./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs --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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 15:48:20,461 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 15:48:20,464 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 15:48:20,530 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 15:48:20,531 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 15:48:20,532 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 15:48:20,535 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 15:48:20,538 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 15:48:20,541 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 15:48:20,543 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 15:48:20,544 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 15:48:20,547 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 15:48:20,548 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 15:48:20,550 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 15:48:20,552 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 15:48:20,554 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 15:48:20,556 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 15:48:20,558 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 15:48:20,562 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 15:48:20,565 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 15:48:20,569 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 15:48:20,571 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 15:48:20,574 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 15:48:20,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 15:48:20,581 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 15:48:20,582 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 15:48:20,582 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 15:48:20,584 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 15:48:20,585 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 15:48:20,587 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 15:48:20,588 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 15:48:20,589 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 15:48:20,590 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 15:48:20,592 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 15:48:20,594 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 15:48:20,594 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 15:48:20,596 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 15:48:20,596 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 15:48:20,597 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 15:48:20,599 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 15:48:20,600 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 15:48:20,601 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 15:48:20,632 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 15:48:20,633 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 15:48:20,634 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 15:48:20,634 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 15:48:20,635 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 15:48:20,635 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 15:48:20,635 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 15:48:20,636 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 15:48:20,636 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 15:48:20,636 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 15:48:20,637 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 15:48:20,637 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 15:48:20,637 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 15:48:20,638 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 15:48:20,638 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 15:48:20,638 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 15:48:20,639 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 15:48:20,640 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 15:48:20,640 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 15:48:20,640 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 15:48:20,640 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 15:48:20,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 15:48:20,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 15:48:20,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 15:48:20,642 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 15:48:20,642 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 15:48:20,642 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 15:48:20,643 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 15:48:20,643 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 15:48:20,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 15:48:20,644 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 15:48:20,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:48:20,644 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 15:48:20,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 15:48:20,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 15:48:20,645 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 15:48:20,646 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 15:48:20,646 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 15:48:20,646 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 15:48:20,646 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 15:48:20,647 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2021-11-19 15:48:20,944 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 15:48:20,967 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 15:48:20,970 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 15:48:20,972 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 15:48:20,973 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 15:48:20,975 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-19 15:48:21,067 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/data/049d845ea/b04c5f876fbc446695290be5dc687b59/FLAGcd8c1a2d5 [2021-11-19 15:48:21,625 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 15:48:21,626 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-19 15:48:21,634 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/data/049d845ea/b04c5f876fbc446695290be5dc687b59/FLAGcd8c1a2d5 [2021-11-19 15:48:21,978 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/data/049d845ea/b04c5f876fbc446695290be5dc687b59 [2021-11-19 15:48:21,981 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 15:48:21,983 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 15:48:21,988 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 15:48:21,988 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 15:48:21,991 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 15:48:21,992 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:48:21" (1/1) ... [2021-11-19 15:48:21,994 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d7698e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:21, skipping insertion in model container [2021-11-19 15:48:21,994 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:48:21" (1/1) ... [2021-11-19 15:48:22,003 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 15:48:22,030 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 15:48:22,256 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_c2365d71-87ce-44ce-b14f-d730ebb92a37/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-19 15:48:22,278 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:48:22,294 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 15:48:22,324 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_c2365d71-87ce-44ce-b14f-d730ebb92a37/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-19 15:48:22,340 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:48:22,367 INFO L208 MainTranslator]: Completed translation [2021-11-19 15:48:22,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22 WrapperNode [2021-11-19 15:48:22,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 15:48:22,369 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 15:48:22,369 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 15:48:22,369 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 15:48:22,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,419 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-19 15:48:22,420 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 15:48:22,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 15:48:22,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 15:48:22,423 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 15:48:22,434 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,434 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,449 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,450 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,454 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,460 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,463 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 15:48:22,464 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 15:48:22,464 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 15:48:22,464 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 15:48:22,466 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (1/1) ... [2021-11-19 15:48:22,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:48:22,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:22,506 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 15:48:22,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 15:48:22,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 15:48:22,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 15:48:22,582 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 15:48:22,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 15:48:22,671 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 15:48:22,673 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 15:48:22,876 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 15:48:22,895 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 15:48:22,895 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-19 15:48:22,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:48:22 BoogieIcfgContainer [2021-11-19 15:48:22,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 15:48:22,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 15:48:22,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 15:48:22,904 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 15:48:22,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 03:48:21" (1/3) ... [2021-11-19 15:48:22,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8fde75d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:48:22, skipping insertion in model container [2021-11-19 15:48:22,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:22" (2/3) ... [2021-11-19 15:48:22,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8fde75d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:48:22, skipping insertion in model container [2021-11-19 15:48:22,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:48:22" (3/3) ... [2021-11-19 15:48:22,908 INFO L111 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2021-11-19 15:48:22,914 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 15:48:22,914 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 15:48:22,974 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 15:48:22,984 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-19 15:48:22,984 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 15:48:23,002 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 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) [2021-11-19 15:48:23,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-19 15:48:23,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:23,009 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:23,010 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:23,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:23,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2021-11-19 15:48:23,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:23,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559402446] [2021-11-19 15:48:23,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:23,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:23,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:23,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:23,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:23,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559402446] [2021-11-19 15:48:23,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559402446] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:23,199 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:48:23,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 15:48:23,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738932810] [2021-11-19 15:48:23,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:23,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-19 15:48:23,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:23,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-19 15:48:23,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-19 15:48:23,257 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 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) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-11-19 15:48:23,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:23,317 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-19 15:48:23,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-19 15:48:23,320 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 8 [2021-11-19 15:48:23,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:23,328 INFO L225 Difference]: With dead ends: 27 [2021-11-19 15:48:23,329 INFO L226 Difference]: Without dead ends: 13 [2021-11-19 15:48:23,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-19 15:48:23,347 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:23,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:48:23,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-19 15:48:23,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-19 15:48:23,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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) [2021-11-19 15:48:23,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-19 15:48:23,424 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2021-11-19 15:48:23,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:23,424 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-19 15:48:23,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-11-19 15:48:23,425 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-19 15:48:23,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-19 15:48:23,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:23,426 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:23,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 15:48:23,426 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:23,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:23,427 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2021-11-19 15:48:23,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:23,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488063405] [2021-11-19 15:48:23,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:23,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:23,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:23,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:23,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:23,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488063405] [2021-11-19 15:48:23,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488063405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:23,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:48:23,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:48:23,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753591869] [2021-11-19 15:48:23,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:23,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 15:48:23,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:23,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 15:48:23,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 15:48:23,609 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2021-11-19 15:48:23,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:23,673 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-11-19 15:48:23,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:48:23,675 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 10 [2021-11-19 15:48:23,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:23,676 INFO L225 Difference]: With dead ends: 18 [2021-11-19 15:48:23,676 INFO L226 Difference]: Without dead ends: 16 [2021-11-19 15:48:23,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 15:48:23,686 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:23,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 21 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:48:23,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-19 15:48:23,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-19 15:48:23,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2021-11-19 15:48:23,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-19 15:48:23,693 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2021-11-19 15:48:23,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:23,693 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-19 15:48:23,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2021-11-19 15:48:23,694 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-19 15:48:23,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-19 15:48:23,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:23,698 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:23,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 15:48:23,698 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:23,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:23,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2021-11-19 15:48:23,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:23,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272541578] [2021-11-19 15:48:23,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:23,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:23,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:23,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:23,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:23,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272541578] [2021-11-19 15:48:23,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272541578] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:23,793 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:48:23,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-19 15:48:23,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994030314] [2021-11-19 15:48:23,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:23,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 15:48:23,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:23,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 15:48:23,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 15:48:23,799 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-19 15:48:23,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:23,878 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-19 15:48:23,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:48:23,879 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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 14 [2021-11-19 15:48:23,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:23,880 INFO L225 Difference]: With dead ends: 31 [2021-11-19 15:48:23,881 INFO L226 Difference]: Without dead ends: 20 [2021-11-19 15:48:23,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 15:48:23,883 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:23,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:23,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-19 15:48:23,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-19 15:48:23,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 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) [2021-11-19 15:48:23,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-19 15:48:23,891 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2021-11-19 15:48:23,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:23,892 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-19 15:48:23,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-19 15:48:23,892 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-19 15:48:23,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-19 15:48:23,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:23,893 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:23,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 15:48:23,894 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:23,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:23,896 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2021-11-19 15:48:23,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:23,896 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770400352] [2021-11-19 15:48:23,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:23,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:23,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:24,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:24,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770400352] [2021-11-19 15:48:24,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770400352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:24,023 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194614199] [2021-11-19 15:48:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:24,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:24,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:24,026 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:24,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 15:48:24,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:24,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 15:48:24,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:24,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:24,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:24,430 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:24,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194614199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:24,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449894732] [2021-11-19 15:48:24,453 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:24,453 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:24,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:24,464 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:24,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:24,505 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:24,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:24,526 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,562 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:24,569 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,575 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:24,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:24,591 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:24,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:48:24,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,733 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:24,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:24,760 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:24,764 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:24,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:24,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:24,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:24,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:24,893 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:24,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:24,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:24,983 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:24,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:24,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:25,044 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:25,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:25,065 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:25,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:25,075 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:25,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:25,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:25,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2021-11-19 15:48:25,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584123893] [2021-11-19 15:48:25,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:25,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 15:48:25,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:25,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 15:48:25,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-19 15:48:25,716 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 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) [2021-11-19 15:48:26,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:26,017 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-19 15:48:26,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 15:48:26,018 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 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 [2021-11-19 15:48:26,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:26,021 INFO L225 Difference]: With dead ends: 41 [2021-11-19 15:48:26,021 INFO L226 Difference]: Without dead ends: 30 [2021-11-19 15:48:26,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-11-19 15:48:26,027 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:26,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 41 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:26,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-19 15:48:26,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2021-11-19 15:48:26,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 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) [2021-11-19 15:48:26,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-19 15:48:26,042 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-11-19 15:48:26,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:26,043 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-19 15:48:26,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 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) [2021-11-19 15:48:26,043 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-19 15:48:26,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-19 15:48:26,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:26,045 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:26,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:26,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:26,254 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:26,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:26,255 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2021-11-19 15:48:26,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:26,255 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616193641] [2021-11-19 15:48:26,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:26,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:26,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:26,372 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:26,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:26,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616193641] [2021-11-19 15:48:26,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616193641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:26,373 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273869805] [2021-11-19 15:48:26,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:48:26,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:26,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:26,374 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:26,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 15:48:26,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-19 15:48:26,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:26,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-19 15:48:26,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:26,635 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:26,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:26,740 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:26,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273869805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:26,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [62788500] [2021-11-19 15:48:26,745 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:26,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:26,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:26,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:26,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:26,760 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:26,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:26,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,784 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:26,785 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:26,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:26,803 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:26,811 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:48:26,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,844 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:26,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:26,861 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:26,865 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:26,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:26,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:26,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:26,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,926 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,931 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:48:26,941 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:26,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:48:26,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:26,998 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:27,011 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:27,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:27,044 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:27,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:27,058 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:27,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:27,067 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:27,669 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:27,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:27,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 16 [2021-11-19 15:48:27,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304048758] [2021-11-19 15:48:27,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:27,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 15:48:27,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:27,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 15:48:27,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-11-19 15:48:27,672 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 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) [2021-11-19 15:48:28,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:28,020 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-11-19 15:48:28,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 15:48:28,023 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 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 22 [2021-11-19 15:48:28,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:28,028 INFO L225 Difference]: With dead ends: 54 [2021-11-19 15:48:28,031 INFO L226 Difference]: Without dead ends: 39 [2021-11-19 15:48:28,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 15:48:28,035 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 52 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:28,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 62 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:28,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-19 15:48:28,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2021-11-19 15:48:28,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 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) [2021-11-19 15:48:28,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-19 15:48:28,053 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2021-11-19 15:48:28,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:28,053 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-19 15:48:28,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 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) [2021-11-19 15:48:28,054 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-19 15:48:28,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 15:48:28,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:28,056 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:28,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:28,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-19 15:48:28,282 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:28,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:28,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1367196232, now seen corresponding path program 3 times [2021-11-19 15:48:28,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:28,283 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951915279] [2021-11-19 15:48:28,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:28,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:28,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:28,434 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:28,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:28,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951915279] [2021-11-19 15:48:28,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951915279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:28,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417079657] [2021-11-19 15:48:28,435 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:48:28,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:28,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:28,441 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:28,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 15:48:28,492 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:48:28,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:28,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 15:48:28,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:28,612 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:28,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:28,696 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:28,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417079657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:28,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447416889] [2021-11-19 15:48:28,706 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:28,707 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:28,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:28,707 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:28,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:28,728 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:28,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:28,733 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,748 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:28,750 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:28,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:28,760 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:28,774 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:48:28,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,818 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:28,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:28,831 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:28,835 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:28,836 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,839 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:28,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:28,845 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:28,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,892 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,897 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:28,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:28,907 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:28,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,944 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:28,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:28,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:28,975 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:28,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:28,990 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:28,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:28,997 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:29,507 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:29,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:29,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 15 [2021-11-19 15:48:29,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091844711] [2021-11-19 15:48:29,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:29,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 15:48:29,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:29,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 15:48:29,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-19 15:48:29,510 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 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) [2021-11-19 15:48:29,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:29,882 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-11-19 15:48:29,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-19 15:48:29,883 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 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 28 [2021-11-19 15:48:29,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:29,885 INFO L225 Difference]: With dead ends: 69 [2021-11-19 15:48:29,885 INFO L226 Difference]: Without dead ends: 50 [2021-11-19 15:48:29,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-19 15:48:29,887 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 58 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:29,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 52 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:29,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-19 15:48:29,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2021-11-19 15:48:29,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 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) [2021-11-19 15:48:29,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-11-19 15:48:29,896 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-11-19 15:48:29,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:29,896 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-11-19 15:48:29,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 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) [2021-11-19 15:48:29,897 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-11-19 15:48:29,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-19 15:48:29,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:29,899 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:29,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:30,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:30,114 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:30,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:30,114 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 4 times [2021-11-19 15:48:30,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:30,115 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588274984] [2021-11-19 15:48:30,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:30,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:30,295 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:30,295 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:30,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588274984] [2021-11-19 15:48:30,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588274984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:30,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584733815] [2021-11-19 15:48:30,296 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:48:30,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:30,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:30,297 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:30,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 15:48:30,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:30,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 15:48:30,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:30,593 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:30,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:30,707 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:30,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584733815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:30,708 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423120133] [2021-11-19 15:48:30,711 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:30,711 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:30,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:30,712 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:30,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:30,721 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:30,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:30,726 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,731 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:30,732 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,735 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:30,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:30,740 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:30,744 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:48:30,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,766 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:30,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:30,776 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:30,778 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:30,779 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,782 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:30,783 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:30,786 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:30,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,810 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:30,817 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:30,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:30,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,852 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:30,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:30,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:30,875 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:30,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:30,885 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:30,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:30,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:31,377 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:31,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:31,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-19 15:48:31,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483226106] [2021-11-19 15:48:31,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:31,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 15:48:31,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:31,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 15:48:31,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-19 15:48:31,380 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 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) [2021-11-19 15:48:31,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:31,548 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-11-19 15:48:31,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 15:48:31,549 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 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 34 [2021-11-19 15:48:31,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:31,550 INFO L225 Difference]: With dead ends: 75 [2021-11-19 15:48:31,550 INFO L226 Difference]: Without dead ends: 52 [2021-11-19 15:48:31,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 15:48:31,552 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:31,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 94 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:31,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-19 15:48:31,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2021-11-19 15:48:31,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 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) [2021-11-19 15:48:31,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-19 15:48:31,559 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2021-11-19 15:48:31,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:31,559 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-19 15:48:31,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 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) [2021-11-19 15:48:31,560 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-19 15:48:31,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-19 15:48:31,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:31,561 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:31,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:31,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-19 15:48:31,774 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:31,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:31,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 5 times [2021-11-19 15:48:31,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:31,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865166651] [2021-11-19 15:48:31,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:31,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:31,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:31,867 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:31,867 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:31,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865166651] [2021-11-19 15:48:31,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865166651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:31,868 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338643015] [2021-11-19 15:48:31,868 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:48:31,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:31,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:31,869 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:31,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 15:48:31,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-19 15:48:31,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:31,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 15:48:31,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:32,036 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:32,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:32,138 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:32,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338643015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:32,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [855986476] [2021-11-19 15:48:32,141 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:32,141 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:32,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:32,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:32,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:32,150 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:32,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:32,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,157 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:32,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:32,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:32,164 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:32,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:48:32,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,185 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:32,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:32,193 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:32,195 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:32,197 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:32,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:32,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,210 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:32,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,229 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,231 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:32,234 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:32,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:32,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,271 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:32,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:32,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:32,296 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:32,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:32,310 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:32,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:32,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:32,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:32,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:32,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2021-11-19 15:48:32,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851638965] [2021-11-19 15:48:32,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:32,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 15:48:32,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:32,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 15:48:32,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-11-19 15:48:32,711 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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) [2021-11-19 15:48:32,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:32,854 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-11-19 15:48:32,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-19 15:48:32,854 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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 36 [2021-11-19 15:48:32,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:32,855 INFO L225 Difference]: With dead ends: 54 [2021-11-19 15:48:32,855 INFO L226 Difference]: Without dead ends: 52 [2021-11-19 15:48:32,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2021-11-19 15:48:32,857 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:32,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 73 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:32,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-19 15:48:32,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2021-11-19 15:48:32,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 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) [2021-11-19 15:48:32,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-11-19 15:48:32,863 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2021-11-19 15:48:32,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:32,864 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-11-19 15:48:32,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 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) [2021-11-19 15:48:32,864 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-11-19 15:48:32,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-19 15:48:32,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:32,865 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:32,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:33,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-11-19 15:48:33,066 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:33,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:33,067 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 6 times [2021-11-19 15:48:33,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:33,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908298606] [2021-11-19 15:48:33,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:33,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:33,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:33,221 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:33,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:33,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908298606] [2021-11-19 15:48:33,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908298606] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:33,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839524638] [2021-11-19 15:48:33,222 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:48:33,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:33,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:33,223 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:33,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 15:48:33,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:48:33,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:33,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 15:48:33,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:33,584 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:33,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:33,719 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:33,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839524638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:33,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936071508] [2021-11-19 15:48:33,722 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:33,722 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:33,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:33,723 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:33,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:33,732 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:33,734 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:33,736 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,739 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:33,740 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:33,743 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:33,746 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:33,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:48:33,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,773 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:33,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:33,782 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:33,793 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:33,794 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:33,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:33,801 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:33,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,859 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:48:33,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:33,868 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:48:33,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,901 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:33,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:33,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:33,922 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:33,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:33,932 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:33,938 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:33,940 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:34,505 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:34,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:34,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-11-19 15:48:34,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187950964] [2021-11-19 15:48:34,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:34,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 15:48:34,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:34,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 15:48:34,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2021-11-19 15:48:34,508 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 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) [2021-11-19 15:48:34,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:34,903 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2021-11-19 15:48:34,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 15:48:34,903 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 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 [2021-11-19 15:48:34,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:34,904 INFO L225 Difference]: With dead ends: 124 [2021-11-19 15:48:34,904 INFO L226 Difference]: Without dead ends: 70 [2021-11-19 15:48:34,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=422, Invalid=1834, Unknown=0, NotChecked=0, Total=2256 [2021-11-19 15:48:34,907 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 70 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:34,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 146 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:48:34,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-19 15:48:34,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2021-11-19 15:48:34,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 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) [2021-11-19 15:48:34,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-11-19 15:48:34,916 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-11-19 15:48:34,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:34,916 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-11-19 15:48:34,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 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) [2021-11-19 15:48:34,917 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-11-19 15:48:34,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-19 15:48:34,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:34,924 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:34,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:35,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2021-11-19 15:48:35,150 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:35,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:35,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 7 times [2021-11-19 15:48:35,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:35,151 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782553929] [2021-11-19 15:48:35,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:35,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:35,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:35,296 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:35,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:35,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782553929] [2021-11-19 15:48:35,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782553929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:35,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133106978] [2021-11-19 15:48:35,297 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:48:35,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:35,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:35,299 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:35,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 15:48:35,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:35,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 15:48:35,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:35,523 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:35,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:35,679 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:35,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133106978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:35,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [868497158] [2021-11-19 15:48:35,688 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:35,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:35,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:35,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:35,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:35,705 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:35,708 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:35,711 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,715 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:35,716 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,718 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:35,719 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:35,723 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:35,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:48:35,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,748 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:35,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:35,757 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:35,760 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:35,761 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,763 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:35,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:35,772 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:35,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:35,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:35,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:35,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,837 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:35,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:35,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:35,862 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:35,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:35,871 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:35,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:35,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:36,346 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:36,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:36,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2021-11-19 15:48:36,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480497978] [2021-11-19 15:48:36,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:36,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-19 15:48:36,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:36,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-19 15:48:36,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-11-19 15:48:36,348 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 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) [2021-11-19 15:48:36,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:36,526 