecked=0, Total=28730 [2022-11-03 02:49:19,306 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:38,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:49:38,792 INFO L93 Difference]: Finished difference Result 219 states and 246 transitions. [2022-11-03 02:49:38,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-11-03 02:49:38,793 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2022-11-03 02:49:38,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:49:38,793 INFO L225 Difference]: With dead ends: 219 [2022-11-03 02:49:38,794 INFO L226 Difference]: Without dead ends: 136 [2022-11-03 02:49:38,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 207 SyntacticMatches, 1 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13356 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=5512, Invalid=44888, Unknown=0, NotChecked=0, Total=50400 [2022-11-03 02:49:38,796 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 4033 mSolverCounterSat, 494 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 4527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 494 IncrementalHoareTripleChecker+Valid, 4033 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:49:38,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 129 Invalid, 4527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [494 Valid, 4033 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-03 02:49:38,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-03 02:49:39,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2022-11-03 02:49:39,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.196969696969697) internal successors, (158), 132 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:39,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 158 transitions. [2022-11-03 02:49:39,130 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 158 transitions. Word has length 107 [2022-11-03 02:49:39,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:49:39,130 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 158 transitions. [2022-11-03 02:49:39,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 1.9268292682926829) internal successors, (316), 164 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:39,131 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 158 transitions. [2022-11-03 02:49:39,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-03 02:49:39,131 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:49:39,131 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-03 02:49:39,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-03 02:49:39,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-03 02:49:39,332 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:49:39,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:49:39,332 INFO L85 PathProgramCache]: Analyzing trace with hash -552753702, now seen corresponding path program 36 times [2022-11-03 02:49:39,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:49:39,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243693893] [2022-11-03 02:49:39,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:49:39,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:49:39,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:49:41,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 325 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:41,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:49:41,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243693893] [2022-11-03 02:49:41,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243693893] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:49:41,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216817429] [2022-11-03 02:49:41,100 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:49:41,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:49:41,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:49:41,101 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:49:41,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-03 02:49:41,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:49:41,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:49:41,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-03 02:49:41,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:49:42,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:42,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:49:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:44,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216817429] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:49:44,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573946528] [2022-11-03 02:49:44,797 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:49:44,797 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:49:44,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:49:44,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:49:44,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:49:44,874 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:49:45,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32383#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:49:45,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:49:45,730 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:49:45,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2022-11-03 02:49:45,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720334715] [2022-11-03 02:49:45,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:49:45,731 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-03 02:49:45,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:49:45,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-03 02:49:45,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2002, Invalid=11570, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 02:49:45,733 INFO L87 Difference]: Start difference. First operand 133 states and 158 transitions. Second operand has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:49,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:49:49,108 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2022-11-03 02:49:49,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-03 02:49:49,109 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2022-11-03 02:49:49,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:49:49,110 INFO L225 Difference]: With dead ends: 218 [2022-11-03 02:49:49,110 INFO L226 Difference]: Without dead ends: 216 [2022-11-03 02:49:49,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 236 SyntacticMatches, 27 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9942 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4779, Invalid=24291, Unknown=0, NotChecked=0, Total=29070 [2022-11-03 02:49:49,112 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 195 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 1404 mSolverCounterSat, 374 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 1778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 374 IncrementalHoareTripleChecker+Valid, 1404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:49:49,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 91 Invalid, 1778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [374 Valid, 1404 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:49:49,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-11-03 02:49:49,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2022-11-03 02:49:49,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:49,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-11-03 02:49:49,344 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2022-11-03 02:49:49,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:49:49,344 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-11-03 02:49:49,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:49:49,345 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-11-03 02:49:49,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-03 02:49:49,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:49:49,345 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-11-03 02:49:49,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-03 02:49:49,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-03 02:49:49,546 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:49:49,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:49:49,546 INFO L85 PathProgramCache]: Analyzing trace with hash -176098172, now seen corresponding path program 37 times [2022-11-03 02:49:49,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:49:49,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218330915] [2022-11-03 