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-11-19 15:48:36,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 15:48:36,527 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 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 48 [2021-11-19 15:48:36,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:36,528 INFO L225 Difference]: With dead ends: 66 [2021-11-19 15:48:36,528 INFO L226 Difference]: Without dead ends: 64 [2021-11-19 15:48:36,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=245, Invalid=811, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 15:48:36,530 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:36,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 93 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:36,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-19 15:48:36,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2021-11-19 15:48:36,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 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) [2021-11-19 15:48:36,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-11-19 15:48:36,538 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2021-11-19 15:48:36,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:36,539 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-11-19 15:48:36,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 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) [2021-11-19 15:48:36,539 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-11-19 15:48:36,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 15:48:36,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:36,540 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:36,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:36,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:36,750 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:36,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:36,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 8 times [2021-11-19 15:48:36,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:36,751 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077522507] [2021-11-19 15:48:36,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:36,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:36,998 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:36,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:36,998 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077522507] [2021-11-19 15:48:36,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077522507] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:36,998 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813557966] [2021-11-19 15:48:36,999 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:48:36,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:36,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:37,002 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:37,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 15:48:37,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-19 15:48:37,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:37,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-19 15:48:37,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:37,582 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:37,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:37,778 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:37,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813557966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:37,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618727462] [2021-11-19 15:48:37,780 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:37,781 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:37,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:37,781 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:37,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:37,789 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:37,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:37,793 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,796 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:37,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:37,800 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:37,804 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:37,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:48:37,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,825 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:37,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:37,833 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:37,835 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:37,836 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:37,839 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:37,847 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:37,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:37,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:37,877 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:37,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,926 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:37,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:37,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:37,945 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:37,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:37,953 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:37,956 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:37,958 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:38,392 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:38,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:38,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2021-11-19 15:48:38,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099399682] [2021-11-19 15:48:38,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:38,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 15:48:38,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:38,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 15:48:38,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1350, Unknown=0, NotChecked=0, Total=1640 [2021-11-19 15:48:38,396 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 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) [2021-11-19 15:48:38,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:38,882 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-11-19 15:48:38,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 15:48:38,883 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 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) Word has length 56 [2021-11-19 15:48:38,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:38,884 INFO L225 Difference]: With dead ends: 158 [2021-11-19 15:48:38,885 INFO L226 Difference]: Without dead ends: 88 [2021-11-19 15:48:38,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2021-11-19 15:48:38,888 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 96 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:38,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 171 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:48:38,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-19 15:48:38,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2021-11-19 15:48:38,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 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) [2021-11-19 15:48:38,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-19 15:48:38,898 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-11-19 15:48:38,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:38,899 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-19 15:48:38,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 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) [2021-11-19 15:48:38,899 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-19 15:48:38,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-19 15:48:38,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:38,901 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:38,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:39,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable178 [2021-11-19 15:48:39,106 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:39,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:39,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 9 times [2021-11-19 15:48:39,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:39,107 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668888357] [2021-11-19 15:48:39,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:39,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:39,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:39,280 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:39,280 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:39,280 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668888357] [2021-11-19 15:48:39,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668888357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:39,280 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076169851] [2021-11-19 15:48:39,280 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:48:39,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:39,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:39,282 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:39,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 15:48:39,391 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:48:39,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:39,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-19 15:48:39,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:39,582 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:39,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:39,754 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:39,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076169851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:39,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1369495243] [2021-11-19 15:48:39,757 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:39,757 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:39,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:39,758 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:39,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:39,767 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:39,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:39,772 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,774 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:39,775 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:39,778 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:39,781 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:39,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:48:39,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,804 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:39,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:39,812 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:39,814 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:39,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:39,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:39,825 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:39,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,850 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:48:39,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:39,858 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:48:39,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,896 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:39,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:39,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:39,916 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:39,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:39,925 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:39,928 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:39,930 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:40,449 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:40,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:40,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2021-11-19 15:48:40,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035390655] [2021-11-19 15:48:40,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:40,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 15:48:40,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:40,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 15:48:40,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2021-11-19 15:48:40,453 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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) [2021-11-19 15:48:40,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:40,695 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-11-19 15:48:40,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 15:48:40,696 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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) Word has length 60 [2021-11-19 15:48:40,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:40,698 INFO L225 Difference]: With dead ends: 78 [2021-11-19 15:48:40,698 INFO L226 Difference]: Without dead ends: 76 [2021-11-19 15:48:40,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=318, Invalid=1014, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 15:48:40,700 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 69 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:40,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 97 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:40,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-19 15:48:40,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2021-11-19 15:48:40,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 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) [2021-11-19 15:48:40,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-11-19 15:48:40,722 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2021-11-19 15:48:40,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:40,722 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-11-19 15:48:40,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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) [2021-11-19 15:48:40,723 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-11-19 15:48:40,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-19 15:48:40,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:40,732 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:40,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:40,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable203 [2021-11-19 15:48:40,949 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:40,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:40,950 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 10 times [2021-11-19 15:48:40,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:40,950 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513131111] [2021-11-19 15:48:40,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:40,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:40,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:41,275 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:41,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:41,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513131111] [2021-11-19 15:48:41,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513131111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:41,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361739352] [2021-11-19 15:48:41,276 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:48:41,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:41,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:41,277 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:41,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 15:48:41,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:41,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 15:48:41,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:41,846 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:48:41,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:42,048 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:48:42,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361739352] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:42,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635790476] [2021-11-19 15:48:42,051 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:42,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:42,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:42,052 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:42,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:42,070 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:42,072 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:42,077 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,081 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:42,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:42,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:42,090 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:42,094 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:48:42,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,117 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:42,120 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:42,125 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:42,127 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:42,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:42,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:42,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:42,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,158 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,161 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:48:42,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:42,167 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:48:42,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,210 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:42,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:42,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:42,231 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:42,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:42,239 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:42,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:42,245 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:42,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:42,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:42,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2021-11-19 15:48:42,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7255595] [2021-11-19 15:48:42,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:42,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-19 15:48:42,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:42,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-19 15:48:42,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2021-11-19 15:48:42,767 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 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) [2021-11-19 15:48:43,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:43,056 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2021-11-19 15:48:43,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 15:48:43,056 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 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 [2021-11-19 15:48:43,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:43,058 INFO L225 Difference]: With dead ends: 146 [2021-11-19 15:48:43,058 INFO L226 Difference]: Without dead ends: 101 [2021-11-19 15:48:43,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2021-11-19 15:48:43,069 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:43,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 204 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:43,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-19 15:48:43,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2021-11-19 15:48:43,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 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) [2021-11-19 15:48:43,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-11-19 15:48:43,088 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2021-11-19 15:48:43,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:43,090 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-11-19 15:48:43,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 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) [2021-11-19 15:48:43,090 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-11-19 15:48:43,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-19 15:48:43,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:43,091 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:43,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:43,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable228,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:43,306 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:43,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:43,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 11 times [2021-11-19 15:48:43,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:43,306 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275570015] [2021-11-19 15:48:43,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:43,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:43,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:43,612 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:43,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:43,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275570015] [2021-11-19 15:48:43,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275570015] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:43,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219227741] [2021-11-19 15:48:43,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:48:43,613 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:43,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:43,615 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:43,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 15:48:43,687 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-19 15:48:43,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:43,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-19 15:48:43,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:44,075 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:44,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:44,295 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:44,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219227741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:44,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595249792] [2021-11-19 15:48:44,299 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:44,299 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:44,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:44,300 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:44,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:44,309 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:44,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:44,315 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,318 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:44,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:44,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:44,325 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:44,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:48:44,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,360 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:44,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:44,370 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:44,372 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:44,372 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:44,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:44,378 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:44,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,398 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,400 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:44,403 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:44,406 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:44,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,439 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:44,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:44,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:44,457 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:44,459 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:44,466 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:44,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:44,470 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:45,137 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:45,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:45,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 36 [2021-11-19 15:48:45,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230417884] [2021-11-19 15:48:45,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:45,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-19 15:48:45,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:45,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-19 15:48:45,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 15:48:45,141 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 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) [2021-11-19 15:48:46,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:46,304 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2021-11-19 15:48:46,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-19 15:48:46,304 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 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 70 [2021-11-19 15:48:46,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:46,305 INFO L225 Difference]: With dead ends: 160 [2021-11-19 15:48:46,306 INFO L226 Difference]: Without dead ends: 113 [2021-11-19 15:48:46,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2466 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1184, Invalid=6648, Unknown=0, NotChecked=0, Total=7832 [2021-11-19 15:48:46,311 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 186 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:46,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 148 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:48:46,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-19 15:48:46,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2021-11-19 15:48:46,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 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) [2021-11-19 15:48:46,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-11-19 15:48:46,322 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 70 [2021-11-19 15:48:46,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:46,322 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-11-19 15:48:46,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 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) [2021-11-19 15:48:46,323 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-11-19 15:48:46,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-19 15:48:46,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:46,324 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:46,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:46,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable253,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:46,526 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:46,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:46,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1928614536, now seen corresponding path program 12 times [2021-11-19 15:48:46,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:46,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908036030] [2021-11-19 15:48:46,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:46,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:46,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:46,861 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:46,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:46,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908036030] [2021-11-19 15:48:46,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908036030] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:46,861 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875043909] [2021-11-19 15:48:46,861 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:48:46,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:46,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:46,863 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:46,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 15:48:46,940 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:48:46,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:46,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-19 15:48:46,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:47,413 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:47,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:47,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875043909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:47,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [438588022] [2021-11-19 15:48:47,672 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:47,681 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:47,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:47,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:47,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:47,705 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:47,707 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:47,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,713 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:47,714 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,717 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:47,718 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:47,721 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:47,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:48:47,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,749 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:47,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:47,761 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:47,762 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:47,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:47,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:47,773 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:47,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,793 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,795 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:47,798 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:47,801 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:47,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,845 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:47,848 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:47,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:47,882 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:47,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:47,893 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:47,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:47,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:48,628 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:48,629 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:48,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2021-11-19 15:48:48,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339849625] [2021-11-19 15:48:48,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:48,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-19 15:48:48,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:48,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-19 15:48:48,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1937, Unknown=0, NotChecked=0, Total=2256 [2021-11-19 15:48:48,632 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 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) [2021-11-19 15:48:49,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:49,859 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2021-11-19 15:48:49,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-19 15:48:49,860 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 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 [2021-11-19 15:48:49,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:49,861 INFO L225 Difference]: With dead ends: 173 [2021-11-19 15:48:49,861 INFO L226 Difference]: Without dead ends: 122 [2021-11-19 15:48:49,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1378, Invalid=7742, Unknown=0, NotChecked=0, Total=9120 [2021-11-19 15:48:49,866 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 170 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:49,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 177 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:48:49,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-19 15:48:49,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 83. [2021-11-19 15:48:49,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 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) [2021-11-19 15:48:49,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-11-19 15:48:49,876 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 76 [2021-11-19 15:48:49,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:49,877 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-11-19 15:48:49,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 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) [2021-11-19 15:48:49,877 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-11-19 15:48:49,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-19 15:48:49,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:49,878 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:49,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:50,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable278 [2021-11-19 15:48:50,086 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:50,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:50,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 13 times [2021-11-19 15:48:50,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:50,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897261656] [2021-11-19 15:48:50,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:50,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:50,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:50,556 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:50,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:50,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897261656] [2021-11-19 15:48:50,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897261656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:50,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146805920] [2021-11-19 15:48:50,557 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:48:50,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:50,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:50,559 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:50,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 15:48:50,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:50,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-19 15:48:50,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:51,384 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:51,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:51,630 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:51,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146805920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:51,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918122016] [2021-11-19 15:48:51,632 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:51,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:51,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:51,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:51,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:51,644 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:51,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:51,648 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,650 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:51,650 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,652 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:51,653 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:51,657 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:51,662 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:48:51,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,702 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:51,705 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:51,710 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:51,712 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:51,713 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:51,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:51,718 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:51,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,738 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:51,743 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:51,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:51,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,770 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:51,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:51,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:51,789 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:51,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:51,797 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:51,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:51,800 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:52,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:52,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:52,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-19 15:48:52,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425911666] [2021-11-19 15:48:52,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:52,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-19 15:48:52,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:52,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-19 15:48:52,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2021-11-19 15:48:52,360 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 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) [2021-11-19 15:48:52,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:52,834 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2021-11-19 15:48:52,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 15:48:52,834 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 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 82 [2021-11-19 15:48:52,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:52,836 INFO L225 Difference]: With dead ends: 179 [2021-11-19 15:48:52,836 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 15:48:52,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2021-11-19 15:48:52,839 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:52,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 251 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:48:52,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 15:48:52,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2021-11-19 15:48:52,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 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) [2021-11-19 15:48:52,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-19 15:48:52,849 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2021-11-19 15:48:52,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:52,849 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-19 15:48:52,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 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) [2021-11-19 15:48:52,850 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-19 15:48:52,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-19 15:48:52,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:52,851 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:52,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:53,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable303 [2021-11-19 15:48:53,066 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:53,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:53,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 14 times [2021-11-19 15:48:53,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:53,066 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641831332] [2021-11-19 15:48:53,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:53,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:53,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:53,331 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:53,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:53,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641831332] [2021-11-19 15:48:53,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641831332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:53,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772046372] [2021-11-19 15:48:53,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:48:53,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:53,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:53,334 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:53,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-19 15:48:53,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-19 15:48:53,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:53,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-19 15:48:53,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:53,697 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:53,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:53,960 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:53,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772046372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:53,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561722395] [2021-11-19 15:48:53,962 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:53,963 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:53,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:53,963 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:53,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:53,970 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:53,971 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:53,973 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:53,976 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:53,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:53,978 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:53,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:53,981 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:53,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:48:53,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:53,998 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:54,001 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:54,005 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:54,007 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:54,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:54,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:54,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:54,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:54,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:54,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,028 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:54,030 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:54,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:54,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:54,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,057 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:54,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:54,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:54,072 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:54,074 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:54,080 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:54,082 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:54,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:54,610 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:54,611 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:54,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2021-11-19 15:48:54,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368341302] [2021-11-19 15:48:54,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:54,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-19 15:48:54,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:54,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-19 15:48:54,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=621, Unknown=0, NotChecked=0, Total=812 [2021-11-19 15:48:54,613 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 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) [2021-11-19 15:48:54,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:54,909 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-11-19 15:48:54,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-19 15:48:54,910 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 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) Word has length 84 [2021-11-19 15:48:54,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:54,911 INFO L225 Difference]: With dead ends: 102 [2021-11-19 15:48:54,911 INFO L226 Difference]: Without dead ends: 100 [2021-11-19 15:48:54,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=500, Invalid=1480, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 15:48:54,912 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 110 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:54,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 123 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:48:54,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-19 15:48:54,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2021-11-19 15:48:54,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 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) [2021-11-19 15:48:54,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-11-19 15:48:54,922 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2021-11-19 15:48:54,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:54,922 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-11-19 15:48:54,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 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) [2021-11-19 15:48:54,923 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-11-19 15:48:54,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-19 15:48:54,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:54,924 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:54,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:55,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable328 [2021-11-19 15:48:55,138 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:55,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:55,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 15 times [2021-11-19 15:48:55,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:55,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482787844] [2021-11-19 15:48:55,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:55,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:55,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:55,588 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:55,588 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:55,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482787844] [2021-11-19 15:48:55,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482787844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:55,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009060128] [2021-11-19 15:48:55,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:48:55,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:55,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:55,594 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:55,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-19 15:48:55,682 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:48:55,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:48:55,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-19 15:48:55,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:56,364 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:56,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:56,673 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:56,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009060128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:56,674 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1524368083] [2021-11-19 15:48:56,675 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:56,675 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:56,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:56,676 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:56,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:56,686 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:56,692 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:56,694 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,696 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:56,696 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:56,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:56,710 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:56,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:48:56,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,728 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:56,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:56,735 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:56,738 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:56,738 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:56,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:56,744 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:56,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,765 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:48:56,770 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:56,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:48:56,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,806 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:56,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:56,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:56,823 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:56,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:56,831 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:56,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:56,835 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:48:57,435 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:48:57,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:48:57,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 50 [2021-11-19 15:48:57,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120461963] [2021-11-19 15:48:57,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:48:57,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-19 15:48:57,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:57,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-19 15:48:57,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=2784, Unknown=0, NotChecked=0, Total=3422 [2021-11-19 15:48:57,438 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 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) [2021-11-19 15:48:58,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:58,143 INFO L93 Difference]: Finished difference Result 260 states and 279 transitions. [2021-11-19 15:48:58,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-19 15:48:58,143 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 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 [2021-11-19 15:48:58,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:58,144 INFO L225 Difference]: With dead ends: 260 [2021-11-19 15:48:58,145 INFO L226 Difference]: Without dead ends: 142 [2021-11-19 15:48:58,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1582, Invalid=6074, Unknown=0, NotChecked=0, Total=7656 [2021-11-19 15:48:58,148 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 163 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:58,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 348 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:48:58,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-19 15:48:58,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2021-11-19 15:48:58,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 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) [2021-11-19 15:48:58,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-11-19 15:48:58,157 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2021-11-19 15:48:58,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:58,157 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-11-19 15:48:58,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 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) [2021-11-19 15:48:58,158 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-11-19 15:48:58,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-19 15:48:58,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:58,159 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:58,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:58,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable353 [2021-11-19 15:48:58,367 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:58,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:58,367 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 16 times [2021-11-19 15:48:58,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:58,367 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561014853] [2021-11-19 15:48:58,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:58,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:58,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:58,679 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:58,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:58,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561014853] [2021-11-19 15:48:58,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561014853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:58,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753068423] [2021-11-19 15:48:58,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:48:58,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:58,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:58,685 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:58,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-19 15:48:58,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:58,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-19 15:48:58,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:59,054 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:59,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:59,323 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:48:59,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753068423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:48:59,324 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1912471651] [2021-11-19 15:48:59,326 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:48:59,326 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:48:59,327 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:48:59,327 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:48:59,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:48:59,339 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:48:59,341 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:48:59,344 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,347 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:59,348 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:48:59,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:48:59,353 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:48:59,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:48:59,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,384 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:48:59,387 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:48:59,391 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:48:59,393 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:48:59,394 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,401 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:48:59,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:48:59,406 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:48:59,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:48:59,446 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:48:59,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:48:59,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,481 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:48:59,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:48:59,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:48:59,500 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:59,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:59,509 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:48:59,512 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:48:59,514 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:00,012 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:00,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:00,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2021-11-19 15:49:00,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818263155] [2021-11-19 15:49:00,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:00,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-19 15:49:00,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:00,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-19 15:49:00,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2021-11-19 15:49:00,014 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 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) [2021-11-19 15:49:00,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:00,351 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-11-19 15:49:00,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-19 15:49:00,352 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 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 96 [2021-11-19 15:49:00,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:00,353 INFO L225 Difference]: With dead ends: 114 [2021-11-19 15:49:00,353 INFO L226 Difference]: Without dead ends: 112 [2021-11-19 15:49:00,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=609, Invalid=1743, Unknown=0, NotChecked=0, Total=2352 [2021-11-19 15:49:00,355 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 112 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:00,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 134 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:49:00,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-19 15:49:00,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2021-11-19 15:49:00,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 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) [2021-11-19 15:49:00,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-11-19 15:49:00,366 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2021-11-19 15:49:00,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:00,367 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-11-19 15:49:00,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 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) [2021-11-19 15:49:00,367 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-11-19 15:49:00,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-19 15:49:00,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:00,369 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:00,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:00,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable378 [2021-11-19 15:49:00,594 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:00,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:00,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 17 times [2021-11-19 15:49:00,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:00,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591992816] [2021-11-19 15:49:00,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:00,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:00,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:01,140 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:01,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:01,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591992816] [2021-11-19 15:49:01,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591992816] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:01,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868543235] [2021-11-19 15:49:01,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:49:01,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:01,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:01,143 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:01,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-19 15:49:01,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-19 15:49:01,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:01,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-19 15:49:01,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:02,362 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:02,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:02,709 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:02,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868543235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:02,710 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453720134] [2021-11-19 15:49:02,711 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:02,712 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:02,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:02,712 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:02,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:02,719 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:02,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:02,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,728 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:02,728 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:02,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:02,735 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:02,738 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:02,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,753 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:02,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:02,761 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:02,762 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:02,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:02,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:02,770 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,772 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:02,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:02,793 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:02,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:02,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,824 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:02,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:02,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:02,850 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:02,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:02,859 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:02,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:02,863 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:03,594 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:03,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:03,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 56 [2021-11-19 15:49:03,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813142550] [2021-11-19 15:49:03,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:03,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-19 15:49:03,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:03,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-19 15:49:03,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2021-11-19 15:49:03,597 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 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) [2021-11-19 15:49:04,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:04,532 INFO L93 Difference]: Finished difference Result 294 states and 315 transitions. [2021-11-19 15:49:04,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-19 15:49:04,532 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 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 104 [2021-11-19 15:49:04,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:04,535 INFO L225 Difference]: With dead ends: 294 [2021-11-19 15:49:04,535 INFO L226 Difference]: Without dead ends: 160 [2021-11-19 15:49:04,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2614 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1992, Invalid=7514, Unknown=0, NotChecked=0, Total=9506 [2021-11-19 15:49:04,539 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 194 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:04,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 437 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:04,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-19 15:49:04,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2021-11-19 15:49:04,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 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) [2021-11-19 15:49:04,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-11-19 15:49:04,559 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-11-19 15:49:04,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:04,559 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-11-19 15:49:04,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 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) [2021-11-19 15:49:04,560 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-11-19 15:49:04,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-19 15:49:04,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:04,561 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:04,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:04,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable403,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:04,766 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:04,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:04,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 18 times [2021-11-19 15:49:04,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:04,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299580056] [2021-11-19 15:49:04,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:04,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:04,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:05,084 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:05,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:05,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299580056] [2021-11-19 15:49:05,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299580056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:05,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837981888] [2021-11-19 15:49:05,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:49:05,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:05,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:05,090 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:05,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-19 15:49:05,194 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:49:05,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:05,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-19 15:49:05,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:05,533 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:05,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:05,847 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:05,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837981888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:05,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068685664] [2021-11-19 15:49:05,849 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:05,849 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:05,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:05,850 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:05,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:05,865 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:05,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:05,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,870 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:05,871 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:05,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:05,875 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:05,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:05,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,906 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:05,909 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:05,913 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:05,915 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:05,916 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:05,918 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:05,921 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,924 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:05,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,939 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:05,944 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:05,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:05,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,970 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:05,972 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:05,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:05,986 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:05,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:05,996 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:05,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:05,999 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:06,456 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:06,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:06,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2021-11-19 15:49:06,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973920586] [2021-11-19 15:49:06,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:06,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 15:49:06,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:06,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 15:49:06,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=791, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 15:49:06,458 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 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) [2021-11-19 15:49:06,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:06,785 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2021-11-19 15:49:06,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-19 15:49:06,785 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 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) Word has length 108 [2021-11-19 15:49:06,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:06,786 INFO L225 Difference]: With dead ends: 126 [2021-11-19 15:49:06,786 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 15:49:06,786 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 326 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=730, Invalid=2026, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 15:49:06,787 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:06,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 159 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:49:06,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 15:49:06,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2021-11-19 15:49:06,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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) [2021-11-19 15:49:06,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-11-19 15:49:06,797 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2021-11-19 15:49:06,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:06,798 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-11-19 15:49:06,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 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) [2021-11-19 15:49:06,798 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-11-19 15:49:06,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-19 15:49:06,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:06,799 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:06,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:06,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable428,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:06,999 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:07,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:07,000 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 19 times [2021-11-19 15:49:07,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:07,000 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478409595] [2021-11-19 15:49:07,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:07,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:07,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:07,714 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:07,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:07,715 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478409595] [2021-11-19 15:49:07,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478409595] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:07,715 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676043286] [2021-11-19 15:49:07,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:49:07,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:07,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:07,718 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:07,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-19 15:49:07,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:07,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-19 15:49:07,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:09,059 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:09,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:09,359 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:09,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676043286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:09,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [288789823] [2021-11-19 15:49:09,365 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:09,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:09,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:09,367 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:09,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:09,373 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:09,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:09,377 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,381 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:09,381 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:09,384 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:09,386 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:09,389 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:49:09,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,406 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:09,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:09,413 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:09,414 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:09,415 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,416 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:09,417 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:09,420 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:09,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,435 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:09,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:09,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:09,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,460 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:09,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:09,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:09,475 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:09,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:09,482 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:09,485 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:09,486 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:10,057 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:10,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:10,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2021-11-19 15:49:10,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106078604] [2021-11-19 15:49:10,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:10,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-19 15:49:10,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:10,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-19 15:49:10,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2021-11-19 15:49:10,059 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 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) [2021-11-19 15:49:10,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:10,775 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2021-11-19 15:49:10,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-19 15:49:10,775 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 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 116 [2021-11-19 15:49:10,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:10,777 INFO L225 Difference]: With dead ends: 250 [2021-11-19 15:49:10,777 INFO L226 Difference]: Without dead ends: 173 [2021-11-19 15:49:10,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2021-11-19 15:49:10,779 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 163 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:10,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 412 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:10,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-19 15:49:10,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2021-11-19 15:49:10,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 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) [2021-11-19 15:49:10,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-11-19 15:49:10,791 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2021-11-19 15:49:10,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:10,791 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-11-19 15:49:10,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 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) [2021-11-19 15:49:10,792 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-11-19 15:49:10,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-19 15:49:10,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:10,794 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:10,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:11,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable453 [2021-11-19 15:49:11,022 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:11,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:11,022 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 20 times [2021-11-19 15:49:11,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:11,022 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574044384] [2021-11-19 15:49:11,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:11,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:11,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:11,774 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:11,774 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:11,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574044384] [2021-11-19 15:49:11,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574044384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:11,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809677117] [2021-11-19 15:49:11,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:49:11,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:11,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:11,776 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:11,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-19 15:49:11,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-19 15:49:11,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:11,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-19 15:49:11,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:13,081 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:13,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:13,473 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:13,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809677117] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:13,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1526864402] [2021-11-19 15:49:13,476 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:13,476 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:13,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:13,477 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:13,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:13,487 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:13,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:13,490 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,492 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:13,493 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:13,495 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:13,498 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:13,501 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:13,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,514 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:13,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:13,522 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:13,523 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:13,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:13,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:13,529 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,532 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:13,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,550 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:13,555 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:13,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:13,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,582 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:13,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:13,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:13,603 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:13,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:13,613 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:13,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:13,617 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:14,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:14,321 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:14,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-19 15:49:14,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505885805] [2021-11-19 15:49:14,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:14,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-19 15:49:14,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:14,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-19 15:49:14,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2021-11-19 15:49:14,323 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 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) [2021-11-19 15:49:15,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:15,053 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2021-11-19 15:49:15,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-19 15:49:15,054 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 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 118 [2021-11-19 15:49:15,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:15,056 INFO L225 Difference]: With dead ends: 257 [2021-11-19 15:49:15,056 INFO L226 Difference]: Without dead ends: 178 [2021-11-19 15:49:15,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2021-11-19 15:49:15,058 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 140 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:15,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 384 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:15,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-19 15:49:15,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2021-11-19 15:49:15,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 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) [2021-11-19 15:49:15,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-11-19 15:49:15,073 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2021-11-19 15:49:15,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:15,074 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-11-19 15:49:15,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 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) [2021-11-19 15:49:15,075 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-11-19 15:49:15,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-19 15:49:15,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:15,076 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:15,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:15,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable478 [2021-11-19 15:49:15,290 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:15,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:15,290 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 21 times [2021-11-19 15:49:15,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:15,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452962999] [2021-11-19 15:49:15,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:15,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:15,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:15,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:15,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:15,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452962999] [2021-11-19 15:49:15,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452962999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:15,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135954068] [2021-11-19 15:49:15,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:49:15,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:15,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:15,662 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:15,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-19 15:49:15,775 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:49:15,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:15,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-19 15:49:15,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:16,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:16,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:16,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135954068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:16,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1070135514] [2021-11-19 15:49:16,447 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:16,448 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:16,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:16,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:16,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:16,454 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:16,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:16,457 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,473 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:16,474 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,476 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:16,477 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:16,484 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:16,491 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:16,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,505 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:16,508 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:16,512 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:16,514 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:16,514 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,516 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:16,517 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:16,519 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,521 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:16,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,537 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:16,543 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:16,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:16,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,568 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:16,570 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:16,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:16,583 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:16,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:16,592 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:16,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:16,596 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:17,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:17,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:17,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2021-11-19 15:49:17,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876023523] [2021-11-19 15:49:17,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:17,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 15:49:17,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:17,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 15:49:17,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2021-11-19 15:49:17,191 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 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) [2021-11-19 15:49:17,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:17,646 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2021-11-19 15:49:17,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-19 15:49:17,647 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 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 120 [2021-11-19 15:49:17,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:17,648 INFO L225 Difference]: With dead ends: 138 [2021-11-19 15:49:17,648 INFO L226 Difference]: Without dead ends: 136 [2021-11-19 15:49:17,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 919 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=863, Invalid=2329, Unknown=0, NotChecked=0, Total=3192 [2021-11-19 15:49:17,649 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 96 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:17,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 194 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:49:17,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-19 15:49:17,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-11-19 15:49:17,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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) [2021-11-19 15:49:17,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-11-19 15:49:17,661 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2021-11-19 15:49:17,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:17,662 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-11-19 15:49:17,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 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) [2021-11-19 15:49:17,662 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-11-19 15:49:17,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-19 15:49:17,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:17,664 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:17,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:17,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable503,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:17,874 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:17,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:17,874 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 22 times [2021-11-19 15:49:17,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:17,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349673849] [2021-11-19 15:49:17,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:17,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:17,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:18,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:18,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:18,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349673849] [2021-11-19 15:49:18,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349673849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:18,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139611541] [2021-11-19 15:49:18,508 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:49:18,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:18,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:18,510 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:18,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-19 15:49:18,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:18,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-19 15:49:18,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:19,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:19,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:19,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:19,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139611541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:19,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1352058513] [2021-11-19 15:49:19,985 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:19,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:19,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:19,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:19,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:19,995 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:19,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:19,998 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,005 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:20,005 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:20,007 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:20,009 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:20,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:49:20,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,038 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:20,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:20,044 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:20,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:20,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:20,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:20,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:20,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:20,070 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:20,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:20,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,091 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:20,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:20,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:20,104 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:20,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:20,112 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:20,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:20,116 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:20,700 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:20,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:20,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2021-11-19 15:49:20,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206346603] [2021-11-19 15:49:20,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:20,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-19 15:49:20,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:20,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-19 15:49:20,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2021-11-19 15:49:20,702 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 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) [2021-11-19 15:49:21,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:21,372 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2021-11-19 15:49:21,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-19 15:49:21,372 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 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 128 [2021-11-19 15:49:21,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:21,374 INFO L225 Difference]: With dead ends: 276 [2021-11-19 15:49:21,375 INFO L226 Difference]: Without dead ends: 191 [2021-11-19 15:49:21,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2325 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2021-11-19 15:49:21,376 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 188 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:21,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 369 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:21,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-19 15:49:21,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2021-11-19 15:49:21,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 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) [2021-11-19 15:49:21,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-11-19 15:49:21,389 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2021-11-19 15:49:21,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:21,390 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-11-19 15:49:21,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 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) [2021-11-19 15:49:21,390 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-11-19 15:49:21,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-19 15:49:21,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:21,392 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:21,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:21,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable528,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:21,606 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:21,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:21,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 23 times [2021-11-19 15:49:21,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:21,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721659992] [2021-11-19 15:49:21,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:21,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:21,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:22,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:22,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:22,314 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721659992] [2021-11-19 15:49:22,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721659992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:22,314 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788945450] [2021-11-19 15:49:22,314 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:49:22,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:22,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:22,315 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:22,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-19 15:49:22,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-19 15:49:22,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:22,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-19 15:49:22,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:23,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:23,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:24,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:24,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788945450] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:24,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041265078] [2021-11-19 15:49:24,153 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:24,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:24,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:24,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:24,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:24,162 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:24,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:24,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,166 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:24,166 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:24,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:24,170 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:24,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:49:24,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,183 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:24,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:24,189 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:24,200 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:24,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,203 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:24,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:24,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,209 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:24,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,222 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,225 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:24,227 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:24,229 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:24,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,248 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:24,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:24,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:24,263 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:24,265 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:24,271 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:24,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:24,276 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:24,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:24,940 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:24,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2021-11-19 15:49:24,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148661196] [2021-11-19 15:49:24,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:24,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-19 15:49:24,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:24,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-19 15:49:24,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2021-11-19 15:49:24,944 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 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) [2021-11-19 15:49:25,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:25,639 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2021-11-19 15:49:25,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-19 15:49:25,640 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 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 130 [2021-11-19 15:49:25,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:25,641 INFO L225 Difference]: With dead ends: 283 [2021-11-19 15:49:25,641 INFO L226 Difference]: Without dead ends: 196 [2021-11-19 15:49:25,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2021-11-19 15:49:25,643 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 178 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:25,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 442 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:25,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-19 15:49:25,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2021-11-19 15:49:25,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 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) [2021-11-19 15:49:25,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-11-19 15:49:25,656 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2021-11-19 15:49:25,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:25,656 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-11-19 15:49:25,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 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) [2021-11-19 15:49:25,657 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-11-19 15:49:25,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-19 15:49:25,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:25,658 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:25,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:25,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable553 [2021-11-19 15:49:25,876 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:25,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:25,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 24 times [2021-11-19 15:49:25,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:25,877 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988935733] [2021-11-19 15:49:25,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:25,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:25,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:26,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:26,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:26,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988935733] [2021-11-19 15:49:26,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988935733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:26,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493704849] [2021-11-19 15:49:26,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:49:26,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:26,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:26,339 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:26,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-19 15:49:26,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:49:26,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:26,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-19 15:49:26,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:26,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:26,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:27,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:27,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493704849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:27,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480426549] [2021-11-19 15:49:27,230 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:27,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:27,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:27,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:27,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:27,240 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:27,241 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:27,244 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,246 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:27,247 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:27,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:27,252 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:27,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:49:27,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,268 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:27,271 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:27,275 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:27,276 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:27,277 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:27,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:27,281 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:27,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:27,303 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:27,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:27,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,327 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:27,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:27,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:27,342 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:27,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:27,350 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:27,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:27,354 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:27,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:27,869 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:27,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2021-11-19 15:49:27,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029013383] [2021-11-19 15:49:27,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:27,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-19 15:49:27,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:27,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-19 15:49:27,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 15:49:27,875 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 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) [2021-11-19 15:49:28,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:28,287 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2021-11-19 15:49:28,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-19 15:49:28,288 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 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 132 [2021-11-19 15:49:28,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:28,289 INFO L225 Difference]: With dead ends: 150 [2021-11-19 15:49:28,289 INFO L226 Difference]: Without dead ends: 148 [2021-11-19 15:49:28,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1008, Invalid=2652, Unknown=0, NotChecked=0, Total=3660 [2021-11-19 15:49:28,290 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 171 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:28,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 191 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:49:28,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-19 15:49:28,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2021-11-19 15:49:28,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 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) [2021-11-19 15:49:28,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-11-19 15:49:28,306 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2021-11-19 15:49:28,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:28,307 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-11-19 15:49:28,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 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) [2021-11-19 15:49:28,307 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-11-19 15:49:28,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-19 15:49:28,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:28,309 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:28,341 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-19 15:49:28,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable578 [2021-11-19 15:49:28,522 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:28,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:28,522 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 25 times [2021-11-19 15:49:28,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:28,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137814986] [2021-11-19 15:49:28,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:28,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:28,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:29,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:29,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:29,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137814986] [2021-11-19 15:49:29,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137814986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:29,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020838404] [2021-11-19 15:49:29,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:49:29,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:29,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:29,262 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:29,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-19 15:49:29,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:29,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-19 15:49:29,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:30,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:30,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:30,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:30,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020838404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:30,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059963828] [2021-11-19 15:49:30,784 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:30,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:30,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:30,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:30,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:30,813 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:30,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:30,817 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,819 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:30,819 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,821 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:30,822 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:30,824 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:30,827 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:49:30,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,839 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:30,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:30,845 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:30,846 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:30,848 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,850 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:30,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:30,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:30,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,865 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:30,869 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:30,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:30,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,883 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,891 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:30,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:30,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:30,906 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:30,908 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:30,914 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:30,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:30,918 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:31,580 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:31,580 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:31,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2021-11-19 15:49:31,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468861130] [2021-11-19 15:49:31,581 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:31,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-19 15:49:31,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:31,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-19 15:49:31,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2021-11-19 15:49:31,584 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 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) [2021-11-19 15:49:32,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:32,346 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2021-11-19 15:49:32,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-19 15:49:32,346 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 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 140 [2021-11-19 15:49:32,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:32,348 INFO L225 Difference]: With dead ends: 302 [2021-11-19 15:49:32,348 INFO L226 Difference]: Without dead ends: 209 [2021-11-19 15:49:32,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2021-11-19 15:49:32,350 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 178 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:32,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 414 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:49:32,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-19 15:49:32,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2021-11-19 15:49:32,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 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) [2021-11-19 15:49:32,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-11-19 15:49:32,373 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2021-11-19 15:49:32,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:32,374 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-11-19 15:49:32,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 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) [2021-11-19 15:49:32,374 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-11-19 15:49:32,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-19 15:49:32,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:32,375 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:32,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:32,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable603 [2021-11-19 15:49:32,590 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:32,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:32,590 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 26 times [2021-11-19 15:49:32,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:32,590 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225104346] [2021-11-19 15:49:32,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:32,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:32,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:33,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:33,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:33,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225104346] [2021-11-19 15:49:33,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225104346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:33,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684767572] [2021-11-19 15:49:33,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:49:33,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:33,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:33,459 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:33,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-19 15:49:33,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-19 15:49:33,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:33,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-19 15:49:33,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:35,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:35,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:35,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:35,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684767572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:35,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312340706] [2021-11-19 15:49:35,375 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:35,376 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:35,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:35,376 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:35,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:35,382 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:35,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:35,385 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,399 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:35,400 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:35,403 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:35,406 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:35,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:49:35,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,424 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:35,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:35,431 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:35,433 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:35,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,435 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:35,436 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:35,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:35,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:35,460 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:35,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:35,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,482 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:35,484 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:35,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:35,495 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:35,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:35,502 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:35,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:35,506 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:36,122 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:36,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:36,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2021-11-19 15:49:36,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629070908] [2021-11-19 15:49:36,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:36,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-19 15:49:36,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:36,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-19 15:49:36,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2021-11-19 15:49:36,125 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 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) [2021-11-19 15:49:37,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:37,003 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2021-11-19 15:49:37,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-19 15:49:37,003 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 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 142 [2021-11-19 15:49:37,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:37,005 INFO L225 Difference]: With dead ends: 309 [2021-11-19 15:49:37,005 INFO L226 Difference]: Without dead ends: 214 [2021-11-19 15:49:37,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2835 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2021-11-19 15:49:37,007 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 210 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:37,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 471 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:49:37,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-19 15:49:37,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2021-11-19 15:49:37,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 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) [2021-11-19 15:49:37,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-11-19 15:49:37,025 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2021-11-19 15:49:37,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:37,026 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-11-19 15:49:37,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 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) [2021-11-19 15:49:37,026 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-11-19 15:49:37,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:49:37,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:37,028 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:37,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:37,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable628,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:37,246 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:37,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:37,246 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 27 times [2021-11-19 15:49:37,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:37,246 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727558233] [2021-11-19 15:49:37,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:37,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:37,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:37,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:37,769 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:37,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727558233] [2021-11-19 15:49:37,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727558233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:37,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10586862] [2021-11-19 15:49:37,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:49:37,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:37,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:37,770 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:37,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-19 15:49:37,896 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:49:37,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:37,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-19 15:49:37,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:38,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:38,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:38,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10586862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:38,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901159470] [2021-11-19 