02:49:49,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:49:49,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:49:49,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:49:53,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 925 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:53,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:49:53,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218330915] [2022-11-03 02:49:53,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218330915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:49:53,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356228406] [2022-11-03 02:49:53,390 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:49:53,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:49:53,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:49:53,391 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:49:53,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-03 02:49:53,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:49:53,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-03 02:49:53,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:49:56,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:49:56,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:50:03,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:50:03,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356228406] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:50:03,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403481184] [2022-11-03 02:50:03,211 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:50:03,211 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:50:03,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:50:03,211 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:50:03,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:50:03,276 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:50:04,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33868#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:50:04,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:50:04,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:50:04,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 143 [2022-11-03 02:50:04,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284290289] [2022-11-03 02:50:04,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:50:04,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-03 02:50:04,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:50:04,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-03 02:50:04,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2937, Invalid=19115, Unknown=0, NotChecked=0, Total=22052 [2022-11-03 02:50:04,388 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:50:31,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:50:31,424 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2022-11-03 02:50:31,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-11-03 02:50:31,425 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2022-11-03 02:50:31,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:50:31,426 INFO L225 Difference]: With dead ends: 308 [2022-11-03 02:50:31,426 INFO L226 Difference]: Without dead ends: 222 [2022-11-03 02:50:31,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 242 SyntacticMatches, 1 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18163 ImplicationChecksByTransitivity, 32.6s TimeCoverageRelationStatistics Valid=8750, Invalid=59110, Unknown=0, NotChecked=0, Total=67860 [2022-11-03 02:50:31,430 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 629 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 6991 mSolverCounterSat, 1025 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 629 SdHoareTripleChecker+Valid, 798 SdHoareTripleChecker+Invalid, 8016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1025 IncrementalHoareTripleChecker+Valid, 6991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:50:31,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [629 Valid, 798 Invalid, 8016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1025 Valid, 6991 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-11-03 02:50:31,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-03 02:50:32,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 143. [2022-11-03 02:50:32,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.204225352112676) internal successors, (171), 142 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:50:32,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2022-11-03 02:50:32,013 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 111 [2022-11-03 02:50:32,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:50:32,013 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2022-11-03 02:50:32,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:50:32,013 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2022-11-03 02:50:32,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-03 02:50:32,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:50:32,014 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-03 02:50:32,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-03 02:50:32,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:50:32,214 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:50:32,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:50:32,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1326386554, now seen corresponding path program 38 times [2022-11-03 02:50:32,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:50:32,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779994752] [2022-11-03 02:50:32,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:50:32,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:50:32,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:50:36,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 1001 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:50:36,393 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:50:36,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779994752] [2022-11-03 02:50:36,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779994752] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:50:36,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599106766] [2022-11-03 02:50:36,393 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:50:36,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:50:36,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:50:36,394 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:50:36,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-03 02:50:36,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-11-03 02:50:36,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:50:36,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-03 02:50:36,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:50:41,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:50:41,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:50:49,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:50:49,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599106766] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:50:49,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330656084] [2022-11-03 02:50:49,780 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:50:49,780 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:50:49,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:50:49,781 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:50:49,781 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:50:49,861 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:50:51,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35740#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:50:51,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:50:51,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:50:51,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 176 [2022-11-03 02:50:51,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13526255] [2022-11-03 02:50:51,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:50:51,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-11-03 02:50:51,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:50:51,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-11-03 02:50:51,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3606, Invalid=29336, Unknown=0, NotChecked=0, Total=32942 [2022-11-03 02:50:51,036 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:13,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:51:13,894 INFO L93 Difference]: Finished difference Result 235 states and 264 transitions. [2022-11-03 