15:49:38,708 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:38,708 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:38,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:38,708 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:38,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:38,714 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:38,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:38,718 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,720 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:38,720 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:38,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:38,725 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:38,728 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:49:38,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,737 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:38,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:38,742 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:38,746 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:38,747 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:38,750 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:38,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:49:38,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,764 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,766 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:38,768 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:38,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:38,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,792 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:38,794 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:38,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:38,807 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:38,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:38,815 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:38,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:38,820 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:39,309 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:39,309 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:39,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2021-11-19 15:49:39,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848103670] [2021-11-19 15:49:39,310 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:39,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-19 15:49:39,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:39,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-19 15:49:39,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=1076, Unknown=0, NotChecked=0, Total=1482 [2021-11-19 15:49:39,311 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 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) [2021-11-19 15:49:39,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:39,778 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2021-11-19 15:49:39,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-19 15:49:39,779 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 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 144 [2021-11-19 15:49:39,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:39,780 INFO L225 Difference]: With dead ends: 162 [2021-11-19 15:49:39,780 INFO L226 Difference]: Without dead ends: 160 [2021-11-19 15:49:39,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1165, Invalid=2995, Unknown=0, NotChecked=0, Total=4160 [2021-11-19 15:49:39,781 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 132 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:39,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 224 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:49:39,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-19 15:49:39,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2021-11-19 15:49:39,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 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) [2021-11-19 15:49:39,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-11-19 15:49:39,796 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2021-11-19 15:49:39,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:39,796 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-11-19 15:49:39,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 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) [2021-11-19 15:49:39,797 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-11-19 15:49:39,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-19 15:49:39,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:39,798 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:39,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:40,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable653 [2021-11-19 15:49:40,026 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:40,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:40,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 28 times [2021-11-19 15:49:40,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:40,026 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136795487] [2021-11-19 15:49:40,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:40,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:40,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:41,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:41,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:41,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136795487] [2021-11-19 15:49:41,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136795487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:41,068 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416780991] [2021-11-19 15:49:41,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:49:41,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:41,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:41,070 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:41,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-19 15:49:41,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:41,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-19 15:49:41,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:42,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:42,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:43,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:43,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416780991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:43,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474528276] [2021-11-19 15:49:43,016 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:43,016 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:43,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:43,016 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:43,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:43,023 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:43,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:43,027 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,029 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:43,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,032 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:43,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:43,036 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:43,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:43,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,052 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:43,055 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:43,059 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:43,060 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:43,061 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:43,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:43,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:43,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,084 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:43,087 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:43,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:43,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,106 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:43,109 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:43,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:43,120 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:43,123 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:43,129 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:43,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:43,133 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:43,894 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:43,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:43,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2021-11-19 15:49:43,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777956159] [2021-11-19 15:49:43,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:43,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-19 15:49:43,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:43,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-19 15:49:43,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2021-11-19 15:49:43,897 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 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) [2021-11-19 15:49:45,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:45,001 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2021-11-19 15:49:45,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-19 15:49:45,002 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 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 152 [2021-11-19 15:49:45,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:45,005 INFO L225 Difference]: With dead ends: 328 [2021-11-19 15:49:45,006 INFO L226 Difference]: Without dead ends: 227 [2021-11-19 15:49:45,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3123 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2021-11-19 15:49:45,007 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 209 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:45,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 575 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:49:45,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-19 15:49:45,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2021-11-19 15:49:45,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 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) [2021-11-19 15:49:45,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-11-19 15:49:45,020 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2021-11-19 15:49:45,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:45,020 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-11-19 15:49:45,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 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) [2021-11-19 15:49:45,021 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-11-19 15:49:45,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-19 15:49:45,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:45,022 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:45,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:45,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable678,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:45,225 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:45,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:45,225 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 29 times [2021-11-19 15:49:45,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:45,225 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696697022] [2021-11-19 15:49:45,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:45,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:45,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:46,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:46,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:46,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696697022] [2021-11-19 15:49:46,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696697022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:46,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026715551] [2021-11-19 15:49:46,240 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:49:46,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:46,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:46,266 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:46,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-19 15:49:46,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-19 15:49:46,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:46,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-19 15:49:46,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:47,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:47,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:48,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:48,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026715551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:48,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503325037] [2021-11-19 15:49:48,323 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:48,323 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:48,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:48,323 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:48,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:48,330 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:48,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:48,360 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,362 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:48,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:48,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:48,370 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:48,373 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:49:48,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,388 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:48,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:48,395 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:48,396 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:48,397 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,398 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:48,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:48,402 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,404 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:48,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,417 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:48,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:48,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:48,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,444 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:48,446 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:48,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:48,458 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:48,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:48,466 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:48,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:48,470 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:49,251 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:49,251 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:49,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2021-11-19 15:49:49,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94402416] [2021-11-19 15:49:49,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:49,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-19 15:49:49,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:49,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-19 15:49:49,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2021-11-19 15:49:49,254 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 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) [2021-11-19 15:49:50,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:50,490 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2021-11-19 15:49:50,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-19 15:49:50,490 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 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 154 [2021-11-19 15:49:50,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:50,491 INFO L225 Difference]: With dead ends: 335 [2021-11-19 15:49:50,492 INFO L226 Difference]: Without dead ends: 232 [2021-11-19 15:49:50,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 426 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3256 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2021-11-19 15:49:50,494 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 204 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:50,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 576 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:49:50,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-19 15:49:50,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2021-11-19 15:49:50,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 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) [2021-11-19 15:49:50,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-11-19 15:49:50,517 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2021-11-19 15:49:50,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:50,517 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-11-19 15:49:50,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 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) [2021-11-19 15:49:50,518 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-11-19 15:49:50,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-19 15:49:50,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:50,519 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:50,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:50,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable703,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:50,746 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:50,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:50,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 30 times [2021-11-19 15:49:50,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:50,746 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352086718] [2021-11-19 15:49:50,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:50,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:50,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:51,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:51,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:51,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352086718] [2021-11-19 15:49:51,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352086718] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:51,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602492077] [2021-11-19 15:49:51,240 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:49:51,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:51,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:51,246 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:51,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-19 15:49:51,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:49:51,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:49:51,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-19 15:49:51,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:51,811 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:51,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:52,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:52,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602492077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:52,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2115981097] [2021-11-19 15:49:52,126 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:52,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:52,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:52,127 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:52,127 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:52,140 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:52,141 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:52,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,144 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:52,145 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:52,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:52,147 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:52,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:52,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,184 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:52,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:52,198 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:52,199 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:52,200 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:52,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:52,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:52,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:49:52,223 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:52,226 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:49:52,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,244 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:52,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:52,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:52,260 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:52,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:52,267 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:52,270 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:52,271 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:52,745 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:52,745 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:52,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2021-11-19 15:49:52,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132096506] [2021-11-19 15:49:52,746 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:52,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 15:49:52,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:52,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 15:49:52,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1179, Unknown=0, NotChecked=0, Total=1640 [2021-11-19 15:49:52,747 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 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) [2021-11-19 15:49:53,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:53,223 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2021-11-19 15:49:53,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-19 15:49:53,223 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 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 156 [2021-11-19 15:49:53,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:53,224 INFO L225 Difference]: With dead ends: 174 [2021-11-19 15:49:53,224 INFO L226 Difference]: Without dead ends: 172 [2021-11-19 15:49:53,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 478 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1334, Invalid=3358, Unknown=0, NotChecked=0, Total=4692 [2021-11-19 15:49:53,225 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 204 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:53,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 216 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:49:53,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-19 15:49:53,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2021-11-19 15:49:53,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 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) [2021-11-19 15:49:53,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-11-19 15:49:53,236 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2021-11-19 15:49:53,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:53,236 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-11-19 15:49:53,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 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) [2021-11-19 15:49:53,237 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-11-19 15:49:53,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-19 15:49:53,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:53,238 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:53,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-19 15:49:53,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable728,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:53,453 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:53,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:53,453 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 31 times [2021-11-19 15:49:53,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:53,454 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873769027] [2021-11-19 15:49:53,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:53,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:53,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:54,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:49:54,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:54,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873769027] [2021-11-19 15:49:54,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873769027] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:54,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365644470] [2021-11-19 15:49:54,713 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:49:54,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:54,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:54,714 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:54,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-19 15:49:54,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:54,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-19 15:49:54,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:56,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:56,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:57,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:49:57,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365644470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:49:57,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [935739374] [2021-11-19 15:49:57,014 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:49:57,014 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:49:57,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:49:57,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:49:57,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:49:57,024 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:49:57,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:57,027 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,038 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:57,038 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:49:57,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:49:57,042 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:49:57,045 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:49:57,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,055 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:49:57,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:49:57,060 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:49:57,061 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:49:57,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:49:57,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:49:57,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,067 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:49:57,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,085 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:49:57,088 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:49:57,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:49:57,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,112 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:49:57,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:49:57,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:49:57,126 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:57,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:57,132 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:49:57,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:49:57,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:49:57,823 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:49:57,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:49:57,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2021-11-19 15:49:57,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985551207] [2021-11-19 15:49:57,823 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:49:57,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-19 15:49:57,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:57,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-19 15:49:57,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2021-11-19 15:49:57,825 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 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) [2021-11-19 15:49:58,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:58,893 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2021-11-19 15:49:58,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-19 15:49:58,894 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 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 164 [2021-11-19 15:49:58,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:58,895 INFO L225 Difference]: With dead ends: 354 [2021-11-19 15:49:58,895 INFO L226 Difference]: Without dead ends: 245 [2021-11-19 15:49:58,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3564 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2021-11-19 15:49:58,897 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 226 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:58,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 600 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:49:58,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-19 15:49:58,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2021-11-19 15:49:58,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 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) [2021-11-19 15:49:58,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-11-19 15:49:58,915 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2021-11-19 15:49:58,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:58,916 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-11-19 15:49:58,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 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) [2021-11-19 15:49:58,916 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-11-19 15:49:58,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-19 15:49:58,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:58,917 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:58,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:59,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable753 [2021-11-19 15:49:59,130 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:59,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:59,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 32 times [2021-11-19 15:49:59,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:59,130 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848088981] [2021-11-19 15:49:59,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:59,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:59,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:00,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:00,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:00,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848088981] [2021-11-19 15:50:00,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848088981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:00,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87826199] [2021-11-19 15:50:00,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:50:00,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:00,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:00,309 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:00,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-19 15:50:00,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-19 15:50:00,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:00,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-19 15:50:00,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:01,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:01,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:02,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:02,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87826199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:02,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1298647585] [2021-11-19 15:50:02,314 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:02,314 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:02,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:02,315 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:02,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:02,321 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:02,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:02,324 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,326 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:02,327 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,328 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:02,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:02,331 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:02,333 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:50:02,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,344 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:02,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:02,350 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:02,351 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:02,352 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:02,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:02,356 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:50:02,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,369 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,370 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:50:02,372 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:02,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:50:02,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,391 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:02,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:02,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:02,410 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:02,412 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:02,417 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:02,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:02,420 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:03,055 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:03,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:03,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 29, 29] total 84 [2021-11-19 15:50:03,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242396413] [2021-11-19 15:50:03,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:03,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-19 15:50:03,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:03,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-19 15:50:03,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=7277, Unknown=0, NotChecked=0, Total=8556 [2021-11-19 15:50:03,058 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 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) [2021-11-19 15:50:05,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:05,738 INFO L93 Difference]: Finished difference Result 368 states and 399 transitions. [2021-11-19 15:50:05,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-19 15:50:05,739 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 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 166 [2021-11-19 15:50:05,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:05,740 INFO L225 Difference]: With dead ends: 368 [2021-11-19 15:50:05,740 INFO L226 Difference]: Without dead ends: 257 [2021-11-19 15:50:05,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 487 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13642 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6088, Invalid=34112, Unknown=0, NotChecked=0, Total=40200 [2021-11-19 15:50:05,743 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 418 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 1770 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 2247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 1770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:05,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [418 Valid, 465 Invalid, 2247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [477 Valid, 1770 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:50:05,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-19 15:50:05,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 173. [2021-11-19 15:50:05,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 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) [2021-11-19 15:50:05,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-11-19 15:50:05,760 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2021-11-19 15:50:05,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:05,761 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-11-19 15:50:05,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 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) [2021-11-19 15:50:05,761 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-11-19 15:50:05,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-19 15:50:05,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:05,763 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:05,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:05,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable778,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:05,982 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:05,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:05,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1621508872, now seen corresponding path program 33 times [2021-11-19 15:50:05,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:05,982 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488528872] [2021-11-19 15:50:05,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:05,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:06,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:07,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:07,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:07,030 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488528872] [2021-11-19 15:50:07,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488528872] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:07,031 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568232759] [2021-11-19 15:50:07,031 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:50:07,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:07,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:07,031 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:07,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-19 15:50:07,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:50:07,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:07,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-19 15:50:07,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:08,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:08,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:08,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:08,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568232759] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:08,729 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379955356] [2021-11-19 15:50:08,729 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:08,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:08,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:08,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:08,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:08,740 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:08,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:08,743 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,745 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:08,745 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,746 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:08,747 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:08,748 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:08,750 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:50:08,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,761 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:08,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:08,766 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:08,767 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:08,767 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,768 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:08,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:08,776 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:50:08,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,791 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:50:08,793 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:08,796 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:50:08,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,823 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:08,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:08,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:08,831 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:08,832 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:08,836 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:08,837 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:08,838 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:09,495 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:09,495 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:09,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 30, 30] total 87 [2021-11-19 15:50:09,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498393545] [2021-11-19 15:50:09,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:09,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-19 15:50:09,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:09,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-19 15:50:09,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=7753, Unknown=0, NotChecked=0, Total=9120 [2021-11-19 15:50:09,498 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 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) [2021-11-19 15:50:12,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:12,299 INFO L93 Difference]: Finished difference Result 381 states and 413 transitions. [2021-11-19 15:50:12,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-19 15:50:12,305 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 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 172 [2021-11-19 15:50:12,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:12,306 INFO L225 Difference]: With dead ends: 381 [2021-11-19 15:50:12,307 INFO L226 Difference]: Without dead ends: 266 [2021-11-19 15:50:12,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 505 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14638 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=6522, Invalid=36534, Unknown=0, NotChecked=0, Total=43056 [2021-11-19 15:50:12,309 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 552 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 1730 mSolverCounterSat, 621 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 621 IncrementalHoareTripleChecker+Valid, 1730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:12,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 396 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [621 Valid, 1730 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:50:12,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-19 15:50:12,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 179. [2021-11-19 15:50:12,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 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) [2021-11-19 15:50:12,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-11-19 15:50:12,322 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 172 [2021-11-19 15:50:12,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:12,322 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-11-19 15:50:12,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 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) [2021-11-19 15:50:12,323 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-11-19 15:50:12,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-19 15:50:12,324 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:12,324 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:12,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:12,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable803,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:12,545 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:12,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:12,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 34 times [2021-11-19 15:50:12,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:12,546 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210455011] [2021-11-19 15:50:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:12,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:12,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:13,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:13,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:13,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210455011] [2021-11-19 15:50:13,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210455011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:13,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384525227] [2021-11-19 15:50:13,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:50:13,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:13,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:13,663 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:13,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-19 15:50:13,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:13,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-19 15:50:13,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:15,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:15,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:15,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:15,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384525227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:15,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936600914] [2021-11-19 15:50:15,998 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:15,999 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:15,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:15,999 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:15,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:16,010 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:16,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:16,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,016 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:16,017 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:16,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:16,022 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:16,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:50:16,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,038 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:16,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:16,044 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:16,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:16,046 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:16,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:16,051 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:50:16,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:50:16,071 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:16,073 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:50:16,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,093 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:16,095 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:16,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:16,111 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:16,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:16,118 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:16,120 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:16,122 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:16,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:16,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:16,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2021-11-19 15:50:16,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533327982] [2021-11-19 15:50:16,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:16,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-19 15:50:16,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:16,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-19 15:50:16,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2021-11-19 15:50:16,821 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 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) [2021-11-19 15:50:17,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:17,903 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2021-11-19 15:50:17,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-19 15:50:17,903 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 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 178 [2021-11-19 15:50:17,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:17,905 INFO L225 Difference]: With dead ends: 387 [2021-11-19 15:50:17,905 INFO L226 Difference]: Without dead ends: 268 [2021-11-19 15:50:17,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4182 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2021-11-19 15:50:17,906 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 327 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:17,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 691 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:50:17,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-19 15:50:17,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2021-11-19 15:50:17,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 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) [2021-11-19 15:50:17,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-11-19 15:50:17,925 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2021-11-19 15:50:17,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:17,925 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-11-19 15:50:17,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 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) [2021-11-19 15:50:17,926 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-11-19 15:50:17,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-19 15:50:17,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:17,927 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:17,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:18,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable828,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:18,140 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:18,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:18,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 35 times [2021-11-19 15:50:18,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:18,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907420800] [2021-11-19 15:50:18,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:18,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:18,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:18,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:18,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:18,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907420800] [2021-11-19 15:50:18,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907420800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:18,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850556146] [2021-11-19 15:50:18,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:50:18,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:18,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:18,663 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:18,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-19 15:50:18,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-19 15:50:18,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:18,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-19 15:50:18,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:19,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:19,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:19,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:19,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850556146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:19,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [693577955] [2021-11-19 15:50:19,590 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:19,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:19,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:19,590 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:19,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:19,595 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:19,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:19,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,600 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:19,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,602 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:19,603 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:19,607 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:19,610 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:50:19,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,620 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:19,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:19,626 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:19,627 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:19,628 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,629 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:19,630 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:19,632 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,633 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:50:19,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,645 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,646 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:19,648 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:19,650 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:19,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,665 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:19,666 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:19,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:19,674 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:19,675 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:19,680 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:19,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:19,683 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:20,093 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:20,093 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:20,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2021-11-19 15:50:20,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066451777] [2021-11-19 15:50:20,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:20,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-19 15:50:20,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:20,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-19 15:50:20,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=583, Invalid=1397, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 15:50:20,095 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 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) [2021-11-19 15:50:20,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:20,631 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2021-11-19 15:50:20,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-19 15:50:20,632 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 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 180 [2021-11-19 15:50:20,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:20,633 INFO L225 Difference]: With dead ends: 198 [2021-11-19 15:50:20,633 INFO L226 Difference]: Without dead ends: 196 [2021-11-19 15:50:20,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1708, Invalid=4144, Unknown=0, NotChecked=0, Total=5852 [2021-11-19 15:50:20,634 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 166 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:20,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 296 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:50:20,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-19 15:50:20,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2021-11-19 15:50:20,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 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) [2021-11-19 15:50:20,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-11-19 15:50:20,668 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2021-11-19 15:50:20,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:20,669 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-11-19 15:50:20,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 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) [2021-11-19 15:50:20,669 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-11-19 15:50:20,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-19 15:50:20,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:20,670 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:20,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:20,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable853 [2021-11-19 15:50:20,870 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:20,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:20,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 36 times [2021-11-19 15:50:20,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:20,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529098397] [2021-11-19 15:50:20,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:20,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:20,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:22,029 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:22,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529098397] [2021-11-19 15:50:22,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529098397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:22,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841363659] [2021-11-19 15:50:22,029 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:50:22,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:22,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:22,044 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:22,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-19 15:50:22,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:50:22,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:22,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-19 15:50:22,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:24,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:24,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:24,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:24,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841363659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:24,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553297634] [2021-11-19 15:50:24,523 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:24,523 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:24,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:24,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:24,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:24,527 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:24,529 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:24,530 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,541 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:24,541 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,542 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:24,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:24,544 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:24,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:50:24,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,564 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:24,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:24,569 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:24,570 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:24,571 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:24,573 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:24,575 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:24,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,587 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,589 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:24,591 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:24,593 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:24,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,609 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:24,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:24,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:24,621 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:24,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:24,628 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:24,629 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:24,631 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:25,374 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:25,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:25,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 98 [2021-11-19 15:50:25,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580428968] [2021-11-19 15:50:25,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:25,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-19 15:50:25,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:25,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-19 15:50:25,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2270, Invalid=9072, Unknown=0, NotChecked=0, Total=11342 [2021-11-19 15:50:25,377 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 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) [2021-11-19 15:50:27,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:27,360 INFO L93 Difference]: Finished difference Result 532 states and 567 transitions. [2021-11-19 15:50:27,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-19 15:50:27,361 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 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 188 [2021-11-19 15:50:27,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:27,362 INFO L225 Difference]: With dead ends: 532 [2021-11-19 15:50:27,362 INFO L226 Difference]: Without dead ends: 286 [2021-11-19 15:50:27,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 520 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7374 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6206, Invalid=21850, Unknown=0, NotChecked=0, Total=28056 [2021-11-19 15:50:27,365 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 395 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 395 SdHoareTripleChecker+Valid, 877 SdHoareTripleChecker+Invalid, 1254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:27,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [395 Valid, 877 Invalid, 1254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:50:27,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-19 15:50:27,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2021-11-19 15:50:27,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 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) [2021-11-19 15:50:27,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-11-19 15:50:27,389 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-11-19 15:50:27,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:27,389 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-11-19 15:50:27,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 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) [2021-11-19 15:50:27,390 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-11-19 15:50:27,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-19 15:50:27,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:27,391 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:27,432 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-19 15:50:27,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable878 [2021-11-19 15:50:27,618 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:27,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:27,618 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 37 times [2021-11-19 15:50:27,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:27,618 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413334163] [2021-11-19 15:50:27,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:27,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:27,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:28,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:28,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:28,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413334163] [2021-11-19 15:50:28,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413334163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:28,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190808432] [2021-11-19 15:50:28,231 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:50:28,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:28,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:28,231 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:28,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-19 15:50:28,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:28,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-19 15:50:28,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:28,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:28,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:29,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190808432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:29,087 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [599667721] [2021-11-19 15:50:29,087 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:29,087 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:29,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:29,088 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:29,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:29,099 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:29,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:29,101 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,103 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:29,103 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:29,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:29,106 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:29,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:50:29,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,115 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:29,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:29,120 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:29,120 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:29,121 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:29,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:29,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,127 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:29,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:29,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:29,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:29,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,157 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:29,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:29,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:29,165 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:29,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:29,170 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:29,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:29,173 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:29,634 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:29,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:29,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2021-11-19 15:50:29,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582731068] [2021-11-19 15:50:29,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:29,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-19 15:50:29,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:29,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-19 15:50:29,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=650, Invalid=1512, Unknown=0, NotChecked=0, Total=2162 [2021-11-19 15:50:29,636 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 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) [2021-11-19 15:50:30,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:30,199 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2021-11-19 15:50:30,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-19 15:50:30,199 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 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 192 [2021-11-19 15:50:30,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:30,200 INFO L225 Difference]: With dead ends: 210 [2021-11-19 15:50:30,200 INFO L226 Difference]: Without dead ends: 208 [2021-11-19 15:50:30,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 592 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1913, Invalid=4567, Unknown=0, NotChecked=0, Total=6480 [2021-11-19 15:50:30,201 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 212 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:30,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 244 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:50:30,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-19 15:50:30,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2021-11-19 15:50:30,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 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) [2021-11-19 15:50:30,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-11-19 15:50:30,218 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2021-11-19 15:50:30,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:30,218 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-11-19 15:50:30,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 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) [2021-11-19 15:50:30,218 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-11-19 15:50:30,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-19 15:50:30,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:30,219 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:30,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:30,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable903 [2021-11-19 15:50:30,420 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:30,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:30,420 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 38 times [2021-11-19 15:50:30,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:30,421 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077420653] [2021-11-19 15:50:30,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:30,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:30,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:31,721 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:31,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:31,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077420653] [2021-11-19 15:50:31,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2077420653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:31,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999110816] [2021-11-19 15:50:31,722 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:50:31,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:31,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:31,723 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:31,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-19 15:50:31,879 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-19 15:50:31,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:31,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-19 15:50:31,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:33,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:33,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:34,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:34,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999110816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:34,365 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391321649] [2021-11-19 15:50:34,366 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:34,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:34,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:34,366 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:34,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:34,370 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:34,371 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:34,373 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,374 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:34,374 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:34,376 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:34,380 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:34,382 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:50:34,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,392 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:34,394 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:34,397 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:34,398 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:34,398 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:34,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:34,401 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:34,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,410 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,411 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:34,412 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:34,414 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:34,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,427 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:34,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:34,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:34,435 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:34,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:34,440 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:34,442 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:34,443 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:35,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:35,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:35,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 104 [2021-11-19 15:50:35,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032307108] [2021-11-19 15:50:35,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:35,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-19 15:50:35,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:35,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-19 15:50:35,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=10110, Unknown=0, NotChecked=0, Total=12656 [2021-11-19 15:50:35,205 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 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) [2021-11-19 15:50:37,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:37,199 INFO L93 Difference]: Finished difference Result 566 states and 603 transitions. [2021-11-19 15:50:37,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-19 15:50:37,199 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 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 200 [2021-11-19 15:50:37,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:37,201 INFO L225 Difference]: With dead ends: 566 [2021-11-19 15:50:37,201 INFO L226 Difference]: Without dead ends: 304 [2021-11-19 15:50:37,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 554 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8246 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=7000, Invalid=24506, Unknown=0, NotChecked=0, Total=31506 [2021-11-19 15:50:37,204 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 485 mSDsluCounter, 775 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 841 SdHoareTripleChecker+Invalid, 1276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:37,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 841 Invalid, 1276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:50:37,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-19 15:50:37,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2021-11-19 15:50:37,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 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) [2021-11-19 15:50:37,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-11-19 15:50:37,228 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2021-11-19 15:50:37,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:37,228 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-11-19 15:50:37,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 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) [2021-11-19 15:50:37,228 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-11-19 15:50:37,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-19 15:50:37,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:37,230 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:37,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:37,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable928,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:37,453 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:37,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:37,454 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 39 times [2021-11-19 15:50:37,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:37,454 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324206567] [2021-11-19 15:50:37,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:37,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:37,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:38,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:38,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:38,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324206567] [2021-11-19 15:50:38,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324206567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:38,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470399091] [2021-11-19 15:50:38,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:50:38,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:38,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:38,005 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:38,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-19 15:50:38,107 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:50:38,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:38,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-19 15:50:38,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:38,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:38,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:39,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:39,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470399091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:39,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948942645] [2021-11-19 15:50:39,035 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:39,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:39,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:39,035 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:39,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:39,040 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:39,041 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:39,043 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,044 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:39,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:39,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:39,048 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:39,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:50:39,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,058 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:39,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:39,063 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:39,064 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:39,064 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:39,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:39,073 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:39,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:39,094 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:39,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:39,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,112 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:39,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:39,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:39,124 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:39,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:39,131 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:39,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:39,135 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:39,587 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:39,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:39,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2021-11-19 15:50:39,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655310952] [2021-11-19 15:50:39,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:39,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-19 15:50:39,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:39,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-19 15:50:39,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=721, Invalid=1631, Unknown=0, NotChecked=0, Total=2352 [2021-11-19 15:50:39,588 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 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) [2021-11-19 15:50:40,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:40,247 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2021-11-19 15:50:40,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-19 15:50:40,247 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 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 204 [2021-11-19 15:50:40,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:40,249 INFO L225 Difference]: With dead ends: 222 [2021-11-19 15:50:40,249 INFO L226 Difference]: Without dead ends: 220 [2021-11-19 15:50:40,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 630 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2130, Invalid=5010, Unknown=0, NotChecked=0, Total=7140 [2021-11-19 15:50:40,250 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 186 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:40,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 319 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:50:40,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-19 15:50:40,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2021-11-19 15:50:40,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 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) [2021-11-19 15:50:40,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2021-11-19 15:50:40,270 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2021-11-19 15:50:40,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:40,270 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2021-11-19 15:50:40,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 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) [2021-11-19 15:50:40,270 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2021-11-19 15:50:40,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-19 15:50:40,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:40,271 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:40,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:40,472 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable953 [2021-11-19 15:50:40,472 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:40,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:40,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 40 times [2021-11-19 15:50:40,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:40,473 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493250274] [2021-11-19 15:50:40,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:40,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:40,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:42,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:42,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:42,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493250274] [2021-11-19 15:50:42,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493250274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:42,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878205825] [2021-11-19 15:50:42,016 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:50:42,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:42,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:42,016 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:42,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-19 15:50:42,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:42,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-19 15:50:42,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:44,594 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:50:44,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:45,002 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:50:45,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878205825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:45,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019878781] [2021-11-19 15:50:45,004 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:45,004 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:45,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:45,004 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:45,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:45,026 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:45,027 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:45,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,032 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:45,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,034 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:45,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:45,037 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:45,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:50:45,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,053 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:45,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:45,060 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:45,061 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:45,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:45,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:45,066 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,068 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:50:45,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,081 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,083 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:50:45,086 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:45,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:50:45,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,106 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:45,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:45,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:45,119 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:45,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:45,126 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:45,128 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:45,130 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:46,006 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:46,006 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:46,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2021-11-19 15:50:46,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134511397] [2021-11-19 15:50:46,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:46,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-19 15:50:46,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:46,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-19 15:50:46,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2021-11-19 15:50:46,009 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 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) [2021-11-19 15:50:47,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:47,242 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2021-11-19 15:50:47,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-19 15:50:47,242 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 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 212 [2021-11-19 15:50:47,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:47,244 INFO L225 Difference]: With dead ends: 458 [2021-11-19 15:50:47,244 INFO L226 Difference]: Without dead ends: 317 [2021-11-19 15:50:47,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 591 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2021-11-19 15:50:47,246 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 299 mSDsluCounter, 751 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:47,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 821 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:50:47,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-19 15:50:47,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2021-11-19 15:50:47,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 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) [2021-11-19 15:50:47,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2021-11-19 15:50:47,270 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2021-11-19 15:50:47,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:47,271 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2021-11-19 15:50:47,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 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) [2021-11-19 15:50:47,271 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2021-11-19 15:50:47,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-19 15:50:47,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:47,273 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:47,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:47,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable978,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:47,489 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:47,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:47,489 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 41 times [2021-11-19 15:50:47,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:47,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504505339] [2021-11-19 15:50:47,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:47,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:47,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:48,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:48,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:48,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504505339] [2021-11-19 15:50:48,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504505339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:48,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052203500] [2021-11-19 15:50:48,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:50:48,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:48,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:48,909 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:48,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-19 15:50:49,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-19 15:50:49,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:49,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-19 15:50:49,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:51,366 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:51,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:51,825 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:51,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052203500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:51,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1449537962] [2021-11-19 15:50:51,827 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:51,827 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:51,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:51,828 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:51,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:51,851 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:51,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:51,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,857 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:51,857 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,859 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:51,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:51,862 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:51,865 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:50:51,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,878 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:51,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:51,884 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:51,886 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:51,887 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:51,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:51,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:51,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,907 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,910 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:50:51,912 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:51,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:50:51,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,932 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:51,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:51,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:51,945 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:51,947 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:51,951 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:51,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:51,954 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:52,812 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:52,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:52,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2021-11-19 15:50:52,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55424471] [2021-11-19 15:50:52,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:52,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-19 15:50:52,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:52,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-19 15:50:52,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2021-11-19 15:50:52,814 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 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) [2021-11-19 15:50:54,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:54,186 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2021-11-19 15:50:54,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-19 15:50:54,186 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 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 214 [2021-11-19 15:50:54,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:54,188 INFO L225 Difference]: With dead ends: 465 [2021-11-19 15:50:54,188 INFO L226 Difference]: Without dead ends: 322 [2021-11-19 15:50:54,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 596 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5781 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2021-11-19 15:50:54,189 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 384 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 1023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:54,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 670 Invalid, 1023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [322 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:50:54,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-19 15:50:54,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2021-11-19 15:50:54,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 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) [2021-11-19 15:50:54,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-11-19 15:50:54,204 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2021-11-19 15:50:54,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:54,204 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-11-19 15:50:54,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 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) [2021-11-19 15:50:54,204 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-11-19 15:50:54,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-11-19 15:50:54,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:54,205 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:54,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:54,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1003 [2021-11-19 15:50:54,406 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:54,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:54,406 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 42 times [2021-11-19 15:50:54,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:54,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246216394] [2021-11-19 15:50:54,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:54,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:54,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:55,036 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:55,036 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:55,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246216394] [2021-11-19 15:50:55,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246216394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:55,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875208083] [2021-11-19 15:50:55,036 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:50:55,036 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:55,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:55,037 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:55,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-19 15:50:55,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:50:55,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:50:55,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-19 15:50:55,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:50:55,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:55,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:50:55,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:55,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875208083] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:50:55,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [549558542] [2021-11-19 15:50:56,000 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:50:56,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:50:56,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:50:56,001 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:50:56,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:50:56,004 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:50:56,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:56,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,008 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:56,008 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:50:56,010 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:50:56,011 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:50:56,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:50:56,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,021 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:50:56,023 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:50:56,025 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:50:56,026 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:50:56,027 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:50:56,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:50:56,030 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:50:56,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,059 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:50:56,062 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:50:56,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:50:56,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,076 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:50:56,077 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:50:56,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:50:56,083 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:56,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:56,088 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:50:56,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:50:56,091 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:50:56,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:50:56,526 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:50:56,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2021-11-19 15:50:56,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437275479] [2021-11-19 15:50:56,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:50:56,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-19 15:50:56,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:50:56,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-19 15:50:56,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=796, Invalid=1754, Unknown=0, NotChecked=0, Total=2550 [2021-11-19 15:50:56,528 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 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) [2021-11-19 15:50:57,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:50:57,215 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2021-11-19 15:50:57,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-19 15:50:57,215 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 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 216 [2021-11-19 15:50:57,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:50:57,216 INFO L225 Difference]: With dead ends: 234 [2021-11-19 15:50:57,216 INFO L226 Difference]: Without dead ends: 232 [2021-11-19 15:50:57,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 668 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2199 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2359, Invalid=5473, Unknown=0, NotChecked=0, Total=7832 [2021-11-19 15:50:57,217 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 264 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:50:57,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 294 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:50:57,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-19 15:50:57,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2021-11-19 15:50:57,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 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) [2021-11-19 15:50:57,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2021-11-19 15:50:57,240 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2021-11-19 15:50:57,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:50:57,240 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2021-11-19 15:50:57,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 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) [2021-11-19 15:50:57,241 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2021-11-19 15:50:57,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-19 15:50:57,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:50:57,242 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:50:57,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-19 15:50:57,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1028 [2021-11-19 15:50:57,458 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:50:57,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:50:57,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 43 times [2021-11-19 15:50:57,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:50:57,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312083253] [2021-11-19 15:50:57,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:50:57,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:50:57,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:59,009 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:50:59,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:50:59,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312083253] [2021-11-19 15:50:59,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312083253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:50:59,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872886049] [2021-11-19 15:50:59,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:50:59,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:50:59,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:50:59,011 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:50:59,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-19 15:50:59,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:50:59,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-19 15:50:59,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:01,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:01,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:02,402 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:02,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872886049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:02,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884246593] [2021-11-19 15:51:02,403 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:02,403 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:02,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:02,403 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:02,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:02,407 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:02,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:02,410 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,412 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:02,412 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:02,418 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:02,420 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:02,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:51:02,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,431 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:02,433 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:02,436 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:02,438 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:02,438 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,440 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:02,440 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:02,442 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,443 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:51:02,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,458 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,460 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:02,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:02,463 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:02,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,480 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:02,482 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:02,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:02,490 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:02,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:02,496 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:02,498 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:02,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:03,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:03,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:03,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2021-11-19 15:51:03,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837550108] [2021-11-19 15:51:03,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:03,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-19 15:51:03,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:03,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-19 15:51:03,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2021-11-19 15:51:03,300 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 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) [2021-11-19 15:51:04,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:04,818 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2021-11-19 15:51:04,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-19 15:51:04,819 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 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 224 [2021-11-19 15:51:04,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:04,821 INFO L225 Difference]: With dead ends: 484 [2021-11-19 15:51:04,821 INFO L226 Difference]: Without dead ends: 335 [2021-11-19 15:51:04,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 625 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6189 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2021-11-19 15:51:04,824 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 332 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 1241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:04,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 871 Invalid, 1241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:51:04,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-11-19 15:51:04,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2021-11-19 15:51:04,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 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) [2021-11-19 15:51:04,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2021-11-19 15:51:04,849 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2021-11-19 15:51:04,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:04,849 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2021-11-19 15:51:04,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 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) [2021-11-19 15:51:04,850 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2021-11-19 15:51:04,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-19 15:51:04,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:04,851 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:04,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:05,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1053,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:05,065 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:05,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:05,065 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 44 times [2021-11-19 15:51:05,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:05,065 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090472125] [2021-11-19 15:51:05,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:05,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:05,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:06,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:06,627 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:06,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090472125] [2021-11-19 15:51:06,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090472125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:06,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383730226] [2021-11-19 15:51:06,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:51:06,628 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:06,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:06,628 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:06,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-19 15:51:06,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-11-19 15:51:06,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:06,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-19 15:51:06,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:09,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:10,080 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:10,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383730226] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:10,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [202792260] [2021-11-19 15:51:10,082 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:10,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:10,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:10,084 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:10,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:10,090 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:10,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:10,094 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,096 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:10,097 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,099 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:10,100 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:10,102 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:10,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:51:10,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,119 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:10,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:10,126 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:10,128 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:10,128 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:10,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:10,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:10,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:10,154 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:10,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:10,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,179 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:10,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:10,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:10,193 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:10,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:10,201 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:10,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:10,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:10,968 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:10,968 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:10,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2021-11-19 15:51:10,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139357407] [2021-11-19 15:51:10,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:10,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-19 15:51:10,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:10,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-19 15:51:10,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2021-11-19 15:51:10,971 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 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) [2021-11-19 15:51:12,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:12,618 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2021-11-19 15:51:12,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-19 15:51:12,618 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 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 226 [2021-11-19 15:51:12,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:12,623 INFO L225 Difference]: With dead ends: 491 [2021-11-19 15:51:12,623 INFO L226 Difference]: Without dead ends: 340 [2021-11-19 15:51:12,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6370 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2021-11-19 15:51:12,626 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 281 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 918 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:12,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 918 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:51:12,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-19 15:51:12,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2021-11-19 15:51:12,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 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) [2021-11-19 15:51:12,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2021-11-19 15:51:12,645 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2021-11-19 15:51:12,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:12,645 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2021-11-19 15:51:12,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 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) [2021-11-19 15:51:12,646 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2021-11-19 15:51:12,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-19 15:51:12,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:12,647 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:12,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:12,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1078 [2021-11-19 15:51:12,862 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:12,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:12,862 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 45 times [2021-11-19 15:51:12,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:12,862 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618583581] [2021-11-19 15:51:12,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:12,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:12,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:13,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:13,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:13,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618583581] [2021-11-19 15:51:13,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618583581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:13,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505100820] [2021-11-19 15:51:13,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:51:13,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:13,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:13,543 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:13,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-19 15:51:13,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:51:13,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:13,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-19 15:51:13,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:14,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:14,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:14,599 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:14,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505100820] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:14,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [462446067] [2021-11-19 15:51:14,600 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:14,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:14,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:14,600 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:14,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:14,616 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:14,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:14,619 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,620 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:14,621 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,622 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:14,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:14,624 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:14,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:51:14,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,636 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:14,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:14,641 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:14,642 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:14,643 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:14,645 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:14,650 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:51:14,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,661 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,663 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:51:14,664 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:14,666 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:51:14,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,681 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:14,682 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:14,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:14,691 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:14,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:14,698 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:14,700 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:14,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:15,306 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:15,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:15,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2021-11-19 15:51:15,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998783048] [2021-11-19 15:51:15,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:15,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-19 15:51:15,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:15,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-19 15:51:15,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=875, Invalid=1881, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 15:51:15,309 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 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) [2021-11-19 15:51:16,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:16,274 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2021-11-19 15:51:16,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-19 15:51:16,274 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 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 228 [2021-11-19 15:51:16,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:16,276 INFO L225 Difference]: With dead ends: 246 [2021-11-19 15:51:16,277 INFO L226 Difference]: Without dead ends: 244 [2021-11-19 15:51:16,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 706 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2395 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2600, Invalid=5956, Unknown=0, NotChecked=0, Total=8556 [2021-11-19 15:51:16,279 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 208 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:16,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 345 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:51:16,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-19 15:51:16,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2021-11-19 15:51:16,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 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) [2021-11-19 15:51:16,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2021-11-19 15:51:16,312 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2021-11-19 15:51:16,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:16,313 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2021-11-19 15:51:16,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 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) [2021-11-19 15:51:16,313 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2021-11-19 15:51:16,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-19 15:51:16,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:16,315 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:16,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-19 15:51:16,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1103 [2021-11-19 15:51:16,530 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:16,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:16,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 46 times [2021-11-19 15:51:16,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:16,530 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8258206] [2021-11-19 15:51:16,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:16,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:16,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:18,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:18,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:18,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8258206] [2021-11-19 15:51:18,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8258206] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:18,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724057763] [2021-11-19 15:51:18,509 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:51:18,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:18,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:18,510 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:18,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-19 15:51:18,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:18,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-19 15:51:18,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:21,316 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:21,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:21,867 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:21,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724057763] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:21,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503657105] [2021-11-19 