02:51:13,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-03 02:51:13,895 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2022-11-03 02:51:13,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:51:13,896 INFO L225 Difference]: With dead ends: 235 [2022-11-03 02:51:13,896 INFO L226 Difference]: Without dead ends: 146 [2022-11-03 02:51:13,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 223 SyntacticMatches, 1 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15334 ImplicationChecksByTransitivity, 34.5s TimeCoverageRelationStatistics Valid=6322, Invalid=51518, Unknown=0, NotChecked=0, Total=57840 [2022-11-03 02:51:13,901 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 68 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 4252 mSolverCounterSat, 564 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 4816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 564 IncrementalHoareTripleChecker+Valid, 4252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:51:13,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 126 Invalid, 4816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [564 Valid, 4252 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-03 02:51:13,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-03 02:51:14,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2022-11-03 02:51:14,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1971830985915493) internal successors, (170), 142 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:14,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2022-11-03 02:51:14,311 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 115 [2022-11-03 02:51:14,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:51:14,311 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2022-11-03 02:51:14,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.9318181818181819) internal successors, (340), 176 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:14,311 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2022-11-03 02:51:14,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-03 02:51:14,312 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:51:14,312 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-03 02:51:14,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-03 02:51:14,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-03 02:51:14,513 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:51:14,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:51:14,513 INFO L85 PathProgramCache]: Analyzing trace with hash 768354714, now seen corresponding path program 39 times [2022-11-03 02:51:14,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:51:14,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053222801] [2022-11-03 02:51:14,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:51:14,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:51:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:51:16,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 378 proven. 1164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:16,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:51:16,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053222801] [2022-11-03 02:51:16,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053222801] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:51:16,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299224373] [2022-11-03 02:51:16,501 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:51:16,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:51:16,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:51:16,502 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:51:16,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-03 02:51:16,605 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:51:16,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:51:16,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-03 02:51:16,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:51:18,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:18,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:51:20,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:20,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299224373] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:51:20,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185561366] [2022-11-03 02:51:20,656 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:51:20,657 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:51:20,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:51:20,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:51:20,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:51:20,730 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:51:21,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37333#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:51:21,498 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:51:21,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:51:21,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2022-11-03 02:51:21,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970234324] [2022-11-03 02:51:21,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:51:21,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-03 02:51:21,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:51:21,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-03 02:51:21,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2293, Invalid=13207, Unknown=0, NotChecked=0, Total=15500 [2022-11-03 02:51:21,502 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:25,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:51:25,388 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2022-11-03 02:51:25,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-03 02:51:25,389 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2022-11-03 02:51:25,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:51:25,390 INFO L225 Difference]: With dead ends: 234 [2022-11-03 02:51:25,390 INFO L226 Difference]: Without dead ends: 232 [2022-11-03 02:51:25,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 254 SyntacticMatches, 29 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11434 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=5479, Invalid=27827, Unknown=0, NotChecked=0, Total=33306 [2022-11-03 02:51:25,392 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 237 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1534 mSolverCounterSat, 466 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 466 IncrementalHoareTripleChecker+Valid, 1534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:51:25,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 86 Invalid, 2000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [466 Valid, 1534 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:51:25,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-03 02:51:25,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 120. [2022-11-03 02:51:25,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:25,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-11-03 02:51:25,666 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2022-11-03 02:51:25,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:51:25,666 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-11-03 02:51:25,666 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:51:25,666 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-11-03 02:51:25,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-03 02:51:25,667 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:51:25,667 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-03 02:51:25,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-03 02:51:25,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-03 02:51:25,869 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:51:25,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:51:25,869 INFO L85 PathProgramCache]: Analyzing trace with hash -2115577660, now seen corresponding path program 40 times [2022-11-03 02:51:25,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:51:25,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383764494] [2022-11-03 02:51:25,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:51:25,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:51:25,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:51:30,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1080 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:30,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:51:30,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383764494] [2022-11-03 