15:51:21,868 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:21,868 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:21,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:21,868 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:21,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:21,885 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:21,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:21,890 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,892 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:21,893 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,894 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:21,895 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:21,898 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:21,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:51:21,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,914 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:21,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:21,921 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:21,922 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:21,923 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,925 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:21,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:21,928 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,930 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:21,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,944 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:51:21,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:21,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:51:21,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,971 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:21,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:21,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:21,982 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:21,984 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:21,988 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:21,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:21,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:22,905 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:22,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:22,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2021-11-19 15:51:22,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216462787] [2021-11-19 15:51:22,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:22,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-19 15:51:22,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:22,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-19 15:51:22,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2021-11-19 15:51:22,914 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 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) [2021-11-19 15:51:24,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:24,872 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2021-11-19 15:51:24,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-19 15:51:24,873 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 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 236 [2021-11-19 15:51:24,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:24,874 INFO L225 Difference]: With dead ends: 510 [2021-11-19 15:51:24,875 INFO L226 Difference]: Without dead ends: 353 [2021-11-19 15:51:24,876 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 659 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6798 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2021-11-19 15:51:24,877 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 382 mSDsluCounter, 724 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:24,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 802 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:51:24,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-19 15:51:24,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2021-11-19 15:51:24,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 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) [2021-11-19 15:51:24,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2021-11-19 15:51:24,899 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2021-11-19 15:51:24,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:24,899 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2021-11-19 15:51:24,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 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) [2021-11-19 15:51:24,900 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2021-11-19 15:51:24,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-19 15:51:24,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:24,901 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:24,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:25,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1128 [2021-11-19 15:51:25,102 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:25,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:25,102 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 47 times [2021-11-19 15:51:25,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:25,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392079452] [2021-11-19 15:51:25,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:25,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:25,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:27,127 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:27,127 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:27,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392079452] [2021-11-19 15:51:27,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392079452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:27,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603799426] [2021-11-19 15:51:27,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:51:27,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:27,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:27,128 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:27,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-19 15:51:27,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2021-11-19 15:51:27,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:27,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-19 15:51:27,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:30,147 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:30,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:30,609 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:30,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603799426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:30,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [926786679] [2021-11-19 15:51:30,610 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:30,610 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:30,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:30,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:30,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:30,614 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:30,615 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:30,616 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,618 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:30,618 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:30,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:30,621 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:30,623 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:51:30,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,631 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:30,632 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:30,635 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:30,636 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:30,636 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:30,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:30,640 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,641 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:30,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,649 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:30,652 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:30,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:30,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,686 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:30,689 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:30,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:30,699 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:30,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:30,705 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:30,707 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:30,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:31,607 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:31,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:31,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2021-11-19 15:51:31,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882360091] [2021-11-19 15:51:31,608 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:31,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-19 15:51:31,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:31,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-19 15:51:31,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2021-11-19 15:51:31,611 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 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) [2021-11-19 15:51:33,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:33,373 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2021-11-19 15:51:33,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-19 15:51:33,373 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 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 238 [2021-11-19 15:51:33,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:33,375 INFO L225 Difference]: With dead ends: 517 [2021-11-19 15:51:33,375 INFO L226 Difference]: Without dead ends: 358 [2021-11-19 15:51:33,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 664 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6987 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2021-11-19 15:51:33,377 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 343 mSDsluCounter, 773 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:33,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 853 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:51:33,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-19 15:51:33,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2021-11-19 15:51:33,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 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) [2021-11-19 15:51:33,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2021-11-19 15:51:33,406 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2021-11-19 15:51:33,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:33,406 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2021-11-19 15:51:33,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 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) [2021-11-19 15:51:33,407 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2021-11-19 15:51:33,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-19 15:51:33,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:33,409 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:33,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:33,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1153,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:33,622 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:33,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:33,622 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 48 times [2021-11-19 15:51:33,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:33,622 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555888714] [2021-11-19 15:51:33,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:33,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:33,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:34,492 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:34,492 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:34,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555888714] [2021-11-19 15:51:34,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555888714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:34,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306897018] [2021-11-19 15:51:34,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:51:34,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:34,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:34,494 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:34,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-19 15:51:34,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:51:34,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:34,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-19 15:51:34,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:35,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:35,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:35,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:35,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306897018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:35,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [584629979] [2021-11-19 15:51:35,841 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:35,841 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:35,841 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:35,841 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:35,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:35,853 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:35,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:35,856 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,857 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:35,858 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:35,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:35,862 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:35,864 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:51:35,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,888 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:35,891 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:35,895 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:35,897 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:35,897 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:35,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:35,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:35,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,917 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:35,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:35,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:35,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,936 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:35,938 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:35,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:35,948 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:35,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:35,954 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:35,956 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:35,957 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:36,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:36,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:36,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2021-11-19 15:51:36,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834323632] [2021-11-19 15:51:36,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:36,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 15:51:36,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:36,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 15:51:36,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=2012, Unknown=0, NotChecked=0, Total=2970 [2021-11-19 15:51:36,476 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 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) [2021-11-19 15:51:37,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:37,363 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2021-11-19 15:51:37,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-19 15:51:37,364 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 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 240 [2021-11-19 15:51:37,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:37,365 INFO L225 Difference]: With dead ends: 258 [2021-11-19 15:51:37,365 INFO L226 Difference]: Without dead ends: 256 [2021-11-19 15:51:37,366 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 744 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2853, Invalid=6459, Unknown=0, NotChecked=0, Total=9312 [2021-11-19 15:51:37,367 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 304 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:37,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 292 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 15:51:37,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-19 15:51:37,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2021-11-19 15:51:37,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 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) [2021-11-19 15:51:37,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2021-11-19 15:51:37,396 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2021-11-19 15:51:37,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:37,397 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2021-11-19 15:51:37,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 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) [2021-11-19 15:51:37,397 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2021-11-19 15:51:37,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-19 15:51:37,399 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:37,399 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:37,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:37,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1178 [2021-11-19 15:51:37,618 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:37,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:37,618 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 49 times [2021-11-19 15:51:37,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:37,618 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849736785] [2021-11-19 15:51:37,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:37,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:37,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:39,681 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:39,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:39,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849736785] [2021-11-19 15:51:39,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849736785] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:39,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848749869] [2021-11-19 15:51:39,682 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:51:39,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:39,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:39,690 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:39,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-19 15:51:39,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:39,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-19 15:51:39,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:42,905 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:42,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:43,412 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:51:43,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848749869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:43,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770091501] [2021-11-19 15:51:43,413 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:43,413 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:43,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:43,413 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:43,414 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:43,418 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:43,419 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:43,420 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,422 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:43,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:43,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:43,425 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:43,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:51:43,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,446 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:43,449 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:43,452 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:43,454 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:43,454 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:43,456 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:43,458 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,459 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:51:43,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:43,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:43,471 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:43,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,483 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:43,485 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:43,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:43,492 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:43,494 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:43,498 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:43,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:43,500 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:44,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:44,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:44,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2021-11-19 15:51:44,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942355751] [2021-11-19 15:51:44,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:44,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-19 15:51:44,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:44,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-19 15:51:44,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2021-11-19 15:51:44,323 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 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) [2021-11-19 15:51:46,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:46,224 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2021-11-19 15:51:46,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-19 15:51:46,224 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 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 248 [2021-11-19 15:51:46,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:46,226 INFO L225 Difference]: With dead ends: 536 [2021-11-19 15:51:46,226 INFO L226 Difference]: Without dead ends: 371 [2021-11-19 15:51:46,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 693 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7435 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2021-11-19 15:51:46,229 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 465 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 815 mSolverCounterSat, 503 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 503 IncrementalHoareTripleChecker+Valid, 815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:46,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [465 Valid, 776 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [503 Valid, 815 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:51:46,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-11-19 15:51:46,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2021-11-19 15:51:46,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 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) [2021-11-19 15:51:46,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2021-11-19 15:51:46,295 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2021-11-19 15:51:46,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:46,295 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2021-11-19 15:51:46,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 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) [2021-11-19 15:51:46,296 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2021-11-19 15:51:46,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-19 15:51:46,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:46,298 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:46,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:46,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1203 [2021-11-19 15:51:46,509 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:46,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:46,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 50 times [2021-11-19 15:51:46,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:46,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730558265] [2021-11-19 15:51:46,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:46,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:46,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:48,710 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:48,711 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:48,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730558265] [2021-11-19 15:51:48,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730558265] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:48,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564018770] [2021-11-19 15:51:48,711 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:51:48,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:48,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:48,715 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:48,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-19 15:51:48,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-19 15:51:48,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:49,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-19 15:51:49,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:52,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:52,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:52,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:52,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564018770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:52,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404778784] [2021-11-19 15:51:52,908 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:52,908 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:52,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:52,908 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:52,908 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:52,941 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:52,943 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:52,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,947 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:52,948 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,949 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:52,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:52,952 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:52,955 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:51:52,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,968 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:52,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:52,974 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:52,975 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:52,976 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:52,978 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:52,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,982 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:52,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:52,995 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,996 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:52,998 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:52,999 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:53,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,014 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:53,015 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:53,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:53,023 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:53,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:53,029 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:53,031 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:53,032 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:53,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:53,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:53,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2021-11-19 15:51:53,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109902332] [2021-11-19 15:51:53,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:53,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-19 15:51:53,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:53,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-19 15:51:53,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2021-11-19 15:51:53,864 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 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) [2021-11-19 15:51:55,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:55,694 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2021-11-19 15:51:55,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-19 15:51:55,694 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 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 250 [2021-11-19 15:51:55,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:55,696 INFO L225 Difference]: With dead ends: 543 [2021-11-19 15:51:55,697 INFO L226 Difference]: Without dead ends: 376 [2021-11-19 15:51:55,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 698 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7632 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2021-11-19 15:51:55,699 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 352 mSDsluCounter, 879 mSDsCounter, 0 mSdLazyCounter, 1012 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 1012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:55,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 963 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 1012 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:51:55,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-19 15:51:55,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2021-11-19 15:51:55,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 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) [2021-11-19 15:51:55,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2021-11-19 15:51:55,731 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2021-11-19 15:51:55,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:55,732 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2021-11-19 15:51:55,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 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) [2021-11-19 15:51:55,732 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2021-11-19 15:51:55,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-19 15:51:55,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:55,734 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:55,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-19 15:51:55,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1228,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:55,950 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:51:55,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:51:55,950 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 51 times [2021-11-19 15:51:55,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:51:55,950 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34434952] [2021-11-19 15:51:55,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:51:55,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:51:56,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:51:56,780 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:56,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:51:56,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34434952] [2021-11-19 15:51:56,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34434952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:51:56,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358723115] [2021-11-19 15:51:56,781 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:51:56,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:51:56,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:51:56,781 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:51:56,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-19 15:51:56,903 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:51:56,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:51:56,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-19 15:51:56,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:51:57,503 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:57,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:51:58,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:51:58,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358723115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:51:58,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038538730] [2021-11-19 15:51:58,123 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:51:58,123 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:51:58,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:51:58,123 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:51:58,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:51:58,145 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:51:58,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:51:58,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,152 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:58,152 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:51:58,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:51:58,157 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:51:58,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:51:58,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,174 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:51:58,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:51:58,179 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:51:58,180 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:51:58,180 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:51:58,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:51:58,184 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,185 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:51:58,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,195 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:51:58,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:51:58,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:51:58,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,222 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:51:58,224 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:51:58,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:51:58,236 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:58,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:58,244 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:51:58,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:51:58,248 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:51:58,830 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:51:58,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:51:58,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2021-11-19 15:51:58,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020632834] [2021-11-19 15:51:58,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:51:58,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-19 15:51:58,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:51:58,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-19 15:51:58,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=2147, Unknown=0, NotChecked=0, Total=3192 [2021-11-19 15:51:58,833 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 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) [2021-11-19 15:51:59,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:51:59,805 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2021-11-19 15:51:59,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-19 15:51:59,805 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 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 252 [2021-11-19 15:51:59,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:51:59,807 INFO L225 Difference]: With dead ends: 270 [2021-11-19 15:51:59,807 INFO L226 Difference]: Without dead ends: 268 [2021-11-19 15:51:59,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 782 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3118, Invalid=6982, Unknown=0, NotChecked=0, Total=10100 [2021-11-19 15:51:59,808 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 317 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:51:59,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 316 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:51:59,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-19 15:51:59,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2021-11-19 15:51:59,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 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) [2021-11-19 15:51:59,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2021-11-19 15:51:59,829 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2021-11-19 15:51:59,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:51:59,829 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2021-11-19 15:51:59,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 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) [2021-11-19 15:51:59,830 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2021-11-19 15:51:59,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-19 15:51:59,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:51:59,832 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:51:59,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-19 15:52:00,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1253 [2021-11-19 15:52:00,058 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:00,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:00,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 52 times [2021-11-19 15:52:00,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:00,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508943343] [2021-11-19 15:52:00,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:00,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:00,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:02,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:02,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:02,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508943343] [2021-11-19 15:52:02,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508943343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:02,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883324603] [2021-11-19 15:52:02,608 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:52:02,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:02,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:02,609 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:02,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-19 15:52:02,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:02,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-19 15:52:02,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:06,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:52:06,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:07,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:52:07,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883324603] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:07,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706260497] [2021-11-19 15:52:07,014 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:07,014 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:07,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:07,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:07,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:07,018 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:07,019 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:07,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,022 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:07,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:07,024 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:07,025 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:07,027 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:52:07,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,036 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:07,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:07,040 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:07,041 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:07,042 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:07,071 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:07,073 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:52:07,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,087 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,089 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:07,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:07,093 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:07,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,111 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:07,113 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:07,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:07,124 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:07,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:07,131 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:07,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:07,134 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:08,047 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:08,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:08,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2021-11-19 15:52:08,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629534687] [2021-11-19 15:52:08,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:08,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-19 15:52:08,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:08,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-19 15:52:08,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2021-11-19 15:52:08,050 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 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) [2021-11-19 15:52:10,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:10,116 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2021-11-19 15:52:10,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-19 15:52:10,117 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 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 260 [2021-11-19 15:52:10,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:10,119 INFO L225 Difference]: With dead ends: 562 [2021-11-19 15:52:10,119 INFO L226 Difference]: Without dead ends: 389 [2021-11-19 15:52:10,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 727 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8100 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2021-11-19 15:52:10,121 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 390 mSDsluCounter, 1009 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 1490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:10,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [390 Valid, 1095 Invalid, 1490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:52:10,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-11-19 15:52:10,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2021-11-19 15:52:10,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 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) [2021-11-19 15:52:10,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2021-11-19 15:52:10,162 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2021-11-19 15:52:10,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:10,162 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2021-11-19 15:52:10,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 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) [2021-11-19 15:52:10,163 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2021-11-19 15:52:10,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-19 15:52:10,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:10,165 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:10,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:10,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1278 [2021-11-19 15:52:10,378 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:10,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:10,378 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 53 times [2021-11-19 15:52:10,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:10,378 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786894494] [2021-11-19 15:52:10,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:10,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:10,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:12,785 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:12,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:12,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786894494] [2021-11-19 15:52:12,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786894494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:12,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669234772] [2021-11-19 15:52:12,786 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:52:12,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:12,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:12,789 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:12,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-19 15:52:13,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-19 15:52:13,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:52:13,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-19 15:52:13,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:15,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:15,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:16,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:16,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669234772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:16,306 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031506929] [2021-11-19 15:52:16,307 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:16,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:16,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:16,307 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:16,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:16,315 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:16,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:16,318 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,320 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:16,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:16,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:16,324 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:16,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:52:16,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,336 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:16,338 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:16,346 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:16,347 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:16,347 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:16,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:16,351 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:52:16,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,361 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:16,364 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:16,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:16,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,412 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:16,414 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:16,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:16,427 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:16,429 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:16,435 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:16,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:16,439 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:17,440 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:17,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:17,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 45, 45] total 132 [2021-11-19 15:52:17,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624531269] [2021-11-19 15:52:17,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:17,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-19 15:52:17,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:17,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-19 15:52:17,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3047, Invalid=16693, Unknown=0, NotChecked=0, Total=19740 [2021-11-19 15:52:17,444 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 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) [2021-11-19 15:52:23,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:23,443 INFO L93 Difference]: Finished difference Result 576 states and 623 transitions. [2021-11-19 15:52:23,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-11-19 15:52:23,444 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 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 262 [2021-11-19 15:52:23,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:23,445 INFO L225 Difference]: With dead ends: 576 [2021-11-19 15:52:23,446 INFO L226 Difference]: Without dead ends: 401 [2021-11-19 15:52:23,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 775 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33778 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=14832, Invalid=82824, Unknown=0, NotChecked=0, Total=97656 [2021-11-19 15:52:23,450 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 742 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 2786 mSolverCounterSat, 680 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 742 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 3466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 680 IncrementalHoareTripleChecker+Valid, 2786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:23,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [742 Valid, 677 Invalid, 3466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [680 Valid, 2786 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-19 15:52:23,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-19 15:52:23,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 269. [2021-11-19 15:52:23,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 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) [2021-11-19 15:52:23,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2021-11-19 15:52:23,495 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 262 [2021-11-19 15:52:23,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:23,495 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2021-11-19 15:52:23,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 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) [2021-11-19 15:52:23,496 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2021-11-19 15:52:23,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-19 15:52:23,498 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:23,498 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:23,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:23,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1303 [2021-11-19 15:52:23,714 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:23,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:23,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1043592072, now seen corresponding path program 54 times [2021-11-19 15:52:23,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:23,714 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680276392] [2021-11-19 15:52:23,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:23,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:23,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:26,137 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:26,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:26,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680276392] [2021-11-19 15:52:26,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680276392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:26,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791334534] [2021-11-19 15:52:26,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:52:26,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:26,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:26,139 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:26,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-19 15:52:26,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:52:26,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:52:26,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-19 15:52:26,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:29,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:29,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:30,459 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:30,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791334534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:30,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2015017699] [2021-11-19 15:52:30,461 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:30,461 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:30,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:30,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:30,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:30,465 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:30,466 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:30,467 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,469 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:30,469 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,470 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:30,470 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:30,486 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:30,489 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:52:30,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,497 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:30,498 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:30,501 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:30,501 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:30,502 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:30,503 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:30,505 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:52:30,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,518 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:30,521 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:30,523 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:30,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,545 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:30,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:30,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:30,560 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:30,561 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:30,566 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:30,568 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:30,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:31,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:31,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:31,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 136 [2021-11-19 15:52:31,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180693265] [2021-11-19 15:52:31,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:31,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-19 15:52:31,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:31,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-19 15:52:31,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4259, Invalid=16621, Unknown=0, NotChecked=0, Total=20880 [2021-11-19 15:52:31,559 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 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) [2021-11-19 15:52:33,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:33,738 INFO L93 Difference]: Finished difference Result 582 states and 629 transitions. [2021-11-19 15:52:33,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-19 15:52:33,738 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 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 268 [2021-11-19 15:52:33,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:33,740 INFO L225 Difference]: With dead ends: 582 [2021-11-19 15:52:33,740 INFO L226 Difference]: Without dead ends: 403 [2021-11-19 15:52:33,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 749 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8652 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=8221, Invalid=27311, Unknown=0, NotChecked=0, Total=35532 [2021-11-19 15:52:33,743 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 367 mSDsluCounter, 970 mSDsCounter, 0 mSdLazyCounter, 1098 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 1398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 1098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:33,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [367 Valid, 1060 Invalid, 1398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 1098 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:52:33,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-19 15:52:33,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 271. [2021-11-19 15:52:33,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.011111111111111) internal successors, (273), 270 states have internal predecessors, (273), 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) [2021-11-19 15:52:33,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 273 transitions. [2021-11-19 15:52:33,785 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 273 transitions. Word has length 268 [2021-11-19 15:52:33,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:33,786 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 273 transitions. [2021-11-19 15:52:33,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 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) [2021-11-19 15:52:33,786 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 273 transitions. [2021-11-19 15:52:33,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-19 15:52:33,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:33,788 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:33,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:34,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1328,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:34,002 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:34,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:34,002 INFO L85 PathProgramCache]: Analyzing trace with hash -751406499, now seen corresponding path program 55 times [2021-11-19 15:52:34,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:34,002 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54914837] [2021-11-19 15:52:34,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:34,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:34,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:34,990 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1892 proven. 