02:51:30,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383764494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:51:30,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918243271] [2022-11-03 02:51:30,286 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:51:30,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:51:30,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:51:30,287 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:51:30,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-03 02:51:30,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:51:30,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 121 conjunts are in the unsatisfiable core [2022-11-03 02:51:30,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:51:33,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:33,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:51:41,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:51:41,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918243271] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:51:41,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1935517843] [2022-11-03 02:51:41,408 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:51:41,408 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:51:41,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:51:41,409 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:51:41,409 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:51:41,507 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:51:42,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38926#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:51:42,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:51:42,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:51:42,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 153 [2022-11-03 02:51:42,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000397377] [2022-11-03 02:51:42,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:51:42,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-03 02:51:42,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:51:42,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-03 02:51:42,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3354, Invalid=21768, Unknown=0, NotChecked=0, Total=25122 [2022-11-03 02:51:42,862 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:52:14,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:52:14,155 INFO L93 Difference]: Finished difference Result 330 states and 363 transitions. [2022-11-03 02:52:14,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2022-11-03 02:52:14,156 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2022-11-03 02:52:14,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:52:14,157 INFO L225 Difference]: With dead ends: 330 [2022-11-03 02:52:14,157 INFO L226 Difference]: Without dead ends: 238 [2022-11-03 02:52:14,160 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 260 SyntacticMatches, 1 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20783 ImplicationChecksByTransitivity, 37.8s TimeCoverageRelationStatistics Valid=10001, Invalid=67561, Unknown=0, NotChecked=0, Total=77562 [2022-11-03 02:52:14,160 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 699 mSDsluCounter, 914 mSDsCounter, 0 mSdLazyCounter, 7782 mSolverCounterSat, 1162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 699 SdHoareTripleChecker+Valid, 916 SdHoareTripleChecker+Invalid, 8944 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1162 IncrementalHoareTripleChecker+Valid, 7782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:52:14,161 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [699 Valid, 916 Invalid, 8944 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1162 Valid, 7782 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-03 02:52:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-11-03 02:52:14,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 153. [2022-11-03 02:52:14,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.2039473684210527) internal successors, (183), 152 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:52:14,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2022-11-03 02:52:14,626 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 119 [2022-11-03 02:52:14,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:52:14,626 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2022-11-03 02:52:14,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:52:14,626 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2022-11-03 02:52:14,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:52:14,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:52:14,627 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-03 02:52:14,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-03 02:52:14,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:52:14,828 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:52:14,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:52:14,828 INFO L85 PathProgramCache]: Analyzing trace with hash -287448774, now seen corresponding path program 41 times [2022-11-03 02:52:14,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:52:14,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398758210] [2022-11-03 02:52:14,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:52:14,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:52:14,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:52:19,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1162 proven. 579 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:52:19,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:52:19,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398758210] [2022-11-03 02:52:19,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398758210] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:52:19,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89136316] [2022-11-03 02:52:19,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:52:19,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:52:19,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:52:19,645 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:52:19,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-03 02:52:19,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-03 02:52:19,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:52:19,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-03 02:52:19,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:52:25,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:52:25,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:52:35,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:52:35,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89136316] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:52:35,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197918869] [2022-11-03 02:52:35,335 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:52:35,335 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:52:35,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:52:35,336 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:52:35,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:52:35,426 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:52:37,046 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40930#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:52:37,047 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:52:37,047 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:52:37,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 188 [2022-11-03 02:52:37,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669753850] [2022-11-03 02:52:37,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:52:37,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2022-11-03 02:52:37,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:52:37,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2022-11-03 02:52:37,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4100, Invalid=33342, Unknown=0, NotChecked=0, Total=37442 [2022-11-03 02:52:37,051 INFO L87 Difference]: Start difference. First operand 153 states and 183 transitions. Second operand has 188 states, 188 states have (on average 1.9361702127659575) internal successors, (364), 188 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:06,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:53:06,361 INFO L93 Difference]: Finished difference Result 251 states and 282 transitions. [2022-11-03 02:53:06,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-03 02:53:06,362 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 1.9361702127659575) internal successors, (364), 188 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2022-11-03 02:53:06,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:53:06,363 INFO L225 Difference]: With dead ends: 251 [2022-11-03 02:53:06,363 INFO L226 Difference]: Without dead ends: 156 [2022-11-03 02:53:06,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17448 ImplicationChecksByTransitivity, 43.3s TimeCoverageRelationStatistics Valid=7188, Invalid=58604, Unknown=0, NotChecked=0, Total=65792 [2022-11-03 02:53:06,368 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 98 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 4215 mSolverCounterSat, 600 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 4815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 600 IncrementalHoareTripleChecker+Valid, 4215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:53:06,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 115 Invalid, 4815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [600 Valid, 4215 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-11-03 02:53:06,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-03 02:53:06,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2022-11-03 02:53:06,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.1973684210526316) internal successors, (182), 152 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:06,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2022-11-03 02:53:06,930 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 123 [2022-11-03 02:53:06,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:53:06,930 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2022-11-03 02:53:06,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 1.9361702127659575) internal successors, (364), 188 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:06,931 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2022-11-03 02:53:06,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 02:53:06,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:53:06,931 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-03 02:53:06,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-11-03 02:53:07,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:53:07,132 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:53:07,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:53:07,132 INFO L85 PathProgramCache]: Analyzing trace with hash -984818342, now seen corresponding path program 42 times [2022-11-03 02:53:07,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:53:07,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049661154] [2022-11-03 02:53:07,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:53:07,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:53:07,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:53:09,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 435 proven. 1337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:09,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:53:09,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049661154] [2022-11-03 02:53:09,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049661154] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:53:09,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781266585] [2022-11-03 02:53:09,678 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:53:09,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:53:09,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:53:09,683 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:53:09,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-03 02:53:09,827 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:53:09,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:53:09,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-03 02:53:09,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:53:12,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:12,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:53:14,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:14,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781266585] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:53:14,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [47009587] [2022-11-03 02:53:14,909 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:53:14,909 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:53:14,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:53:14,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:53:14,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:53:14,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:53:15,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42633#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:53:15,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:53:15,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:53:15,859 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2022-11-03 02:53:15,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263186125] [2022-11-03 02:53:15,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:53:15,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-03 02:53:15,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:53:15,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-03 02:53:15,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2604, Invalid=14952, Unknown=0, NotChecked=0, Total=17556 [2022-11-03 02:53:15,862 INFO L87 Difference]: Start difference. First operand 153 states and 182 transitions. Second operand has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:20,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:53:20,672 INFO L93 Difference]: Finished difference Result 250 states and 280 transitions. [2022-11-03 02:53:20,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-03 02:53:20,672 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2022-11-03 02:53:20,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:53:20,674 INFO L225 Difference]: With dead ends: 250 [2022-11-03 02:53:20,674 INFO L226 Difference]: Without dead ends: 248 [2022-11-03 02:53:20,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 272 SyntacticMatches, 31 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13030 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=6227, Invalid=31603, Unknown=0, NotChecked=0, Total=37830 [2022-11-03 02:53:20,676 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 285 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 1793 mSolverCounterSat, 528 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 2321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 528 IncrementalHoareTripleChecker+Valid, 1793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:53:20,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 92 Invalid, 2321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [528 Valid, 1793 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 02:53:20,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-11-03 02:53:21,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 128. [2022-11-03 02:53:21,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:21,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-11-03 02:53:21,057 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 124 [2022-11-03 02:53:21,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:53:21,057 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-11-03 02:53:21,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:53:21,058 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-11-03 02:53:21,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-03 02:53:21,058 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:53:21,059 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-11-03 02:53:21,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-03 02:53:21,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-03 02:53:21,259 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:53:21,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:53:21,260 INFO L85 PathProgramCache]: Analyzing trace with hash 203197700, now seen corresponding path program 43 times [2022-11-03 02:53:21,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:53:21,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735147929] [2022-11-03 02:53:21,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:53:21,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:53:21,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:53:26,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1247 proven. 