3786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:34,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:34,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54914837] [2021-11-19 15:52:34,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54914837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:34,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904153813] [2021-11-19 15:52:34,991 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:52:34,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:34,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:34,992 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:34,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-19 15:52:35,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:35,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-19 15:52:35,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:35,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:35,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:36,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:36,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904153813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:36,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140659787] [2021-11-19 15:52:36,383 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:36,383 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:36,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:36,384 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:36,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:36,392 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:36,393 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:36,395 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,397 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:36,397 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,398 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:36,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:36,400 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:36,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:52:36,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,413 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:36,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:36,417 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:36,418 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:36,419 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:36,420 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:36,422 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,424 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:36,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,432 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,434 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:36,435 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:36,437 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:36,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,450 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:36,452 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:36,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:36,461 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:36,462 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:36,467 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:36,468 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:36,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:37,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:37,031 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:37,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 50 [2021-11-19 15:52:37,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62871119] [2021-11-19 15:52:37,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:37,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-19 15:52:37,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:37,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-19 15:52:37,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1183, Invalid=2357, Unknown=0, NotChecked=0, Total=3540 [2021-11-19 15:52:37,033 INFO L87 Difference]: Start difference. First operand 271 states and 273 transitions. Second operand has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 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) [2021-11-19 15:52:38,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:38,093 INFO L93 Difference]: Finished difference Result 288 states and 291 transitions. [2021-11-19 15:52:38,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-19 15:52:38,093 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 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 270 [2021-11-19 15:52:38,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:38,095 INFO L225 Difference]: With dead ends: 288 [2021-11-19 15:52:38,095 INFO L226 Difference]: Without dead ends: 286 [2021-11-19 15:52:38,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 945 GetRequests, 839 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3144 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3538, Invalid=7804, Unknown=0, NotChecked=0, Total=11342 [2021-11-19 15:52:38,096 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 331 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:38,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 368 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:52:38,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-19 15:52:38,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 279. [2021-11-19 15:52:38,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0107913669064748) internal successors, (281), 278 states have internal predecessors, (281), 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) [2021-11-19 15:52:38,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 281 transitions. [2021-11-19 15:52:38,123 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 281 transitions. Word has length 270 [2021-11-19 15:52:38,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:38,124 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 281 transitions. [2021-11-19 15:52:38,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 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) [2021-11-19 15:52:38,124 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 281 transitions. [2021-11-19 15:52:38,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-19 15:52:38,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:38,127 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:38,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:38,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1353 [2021-11-19 15:52:38,342 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:38,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:38,342 INFO L85 PathProgramCache]: Analyzing trace with hash 1028462403, now seen corresponding path program 56 times [2021-11-19 15:52:38,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:38,342 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570972836] [2021-11-19 15:52:38,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:38,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:38,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 3918 proven. 2112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:40,797 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:40,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570972836] [2021-11-19 15:52:40,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570972836] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:40,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835190449] [2021-11-19 15:52:40,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:52:40,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:40,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:40,798 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:40,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-19 15:52:41,102 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-19 15:52:41,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:52:41,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-19 15:52:41,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:45,279 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:45,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:46,125 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:46,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835190449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:46,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [585638414] [2021-11-19 15:52:46,126 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:46,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:46,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:46,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:46,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:46,130 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:46,132 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:46,133 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,135 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:46,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:46,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:46,139 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:46,141 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:52:46,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,151 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:46,153 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:46,156 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:46,157 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:46,157 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:46,159 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:46,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:52:46,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,176 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:46,180 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:46,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:46,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,204 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:46,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:46,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:46,214 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:46,217 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:46,221 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:46,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:46,224 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:47,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:47,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:47,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 143 [2021-11-19 15:52:47,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614741490] [2021-11-19 15:52:47,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:47,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-19 15:52:47,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:47,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-19 15:52:47,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4730, Invalid=18222, Unknown=0, NotChecked=0, Total=22952 [2021-11-19 15:52:47,233 INFO L87 Difference]: Start difference. First operand 279 states and 281 transitions. Second operand has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 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) [2021-11-19 15:52:51,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:51,569 INFO L93 Difference]: Finished difference Result 787 states and 837 transitions. [2021-11-19 15:52:51,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-19 15:52:51,570 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 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 278 [2021-11-19 15:52:51,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:51,572 INFO L225 Difference]: With dead ends: 787 [2021-11-19 15:52:51,572 INFO L226 Difference]: Without dead ends: 421 [2021-11-19 15:52:51,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15084 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=13331, Invalid=45475, Unknown=0, NotChecked=0, Total=58806 [2021-11-19 15:52:51,575 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 668 mSDsluCounter, 1256 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 481 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 1348 SdHoareTripleChecker+Invalid, 1895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:51,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 1348 Invalid, 1895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 15:52:51,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-19 15:52:51,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 283. [2021-11-19 15:52:51,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0106382978723405) internal successors, (285), 282 states have internal predecessors, (285), 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) [2021-11-19 15:52:51,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 285 transitions. [2021-11-19 15:52:51,612 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 285 transitions. Word has length 278 [2021-11-19 15:52:51,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:51,612 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 285 transitions. [2021-11-19 15:52:51,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 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) [2021-11-19 15:52:51,613 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 285 transitions. [2021-11-19 15:52:51,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-19 15:52:51,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:51,615 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:51,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:51,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1378 [2021-11-19 15:52:51,826 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:51,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:51,826 INFO L85 PathProgramCache]: Analyzing trace with hash -863970995, now seen corresponding path program 57 times [2021-11-19 15:52:51,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:51,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063820016] [2021-11-19 15:52:51,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:51,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:51,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:52,886 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2070 proven. 4142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:52,886 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:52,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063820016] [2021-11-19 15:52:52,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063820016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:52,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560087416] [2021-11-19 15:52:52,886 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:52:52,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:52,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:52,887 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:52,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-19 15:52:53,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:52:53,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:52:53,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 1047 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-19 15:52:53,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:52:53,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:53,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:52:54,236 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:54,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560087416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:52:54,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114179569] [2021-11-19 15:52:54,237 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:52:54,237 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:52:54,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:52:54,237 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:52:54,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:52:54,252 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:52:54,254 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:52:54,256 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,257 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:54,258 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:52:54,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:52:54,261 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:52:54,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:52:54,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,285 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:52:54,287 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:52:54,291 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:52:54,292 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:52:54,293 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:52:54,294 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:52:54,296 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,297 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:54,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,345 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:52:54,348 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:52:54,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:52:54,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,362 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:52:54,363 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:52:54,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:52:54,370 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:54,372 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:54,375 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:52:54,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:52:54,378 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:52:54,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:52:54,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:52:54,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2021-11-19 15:52:54,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228476634] [2021-11-19 15:52:54,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:52:54,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-19 15:52:54,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:52:54,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-19 15:52:54,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=2502, Unknown=0, NotChecked=0, Total=3782 [2021-11-19 15:52:54,878 INFO L87 Difference]: Start difference. First operand 283 states and 285 transitions. Second operand has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 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) [2021-11-19 15:52:55,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:52:55,932 INFO L93 Difference]: Finished difference Result 300 states and 303 transitions. [2021-11-19 15:52:55,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-19 15:52:55,933 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 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 282 [2021-11-19 15:52:55,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:52:55,935 INFO L225 Difference]: With dead ends: 300 [2021-11-19 15:52:55,935 INFO L226 Difference]: Without dead ends: 298 [2021-11-19 15:52:55,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 877 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3833, Invalid=8377, Unknown=0, NotChecked=0, Total=12210 [2021-11-19 15:52:55,936 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 300 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:52:55,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 370 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:52:55,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-19 15:52:55,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 291. [2021-11-19 15:52:55,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 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) [2021-11-19 15:52:55,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2021-11-19 15:52:55,966 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 282 [2021-11-19 15:52:55,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:52:55,966 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2021-11-19 15:52:55,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 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) [2021-11-19 15:52:55,967 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2021-11-19 15:52:55,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-19 15:52:55,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:52:55,968 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:52:55,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-19 15:52:56,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1403 [2021-11-19 15:52:56,169 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:52:56,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:52:56,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1862693325, now seen corresponding path program 58 times [2021-11-19 15:52:56,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:52:56,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625866685] [2021-11-19 15:52:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:52:56,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:52:56,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:59,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4280 proven. 2300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:52:59,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:52:59,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625866685] [2021-11-19 15:52:59,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625866685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:52:59,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755692842] [2021-11-19 15:52:59,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:52:59,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:52:59,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:52:59,099 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:52:59,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-19 15:52:59,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:52:59,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 1071 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-19 15:52:59,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:03,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:53:03,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:04,329 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:53:04,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755692842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:04,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1113088099] [2021-11-19 15:53:04,330 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:04,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:04,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:04,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:04,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:04,361 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:04,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:04,364 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,366 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:04,367 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:04,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:04,372 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:04,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:53:04,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,382 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:04,384 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:04,387 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:04,389 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:04,390 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:04,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:04,395 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,397 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:53:04,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,410 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,412 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:53:04,414 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:04,417 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:53:04,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,434 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:04,436 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:04,437 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:04,447 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:04,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:04,455 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:04,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:04,458 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:05,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:05,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:05,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 96, 96] total 146 [2021-11-19 15:53:05,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332965690] [2021-11-19 15:53:05,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:05,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-19 15:53:05,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:05,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-19 15:53:05,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4878, Invalid=18992, Unknown=0, NotChecked=0, Total=23870 [2021-11-19 15:53:05,529 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 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) [2021-11-19 15:53:08,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:08,344 INFO L93 Difference]: Finished difference Result 627 states and 677 transitions. [2021-11-19 15:53:08,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-19 15:53:08,344 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 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 290 [2021-11-19 15:53:08,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:08,346 INFO L225 Difference]: With dead ends: 627 [2021-11-19 15:53:08,346 INFO L226 Difference]: Without dead ends: 434 [2021-11-19 15:53:08,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1012 GetRequests, 812 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9885 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=9392, Invalid=31210, Unknown=0, NotChecked=0, Total=40602 [2021-11-19 15:53:08,351 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 422 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 1620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:08,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 1186 Invalid, 1620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:53:08,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-19 15:53:08,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 293. [2021-11-19 15:53:08,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.0102739726027397) internal successors, (295), 292 states have internal predecessors, (295), 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) [2021-11-19 15:53:08,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 295 transitions. [2021-11-19 15:53:08,382 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 295 transitions. Word has length 290 [2021-11-19 15:53:08,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:08,382 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 295 transitions. [2021-11-19 15:53:08,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 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) [2021-11-19 15:53:08,383 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 295 transitions. [2021-11-19 15:53:08,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-19 15:53:08,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:08,385 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:08,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:08,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1428 [2021-11-19 15:53:08,599 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:08,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:08,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1186482776, now seen corresponding path program 59 times [2021-11-19 15:53:08,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:08,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867760523] [2021-11-19 15:53:08,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:08,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:11,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4280 proven. 2394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:11,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:53:11,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867760523] [2021-11-19 15:53:11,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867760523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:53:11,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343472595] [2021-11-19 15:53:11,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:53:11,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:11,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:53:11,719 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:53:11,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-19 15:53:12,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2021-11-19 15:53:12,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:53:12,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 1081 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-19 15:53:12,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:16,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:16,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:17,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:17,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343472595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:17,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837965457] [2021-11-19 15:53:17,332 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:17,332 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:17,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:17,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:17,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:17,337 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:17,338 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:17,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,341 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:17,342 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:17,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:17,346 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:17,348 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:53:17,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,357 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:17,359 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:17,362 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:17,363 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:17,364 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:17,366 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:17,368 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,369 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:17,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:53:17,382 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:17,384 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:53:17,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,401 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:17,403 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:17,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:17,416 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:17,418 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:17,424 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:17,427 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:17,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:18,527 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:18,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:18,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 148 [2021-11-19 15:53:18,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279247065] [2021-11-19 15:53:18,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:18,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-19 15:53:18,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:18,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-19 15:53:18,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5027, Invalid=19465, Unknown=0, NotChecked=0, Total=24492 [2021-11-19 15:53:18,530 INFO L87 Difference]: Start difference. First operand 293 states and 295 transitions. Second operand has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 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) [2021-11-19 15:53:21,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:21,062 INFO L93 Difference]: Finished difference Result 634 states and 685 transitions. [2021-11-19 15:53:21,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-19 15:53:21,063 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 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 292 [2021-11-19 15:53:21,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:21,065 INFO L225 Difference]: With dead ends: 634 [2021-11-19 15:53:21,065 INFO L226 Difference]: Without dead ends: 439 [2021-11-19 15:53:21,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1020 GetRequests, 817 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10110 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=9733, Invalid=32087, Unknown=0, NotChecked=0, Total=41820 [2021-11-19 15:53:21,068 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 537 mSDsluCounter, 998 mSDsCounter, 0 mSdLazyCounter, 1151 mSolverCounterSat, 395 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 1096 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 395 IncrementalHoareTripleChecker+Valid, 1151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:21,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [537 Valid, 1096 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [395 Valid, 1151 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 15:53:21,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-11-19 15:53:21,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 295. [2021-11-19 15:53:21,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 1.010204081632653) internal successors, (297), 294 states have internal predecessors, (297), 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) [2021-11-19 15:53:21,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 297 transitions. [2021-11-19 15:53:21,112 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 297 transitions. Word has length 292 [2021-11-19 15:53:21,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:21,112 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 297 transitions. [2021-11-19 15:53:21,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 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) [2021-11-19 15:53:21,113 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 297 transitions. [2021-11-19 15:53:21,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2021-11-19 15:53:21,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:21,115 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:21,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:21,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1453 [2021-11-19 15:53:21,318 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:21,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:21,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2017947331, now seen corresponding path program 60 times [2021-11-19 15:53:21,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:21,318 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29640396] [2021-11-19 15:53:21,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:21,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:21,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:22,591 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2256 proven. 4514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:22,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:53:22,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29640396] [2021-11-19 15:53:22,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29640396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:53:22,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193788261] [2021-11-19 15:53:22,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:53:22,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:22,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:53:22,592 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:53:22,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-19 15:53:22,751 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:53:22,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:53:22,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 1091 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-19 15:53:22,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:23,438 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:23,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:24,174 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:24,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193788261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:24,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692661401] [2021-11-19 15:53:24,175 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:24,175 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:24,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:24,175 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:24,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:24,179 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:24,180 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:24,181 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,182 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:24,183 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:24,184 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:24,186 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:24,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:53:24,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,195 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:24,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:24,199 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:24,199 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:24,200 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:24,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:24,203 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:53:24,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,216 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:53:24,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:24,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:53:24,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,255 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:24,256 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:24,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:24,265 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:24,266 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:24,270 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:24,272 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:24,273 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:24,831 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:24,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:24,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 54 [2021-11-19 15:53:24,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894591215] [2021-11-19 15:53:24,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:24,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-19 15:53:24,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:24,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-19 15:53:24,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1381, Invalid=2651, Unknown=0, NotChecked=0, Total=4032 [2021-11-19 15:53:24,833 INFO L87 Difference]: Start difference. First operand 295 states and 297 transitions. Second operand has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 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) [2021-11-19 15:53:25,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:25,898 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2021-11-19 15:53:25,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-19 15:53:25,899 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 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 294 [2021-11-19 15:53:25,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:25,900 INFO L225 Difference]: With dead ends: 312 [2021-11-19 15:53:25,900 INFO L226 Difference]: Without dead ends: 310 [2021-11-19 15:53:25,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1029 GetRequests, 915 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3616 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=4140, Invalid=8970, Unknown=0, NotChecked=0, Total=13110 [2021-11-19 15:53:25,901 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 212 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:25,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 452 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:53:25,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-19 15:53:25,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 303. [2021-11-19 15:53:25,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 1.009933774834437) internal successors, (305), 302 states have internal predecessors, (305), 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) [2021-11-19 15:53:25,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 305 transitions. [2021-11-19 15:53:25,928 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 305 transitions. Word has length 294 [2021-11-19 15:53:25,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:25,928 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 305 transitions. [2021-11-19 15:53:25,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 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) [2021-11-19 15:53:25,929 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 305 transitions. [2021-11-19 15:53:25,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-19 15:53:25,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:25,930 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:25,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:26,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1478 [2021-11-19 15:53:26,134 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:26,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:26,134 INFO L85 PathProgramCache]: Analyzing trace with hash 280122915, now seen corresponding path program 61 times [2021-11-19 15:53:26,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:26,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027359797] [2021-11-19 15:53:26,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:26,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:26,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:29,110 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4658 proven. 2496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:29,110 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:53:29,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027359797] [2021-11-19 15:53:29,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027359797] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:53:29,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487587907] [2021-11-19 15:53:29,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:53:29,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:29,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:53:29,112 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:53:29,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-19 15:53:29,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:29,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 1115 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-19 15:53:29,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:33,883 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:53:33,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:53:34,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487587907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:34,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1701012774] [2021-11-19 15:53:34,643 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:34,643 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:34,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:34,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:34,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:34,648 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:34,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:34,650 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,652 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:34,653 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:34,654 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:34,656 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:34,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:53:34,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,668 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:34,670 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:34,673 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:34,674 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:34,674 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,679 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:34,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:34,681 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,683 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:34,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,692 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,694 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:53:34,696 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:34,698 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:53:34,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,711 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:34,713 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:34,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:34,722 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:34,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:34,728 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:34,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:34,732 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:35,807 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:35,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:35,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 100, 100] total 152 [2021-11-19 15:53:35,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921534322] [2021-11-19 15:53:35,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:35,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-19 15:53:35,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:35,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-19 15:53:35,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5280, Invalid=20480, Unknown=0, NotChecked=0, Total=25760 [2021-11-19 15:53:35,813 INFO L87 Difference]: Start difference. First operand 303 states and 305 transitions. Second operand has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 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) [2021-11-19 15:53:38,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:38,701 INFO L93 Difference]: Finished difference Result 653 states and 705 transitions. [2021-11-19 15:53:38,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-19 15:53:38,702 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 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 302 [2021-11-19 15:53:38,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:38,705 INFO L225 Difference]: With dead ends: 653 [2021-11-19 15:53:38,705 INFO L226 Difference]: Without dead ends: 452 [2021-11-19 15:53:38,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1054 GetRequests, 846 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10648 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=10182, Invalid=33708, Unknown=0, NotChecked=0, Total=43890 [2021-11-19 15:53:38,708 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 525 mSDsluCounter, 1135 mSDsCounter, 0 mSdLazyCounter, 1285 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 1235 SdHoareTripleChecker+Invalid, 1678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 1285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:38,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [525 Valid, 1235 Invalid, 1678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 1285 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:53:38,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-19 15:53:38,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 305. [2021-11-19 15:53:38,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0098684210526316) internal successors, (307), 304 states have internal predecessors, (307), 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) [2021-11-19 15:53:38,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 307 transitions. [2021-11-19 15:53:38,747 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 307 transitions. Word has length 302 [2021-11-19 15:53:38,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:38,747 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 307 transitions. [2021-11-19 15:53:38,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 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) [2021-11-19 15:53:38,748 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 307 transitions. [2021-11-19 15:53:38,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-19 15:53:38,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:38,750 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:38,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:38,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1503,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:38,951 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:38,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:38,951 INFO L85 PathProgramCache]: Analyzing trace with hash -886635832, now seen corresponding path program 62 times [2021-11-19 15:53:38,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:38,951 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061899036] [2021-11-19 15:53:38,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:38,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:39,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:42,163 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4658 proven. 2594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:42,163 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:53:42,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061899036] [2021-11-19 15:53:42,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061899036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:53:42,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388510608] [2021-11-19 15:53:42,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:53:42,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:42,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:53:42,164 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:53:42,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-19 15:53:42,442 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2021-11-19 15:53:42,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:53:42,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-19 15:53:42,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:46,976 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:46,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:47,711 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:47,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388510608] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:47,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133638005] [2021-11-19 15:53:47,713 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:47,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:47,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:47,713 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:47,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:47,726 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:47,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:47,730 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,732 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:47,732 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,734 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:47,735 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:47,737 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:47,740 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:53:47,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,753 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:47,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:47,760 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:47,762 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:47,762 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:47,765 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:47,767 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:47,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:53:47,787 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:47,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:53:47,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,809 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:47,811 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:47,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:47,823 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:47,825 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:47,830 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:47,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:47,834 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:48,862 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:48,862 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:48,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 154 [2021-11-19 15:53:48,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265780764] [2021-11-19 15:53:48,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:48,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-19 15:53:48,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:48,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-19 15:53:48,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5435, Invalid=20971, Unknown=0, NotChecked=0, Total=26406 [2021-11-19 15:53:48,866 INFO L87 Difference]: Start difference. First operand 305 states and 307 transitions. Second operand has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 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) [2021-11-19 15:53:52,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:52,010 INFO L93 Difference]: Finished difference Result 660 states and 713 transitions. [2021-11-19 15:53:52,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-19 15:53:52,013 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 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 304 [2021-11-19 15:53:52,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:52,016 INFO L225 Difference]: With dead ends: 660 [2021-11-19 15:53:52,016 INFO L226 Difference]: Without dead ends: 457 [2021-11-19 15:53:52,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 851 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10881 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=10537, Invalid=34619, Unknown=0, NotChecked=0, Total=45156 [2021-11-19 15:53:52,021 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 523 mSDsluCounter, 1125 mSDsCounter, 0 mSdLazyCounter, 1292 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 1227 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 1292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:52,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [523 Valid, 1227 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [546 Valid, 1292 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:53:52,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-19 15:53:52,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 307. [2021-11-19 15:53:52,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.0098039215686274) internal successors, (309), 306 states have internal predecessors, (309), 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) [2021-11-19 15:53:52,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 309 transitions. [2021-11-19 15:53:52,069 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 309 transitions. Word has length 304 [2021-11-19 15:53:52,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:52,070 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 309 transitions. [2021-11-19 15:53:52,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 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) [2021-11-19 15:53:52,070 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 309 transitions. [2021-11-19 15:53:52,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-19 15:53:52,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:52,072 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:52,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:52,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1528,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:52,297 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:52,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:52,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1155327443, now seen corresponding path program 63 times [2021-11-19 15:53:52,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:52,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649990530] [2021-11-19 15:53:52,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:52,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:52,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:53:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2450 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:53,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:53:53,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649990530] [2021-11-19 15:53:53,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649990530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:53:53,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212528397] [2021-11-19 15:53:53,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:53:53,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:53:53,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:53:53,884 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:53:53,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-19 15:53:54,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:53:54,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:53:54,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 1135 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-19 15:53:54,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:53:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:54,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:53:55,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:53:55,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212528397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:53:55,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1895323587] [2021-11-19 15:53:55,391 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:53:55,392 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:53:55,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:53:55,392 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:53:55,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:53:55,401 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:53:55,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:55,404 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,406 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:55,407 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:53:55,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:53:55,411 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:53:55,413 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:53:55,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,421 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:53:55,423 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:53:55,426 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:53:55,426 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:53:55,427 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:53:55,428 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:53:55,430 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:53:55,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:53:55,443 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:53:55,444 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:53:55,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,455 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:53:55,457 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:53:55,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:53:55,464 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:55,465 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:55,468 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:53:55,470 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:53:55,471 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:53:56,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:53:56,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:53:56,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 56 [2021-11-19 15:53:56,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819094526] [2021-11-19 15:53:56,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:53:56,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-19 15:53:56,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:53:56,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-19 15:53:56,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1486, Invalid=2804, Unknown=0, NotChecked=0, Total=4290 [2021-11-19 15:53:56,006 INFO L87 Difference]: Start difference. First operand 307 states and 309 transitions. Second operand has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 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) [2021-11-19 15:53:57,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:53:57,224 INFO L93 Difference]: Finished difference Result 324 states and 327 transitions. [2021-11-19 15:53:57,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-19 15:53:57,225 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 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 306 [2021-11-19 15:53:57,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:53:57,226 INFO L225 Difference]: With dead ends: 324 [2021-11-19 15:53:57,226 INFO L226 Difference]: Without dead ends: 322 [2021-11-19 15:53:57,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1071 GetRequests, 953 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3864 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=4459, Invalid=9583, Unknown=0, NotChecked=0, Total=14042 [2021-11-19 15:53:57,228 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 219 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:53:57,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 449 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:53:57,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-19 15:53:57,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 315. [2021-11-19 15:53:57,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 1.0095541401273886) internal successors, (317), 314 states have internal predecessors, (317), 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) [2021-11-19 15:53:57,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 317 transitions. [2021-11-19 15:53:57,256 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 317 transitions. Word has length 306 [2021-11-19 15:53:57,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:53:57,256 INFO L470 AbstractCegarLoop]: Abstraction has 315 states and 317 transitions. [2021-11-19 15:53:57,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 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) [2021-11-19 15:53:57,256 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 317 transitions. [2021-11-19 15:53:57,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-19 15:53:57,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:53:57,257 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:53:57,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-19 15:53:57,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1553 [2021-11-19 15:53:57,458 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:53:57,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:53:57,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1791168749, now seen corresponding path program 64 times [2021-11-19 15:53:57,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:53:57,459 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407180314] [2021-11-19 15:53:57,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:53:57,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:53:57,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:00,679 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5052 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:00,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:54:00,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407180314] [2021-11-19 15:54:00,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407180314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:54:00,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553758785] [2021-11-19 15:54:00,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:54:00,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:00,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:54:00,680 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:54:00,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-19 15:54:00,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:00,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-19 15:54:00,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:54:05,766 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:54:05,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:54:06,495 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:54:06,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553758785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:54:06,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1767175425] [2021-11-19 15:54:06,497 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:54:06,497 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:54:06,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:54:06,497 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:54:06,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:54:06,501 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:54:06,502 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:06,503 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,504 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:06,504 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:54:06,506 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:54:06,507 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:54:06,509 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:54:06,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,516 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:54:06,518 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:54:06,521 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:54:06,525 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:06,525 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,526 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:54:06,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:54:06,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,536 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:54:06,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,543 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,545 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:54:06,546 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:06,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:54:06,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,559 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:54:06,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:06,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:06,604 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:06,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:06,611 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:06,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:06,615 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:54:07,763 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:54:07,763 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:54:07,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 104, 104] total 158 [2021-11-19 15:54:07,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149416735] [2021-11-19 15:54:07,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:54:07,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2021-11-19 15:54:07,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:54:07,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-11-19 15:54:07,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5698, Invalid=22024, Unknown=0, NotChecked=0, Total=27722 [2021-11-19 15:54:07,767 INFO L87 Difference]: Start difference. First operand 315 states and 317 transitions. Second operand has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 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) [2021-11-19 15:54:10,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:54:10,695 INFO L93 Difference]: Finished difference Result 679 states and 733 transitions. [2021-11-19 15:54:10,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-19 15:54:10,696 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 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 314 [2021-11-19 15:54:10,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:54:10,698 INFO L225 Difference]: With dead ends: 679 [2021-11-19 15:54:10,698 INFO L226 Difference]: Without dead ends: 470 [2021-11-19 15:54:10,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1096 GetRequests, 880 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11439 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=11004, Invalid=36302, Unknown=0, NotChecked=0, Total=47306 [2021-11-19 15:54:10,703 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 532 mSDsluCounter, 1169 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 348 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 1273 SdHoareTripleChecker+Invalid, 1685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 348 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 15:54:10,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [532 Valid, 1273 Invalid, 1685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [348 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 15:54:10,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-11-19 15:54:10,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 317. [2021-11-19 15:54:10,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.009493670886076) internal successors, (319), 316 states have internal predecessors, (319), 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) [2021-11-19 15:54:10,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 319 transitions. [2021-11-19 15:54:10,740 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 319 transitions. Word has length 314 [2021-11-19 15:54:10,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:54:10,740 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 319 transitions. [2021-11-19 15:54:10,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 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) [2021-11-19 15:54:10,741 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 319 transitions. [2021-11-19 15:54:10,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-11-19 15:54:10,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:54:10,742 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:54:10,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-19 15:54:10,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1578 [2021-11-19 15:54:10,943 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:54:10,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:54:10,943 INFO L85 PathProgramCache]: Analyzing trace with hash 75680824, now seen corresponding path program 65 times [2021-11-19 15:54:10,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:54:10,943 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954698502] [2021-11-19 15:54:10,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:54:10,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:54:11,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:13,920 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5052 proven. 