614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:26,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:53:26,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735147929] [2022-11-03 02:53:26,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735147929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:53:26,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911708317] [2022-11-03 02:53:26,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:53:26,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:53:26,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:53:26,769 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:53:26,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-03 02:53:26,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:53:26,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 129 conjunts are in the unsatisfiable core [2022-11-03 02:53:26,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:53:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:30,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:53:40,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:53:40,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911708317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:53:40,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835479583] [2022-11-03 02:53:40,241 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:53:40,241 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:53:40,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:53:40,242 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:53:40,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:53:40,326 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:53:41,719 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44334#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:53:41,719 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:53:41,720 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:53:41,720 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 163 [2022-11-03 02:53:41,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603665171] [2022-11-03 02:53:41,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:53:41,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-03 02:53:41,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:53:41,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-03 02:53:41,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3799, Invalid=24593, Unknown=0, NotChecked=0, Total=28392 [2022-11-03 02:53:41,724 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:54:22,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:54:22,810 INFO L93 Difference]: Finished difference Result 352 states and 387 transitions. [2022-11-03 02:54:22,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2022-11-03 02:54:22,811 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2022-11-03 02:54:22,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:54:22,813 INFO L225 Difference]: With dead ends: 352 [2022-11-03 02:54:22,813 INFO L226 Difference]: Without dead ends: 254 [2022-11-03 02:54:22,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 278 SyntacticMatches, 1 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23579 ImplicationChecksByTransitivity, 48.7s TimeCoverageRelationStatistics Valid=11336, Invalid=76576, Unknown=0, NotChecked=0, Total=87912 [2022-11-03 02:54:22,817 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 786 mSDsluCounter, 1037 mSDsCounter, 0 mSdLazyCounter, 8745 mSolverCounterSat, 1271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 786 SdHoareTripleChecker+Valid, 1038 SdHoareTripleChecker+Invalid, 10016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1271 IncrementalHoareTripleChecker+Valid, 8745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:54:22,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [786 Valid, 1038 Invalid, 10016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1271 Valid, 8745 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2022-11-03 02:54:22,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-11-03 02:54:23,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 163. [2022-11-03 02:54:23,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.2037037037037037) internal successors, (195), 162 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:54:23,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 195 transitions. [2022-11-03 02:54:23,465 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 195 transitions. Word has length 127 [2022-11-03 02:54:23,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:54:23,466 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 195 transitions. [2022-11-03 02:54:23,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:54:23,466 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 195 transitions. [2022-11-03 02:54:23,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-03 02:54:23,466 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:54:23,467 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-11-03 02:54:23,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-03 02:54:23,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-03 02:54:23,667 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:54:23,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:54:23,668 INFO L85 PathProgramCache]: Analyzing trace with hash -991238918, now seen corresponding path program 44 times [2022-11-03 02:54:23,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:54:23,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264357898] [2022-11-03 02:54:23,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:54:23,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:54:23,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:54:29,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 1335 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:54:29,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:54:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264357898] [2022-11-03 02:54:29,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264357898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:54:29,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120620940] [2022-11-03 02:54:29,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:54:29,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:54:29,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:54:29,644 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:54:29,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d825547-c157-4eef-bbcb-7510444b68f6/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-03 02:54:29,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-11-03 02:54:29,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:54:29,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-03 02:54:29,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:54:37,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:54:37,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:54:49,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:54:49,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120620940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:54:49,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1057228476] [2022-11-03 02:54:49,256 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-03 02:54:49,256 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:54:49,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:54:49,257 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:54:49,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:54:49,339 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:54:50,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46470#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:54:50,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:54:50,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:54:50,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 68, 68] total 200 [2022-11-03 02:54:50,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157483662] [2022-11-03 02:54:50,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:54:50,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 200 states [2022-11-03 02:54:50,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:54:50,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2022-11-03 02:54:50,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4626, Invalid=37604, Unknown=0, NotChecked=0, Total=42230 [2022-11-03 02:54:50,845 INFO L87 Difference]: Start difference. First operand 163 states and 195 transitions. Second operand has 200 states, 200 states have (on average 1.94) internal successors, (388), 200 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)