2802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:13,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:54:13,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954698502] [2021-11-19 15:54:13,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954698502] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:54:13,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279391930] [2021-11-19 15:54:13,921 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:54:13,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:13,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:54:13,921 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:54:13,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-19 15:54:14,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-19 15:54:14,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:54:14,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-19 15:54:14,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:54:18,513 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:18,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:54:19,161 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:19,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279391930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:54:19,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1352922059] [2021-11-19 15:54:19,162 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:54:19,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:54:19,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:54:19,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:54:19,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:54:19,169 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:54:19,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:19,171 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,172 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:19,173 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:54:19,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:54:19,176 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:54:19,178 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:54:19,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,186 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:54:19,187 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:54:19,190 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:54:19,191 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:19,191 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:54:19,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:54:19,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:54:19,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,204 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:54:19,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:19,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:54:19,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,220 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:54:19,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:19,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:19,229 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:19,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:19,234 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:19,236 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:19,237 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:54:20,226 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:54:20,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:54:20,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 160 [2021-11-19 15:54:20,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286973713] [2021-11-19 15:54:20,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:54:20,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2021-11-19 15:54:20,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:54:20,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2021-11-19 15:54:20,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5859, Invalid=22533, Unknown=0, NotChecked=0, Total=28392 [2021-11-19 15:54:20,230 INFO L87 Difference]: Start difference. First operand 317 states and 319 transitions. Second operand has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 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) [2021-11-19 15:54:23,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:54:23,068 INFO L93 Difference]: Finished difference Result 686 states and 741 transitions. [2021-11-19 15:54:23,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-19 15:54:23,069 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 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 316 [2021-11-19 15:54:23,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:54:23,071 INFO L225 Difference]: With dead ends: 686 [2021-11-19 15:54:23,071 INFO L226 Difference]: Without dead ends: 475 [2021-11-19 15:54:23,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1104 GetRequests, 885 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11680 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=11373, Invalid=37247, Unknown=0, NotChecked=0, Total=48620 [2021-11-19 15:54:23,074 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 607 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 1280 mSolverCounterSat, 545 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 1223 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 545 IncrementalHoareTripleChecker+Valid, 1280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 15:54:23,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [607 Valid, 1223 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [545 Valid, 1280 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 15:54:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-19 15:54:23,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 319. [2021-11-19 15:54:23,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.009433962264151) internal successors, (321), 318 states have internal predecessors, (321), 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) [2021-11-19 15:54:23,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 321 transitions. [2021-11-19 15:54:23,105 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 321 transitions. Word has length 316 [2021-11-19 15:54:23,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:54:23,105 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 321 transitions. [2021-11-19 15:54:23,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 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) [2021-11-19 15:54:23,105 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 321 transitions. [2021-11-19 15:54:23,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2021-11-19 15:54:23,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:54:23,107 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:54:23,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-19 15:54:23,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1603,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:23,328 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:54:23,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:54:23,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1178209251, now seen corresponding path program 66 times [2021-11-19 15:54:23,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:54:23,329 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137279358] [2021-11-19 15:54:23,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:54:23,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:54:23,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:24,844 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2652 proven. 5306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:24,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:54:24,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137279358] [2021-11-19 15:54:24,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137279358] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:54:24,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251391072] [2021-11-19 15:54:24,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:54:24,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:24,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:54:24,846 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:54:24,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-19 15:54:25,009 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:54:25,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:54:25,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1179 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-19 15:54:25,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:54:25,639 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:25,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:54:26,243 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:26,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251391072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:54:26,244 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840214537] [2021-11-19 15:54:26,244 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:54:26,244 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:54:26,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:54:26,245 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:54:26,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:54:26,253 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:54:26,254 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:26,255 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,257 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:26,257 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:54:26,258 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:54:26,260 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:54:26,262 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:54:26,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,275 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:54:26,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:54:26,279 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:54:26,280 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:26,280 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:54:26,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:54:26,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:26,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,289 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,292 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:54:26,295 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:26,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:54:26,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,306 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:54:26,307 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:26,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:26,314 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:26,315 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:26,318 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:26,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:26,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:54:26,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:54:26,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:54:26,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 58 [2021-11-19 15:54:26,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637140724] [2021-11-19 15:54:26,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:54:26,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-19 15:54:26,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:54:26,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-19 15:54:26,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2021-11-19 15:54:26,843 INFO L87 Difference]: Start difference. First operand 319 states and 321 transitions. Second operand has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 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) [2021-11-19 15:54:28,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:54:28,048 INFO L93 Difference]: Finished difference Result 336 states and 339 transitions. [2021-11-19 15:54:28,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-19 15:54:28,048 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 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 318 [2021-11-19 15:54:28,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:54:28,050 INFO L225 Difference]: With dead ends: 336 [2021-11-19 15:54:28,050 INFO L226 Difference]: Without dead ends: 334 [2021-11-19 15:54:28,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1113 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=4790, Invalid=10216, Unknown=0, NotChecked=0, Total=15006 [2021-11-19 15:54:28,051 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 279 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 485 SdHoareTripleChecker+Invalid, 783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:54:28,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 485 Invalid, 783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:54:28,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-19 15:54:28,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 327. [2021-11-19 15:54:28,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 1.00920245398773) internal successors, (329), 326 states have internal predecessors, (329), 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) [2021-11-19 15:54:28,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2021-11-19 15:54:28,081 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 318 [2021-11-19 15:54:28,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:54:28,081 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2021-11-19 15:54:28,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 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) [2021-11-19 15:54:28,081 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2021-11-19 15:54:28,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-19 15:54:28,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:54:28,082 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:54:28,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-19 15:54:28,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1628,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:28,283 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:54:28,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:54:28,283 INFO L85 PathProgramCache]: Analyzing trace with hash -736175869, now seen corresponding path program 67 times [2021-11-19 15:54:28,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:54:28,284 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704766980] [2021-11-19 15:54:28,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:54:28,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:54:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5462 proven. 2912 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:31,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:54:31,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704766980] [2021-11-19 15:54:31,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704766980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:54:31,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146442877] [2021-11-19 15:54:31,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:54:31,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:31,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:54:31,380 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:54:31,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-19 15:54:31,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:31,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 1203 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-19 15:54:31,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:54:36,166 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:54:36,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:54:36,803 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:54:36,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146442877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:54:36,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1678938204] [2021-11-19 15:54:36,805 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:54:36,805 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:54:36,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:54:36,805 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:54:36,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:54:36,808 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:54:36,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:36,811 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,812 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:36,812 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,813 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:54:36,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:54:36,815 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:54:36,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:54:36,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,824 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:54:36,826 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:54:36,828 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:54:36,829 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:36,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:54:36,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:54:36,833 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:36,835 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,844 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:54:36,845 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:36,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:54:36,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,859 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:54:36,860 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:36,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:36,868 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:36,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:36,873 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:36,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:36,876 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:54:37,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:54:37,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:54:37,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 108, 108] total 164 [2021-11-19 15:54:37,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411203075] [2021-11-19 15:54:37,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:54:37,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2021-11-19 15:54:37,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:54:37,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-11-19 15:54:37,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6132, Invalid=23624, Unknown=0, NotChecked=0, Total=29756 [2021-11-19 15:54:37,908 INFO L87 Difference]: Start difference. First operand 327 states and 329 transitions. Second operand has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 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) [2021-11-19 15:54:41,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:54:41,162 INFO L93 Difference]: Finished difference Result 705 states and 761 transitions. [2021-11-19 15:54:41,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-19 15:54:41,163 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 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 326 [2021-11-19 15:54:41,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:54:41,165 INFO L225 Difference]: With dead ends: 705 [2021-11-19 15:54:41,165 INFO L226 Difference]: Without dead ends: 488 [2021-11-19 15:54:41,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1138 GetRequests, 914 SyntacticMatches, 0 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12258 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=11858, Invalid=38992, Unknown=0, NotChecked=0, Total=50850 [2021-11-19 15:54:41,168 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 575 mSDsluCounter, 1106 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 641 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 1915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 641 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:54:41,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [575 Valid, 1214 Invalid, 1915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [641 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:54:41,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-19 15:54:41,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 329. [2021-11-19 15:54:41,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 1.0091463414634145) internal successors, (331), 328 states have internal predecessors, (331), 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) [2021-11-19 15:54:41,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 331 transitions. [2021-11-19 15:54:41,199 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 331 transitions. Word has length 326 [2021-11-19 15:54:41,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:54:41,199 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 331 transitions. [2021-11-19 15:54:41,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 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) [2021-11-19 15:54:41,199 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 331 transitions. [2021-11-19 15:54:41,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-19 15:54:41,201 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:54:41,201 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:54:41,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-19 15:54:41,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1653 [2021-11-19 15:54:41,401 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:54:41,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:54:41,402 INFO L85 PathProgramCache]: Analyzing trace with hash 426845864, now seen corresponding path program 68 times [2021-11-19 15:54:41,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:54:41,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998585669] [2021-11-19 15:54:41,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:54:41,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:54:41,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:54:44,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 5462 proven. 3018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:44,537 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:54:44,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998585669] [2021-11-19 15:54:44,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998585669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:54:44,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930085345] [2021-11-19 15:54:44,538 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:54:44,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:54:44,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:54:44,538 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:54:44,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-19 15:54:44,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2021-11-19 15:54:44,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:54:44,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 1213 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-19 15:54:44,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:54:48,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:48,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:54:49,066 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:54:49,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930085345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:54:49,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752581851] [2021-11-19 15:54:49,067 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:54:49,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:54:49,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:54:49,067 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:54:49,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:54:49,070 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:54:49,071 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:54:49,073 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,074 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:49,074 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,075 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:54:49,076 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:54:49,077 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:54:49,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:54:49,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,086 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:54:49,088 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:54:49,090 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:54:49,091 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:54:49,091 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:54:49,092 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:54:49,094 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,096 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:54:49,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,103 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:54:49,106 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:54:49,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:54:49,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,117 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:54:49,119 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:54:49,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:54:49,131 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:49,133 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:49,138 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:54:49,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:54:49,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:54:50,259 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:54:50,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:54:50,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [110, 56, 56] total 165 [2021-11-19 15:54:50,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175285320] [2021-11-19 15:54:50,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:54:50,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2021-11-19 15:54:50,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:54:50,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2021-11-19 15:54:50,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4708, Invalid=25394, Unknown=0, NotChecked=0, Total=30102 [2021-11-19 15:54:50,266 INFO L87 Difference]: Start difference. First operand 329 states and 331 transitions. Second operand has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 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) [2021-11-19 15:54:59,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:54:59,062 INFO L93 Difference]: Finished difference Result 719 states and 777 transitions. [2021-11-19 15:54:59,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 221 states. [2021-11-19 15:54:59,063 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 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 328 [2021-11-19 15:54:59,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:54:59,065 INFO L225 Difference]: With dead ends: 719 [2021-11-19 15:54:59,065 INFO L226 Difference]: Without dead ends: 500 [2021-11-19 15:54:59,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1362 GetRequests, 973 SyntacticMatches, 1 SemanticMatches, 388 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52819 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=23071, Invalid=128639, Unknown=0, NotChecked=0, Total=151710 [2021-11-19 15:54:59,071 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 1064 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 3889 mSolverCounterSat, 1025 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1064 SdHoareTripleChecker+Valid, 886 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1025 IncrementalHoareTripleChecker+Valid, 3889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:54:59,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1064 Valid, 886 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1025 Valid, 3889 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-19 15:54:59,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2021-11-19 15:54:59,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 335. [2021-11-19 15:54:59,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 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) [2021-11-19 15:54:59,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2021-11-19 15:54:59,105 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 328 [2021-11-19 15:54:59,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:54:59,105 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2021-11-19 15:54:59,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 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) [2021-11-19 15:54:59,106 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2021-11-19 15:54:59,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2021-11-19 15:54:59,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:54:59,107 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:54:59,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-19 15:54:59,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1678 [2021-11-19 15:54:59,308 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:54:59,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:54:59,308 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 69 times [2021-11-19 15:54:59,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:54:59,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998952444] [2021-11-19 15:54:59,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:54:59,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:54:59,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:02,618 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:02,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:55:02,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998952444] [2021-11-19 15:55:02,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998952444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:55:02,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507588164] [2021-11-19 15:55:02,619 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:55:02,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:02,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:55:02,619 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:55:02,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-19 15:55:02,782 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:55:02,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:55:02,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-19 15:55:02,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:55:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:06,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:55:07,335 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:07,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507588164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:55:07,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1087362974] [2021-11-19 15:55:07,336 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:55:07,337 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:55:07,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:55:07,337 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:55:07,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:55:07,343 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:55:07,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:07,348 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,349 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:07,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:55:07,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:55:07,353 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:55:07,361 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:55:07,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,369 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:55:07,371 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:55:07,374 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:55:07,375 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:07,376 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,377 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:55:07,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:55:07,379 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,381 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:07,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,390 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,391 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:55:07,393 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:07,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:55:07,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,415 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:55:07,416 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:07,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:07,423 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:07,425 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:07,428 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:07,430 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:07,434 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:55:08,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:55:08,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:55:08,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 57, 57] total 168 [2021-11-19 15:55:08,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904051751] [2021-11-19 15:55:08,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:55:08,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2021-11-19 15:55:08,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:55:08,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2021-11-19 15:55:08,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4877, Invalid=26275, Unknown=0, NotChecked=0, Total=31152 [2021-11-19 15:55:08,479 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 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) [2021-11-19 15:55:17,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:55:17,060 INFO L93 Difference]: Finished difference Result 732 states and 791 transitions. [2021-11-19 15:55:17,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 225 states. [2021-11-19 15:55:17,060 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 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 334 [2021-11-19 15:55:17,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:55:17,062 INFO L225 Difference]: With dead ends: 732 [2021-11-19 15:55:17,062 INFO L226 Difference]: Without dead ends: 509 [2021-11-19 15:55:17,070 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 395 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54760 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=23910, Invalid=133302, Unknown=0, NotChecked=0, Total=157212 [2021-11-19 15:55:17,070 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 1142 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 3461 mSolverCounterSat, 1254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1142 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 4715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1254 IncrementalHoareTripleChecker+Valid, 3461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:55:17,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1142 Valid, 777 Invalid, 4715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1254 Valid, 3461 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-19 15:55:17,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-19 15:55:17,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 341. [2021-11-19 15:55:17,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.0088235294117647) internal successors, (343), 340 states have internal predecessors, (343), 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) [2021-11-19 15:55:17,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 343 transitions. [2021-11-19 15:55:17,105 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 343 transitions. Word has length 334 [2021-11-19 15:55:17,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:55:17,105 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 343 transitions. [2021-11-19 15:55:17,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 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) [2021-11-19 15:55:17,106 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 343 transitions. [2021-11-19 15:55:17,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2021-11-19 15:55:17,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:55:17,107 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:55:17,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-19 15:55:17,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1703 [2021-11-19 15:55:17,308 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:55:17,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:55:17,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1029149208, now seen corresponding path program 70 times [2021-11-19 15:55:17,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:55:17,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960626360] [2021-11-19 15:55:17,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:55:17,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:55:17,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:20,838 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 5888 proven. 3242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:20,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:55:20,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960626360] [2021-11-19 15:55:20,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960626360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:55:20,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622274844] [2021-11-19 15:55:20,839 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:55:20,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:20,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:55:20,840 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:55:20,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-19 15:55:20,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:21,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1257 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-19 15:55:21,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:55:26,310 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:26,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:55:27,118 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:27,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622274844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:55:27,118 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008583186] [2021-11-19 15:55:27,119 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:55:27,119 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:55:27,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:55:27,120 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:55:27,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:55:27,124 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:55:27,125 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:27,143 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,145 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:27,146 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:55:27,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:55:27,151 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:55:27,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:55:27,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,167 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:55:27,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:55:27,174 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:55:27,175 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:27,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:55:27,177 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:55:27,179 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,181 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:55:27,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,190 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,192 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:55:27,193 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:27,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:55:27,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,220 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:55:27,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:27,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:27,230 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:27,232 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:27,236 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:27,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:27,239 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:55:28,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:55:28,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:55:28,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 172 [2021-11-19 15:55:28,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345493825] [2021-11-19 15:55:28,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:55:28,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-19 15:55:28,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:55:28,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-19 15:55:28,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6755, Invalid=25825, Unknown=0, NotChecked=0, Total=32580 [2021-11-19 15:55:28,443 INFO L87 Difference]: Start difference. First operand 341 states and 343 transitions. Second operand has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 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) [2021-11-19 15:55:31,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:55:31,607 INFO L93 Difference]: Finished difference Result 738 states and 797 transitions. [2021-11-19 15:55:31,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-19 15:55:31,608 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 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 340 [2021-11-19 15:55:31,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:55:31,610 INFO L225 Difference]: With dead ends: 738 [2021-11-19 15:55:31,610 INFO L226 Difference]: Without dead ends: 511 [2021-11-19 15:55:31,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1188 GetRequests, 953 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13362 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=13141, Invalid=42791, Unknown=0, NotChecked=0, Total=55932 [2021-11-19 15:55:31,613 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 599 mSDsluCounter, 1226 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 2070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 675 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:55:31,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 1340 Invalid, 2070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [675 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:55:31,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-19 15:55:31,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 343. [2021-11-19 15:55:31,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 342 states have (on average 1.0087719298245614) internal successors, (345), 342 states have internal predecessors, (345), 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) [2021-11-19 15:55:31,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 345 transitions. [2021-11-19 15:55:31,647 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 345 transitions. Word has length 340 [2021-11-19 15:55:31,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:55:31,648 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 345 transitions. [2021-11-19 15:55:31,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 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) [2021-11-19 15:55:31,648 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 345 transitions. [2021-11-19 15:55:31,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2021-11-19 15:55:31,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:55:31,649 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:55:31,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-19 15:55:31,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1728,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:31,850 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:55:31,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:55:31,850 INFO L85 PathProgramCache]: Analyzing trace with hash -1265984771, now seen corresponding path program 71 times [2021-11-19 15:55:31,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:55:31,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528046170] [2021-11-19 15:55:31,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:55:31,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:55:31,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:33,270 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3080 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:33,270 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:55:33,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528046170] [2021-11-19 15:55:33,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528046170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:55:33,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731286770] [2021-11-19 15:55:33,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:55:33,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:33,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:55:33,271 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:55:33,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-19 15:55:33,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2021-11-19 15:55:33,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:55:33,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 1267 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-19 15:55:33,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:55:34,337 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:34,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:55:35,124 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:35,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731286770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:55:35,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710725813] [2021-11-19 15:55:35,125 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:55:35,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:55:35,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:55:35,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:55:35,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:55:35,129 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:55:35,130 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:35,132 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,133 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:35,134 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:55:35,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:55:35,137 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:55:35,139 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:55:35,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,147 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:55:35,149 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:55:35,152 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:55:35,153 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:35,153 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:55:35,155 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:55:35,157 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:55:35,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,167 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,169 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:55:35,170 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:35,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:55:35,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,185 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:55:35,186 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:35,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:35,194 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:35,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:35,200 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:35,202 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:35,203 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:55:35,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:55:35,772 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:55:35,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 62 [2021-11-19 15:55:35,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825423463] [2021-11-19 15:55:35,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:55:35,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-19 15:55:35,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:55:35,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-19 15:55:35,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1825, Invalid=3287, Unknown=0, NotChecked=0, Total=5112 [2021-11-19 15:55:35,775 INFO L87 Difference]: Start difference. First operand 343 states and 345 transitions. Second operand has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 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) [2021-11-19 15:55:37,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:55:37,156 INFO L93 Difference]: Finished difference Result 360 states and 363 transitions. [2021-11-19 15:55:37,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-19 15:55:37,156 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 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 342 [2021-11-19 15:55:37,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:55:37,158 INFO L225 Difference]: With dead ends: 360 [2021-11-19 15:55:37,158 INFO L226 Difference]: Without dead ends: 358 [2021-11-19 15:55:37,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1067 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5488, Invalid=11542, Unknown=0, NotChecked=0, Total=17030 [2021-11-19 15:55:37,159 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 243 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:55:37,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 512 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:55:37,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-19 15:55:37,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 351. [2021-11-19 15:55:37,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 350 states have (on average 1.0085714285714287) internal successors, (353), 350 states have internal predecessors, (353), 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) [2021-11-19 15:55:37,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 353 transitions. [2021-11-19 15:55:37,195 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 353 transitions. Word has length 342 [2021-11-19 15:55:37,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:55:37,195 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 353 transitions. [2021-11-19 15:55:37,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 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) [2021-11-19 15:55:37,196 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 353 transitions. [2021-11-19 15:55:37,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-19 15:55:37,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:55:37,197 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:55:37,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-19 15:55:37,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1753 [2021-11-19 15:55:37,398 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:55:37,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:55:37,398 INFO L85 PathProgramCache]: Analyzing trace with hash -423714845, now seen corresponding path program 72 times [2021-11-19 15:55:37,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:55:37,398 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708647078] [2021-11-19 15:55:37,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:55:37,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:55:37,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6330 proven. 3360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:41,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:55:41,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708647078] [2021-11-19 15:55:41,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708647078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:55:41,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091082551] [2021-11-19 15:55:41,214 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:55:41,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:41,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:55:41,214 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:55:41,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-19 15:55:41,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:55:41,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:55:41,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 1291 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-19 15:55:41,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:55:46,969 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:46,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:55:47,731 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:47,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091082551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:55:47,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641777577] [2021-11-19 15:55:47,733 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:55:47,733 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:55:47,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:55:47,733 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:55:47,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:55:47,736 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:55:47,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:47,739 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,740 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:47,741 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:55:47,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:55:47,744 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:55:47,745 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:55:47,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,753 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:55:47,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:55:47,757 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:55:47,757 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:47,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:55:47,759 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:55:47,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,762 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:47,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,770 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:55:47,771 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:47,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:55:47,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,789 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:55:47,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:47,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:47,797 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:47,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:47,801 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:47,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:47,804 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:55:48,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:55:48,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:55:48,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 179 [2021-11-19 15:55:48,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952968924] [2021-11-19 15:55:48,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:55:48,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2021-11-19 15:55:48,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:55:48,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2021-11-19 15:55:48,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7346, Invalid=27810, Unknown=0, NotChecked=0, Total=35156 [2021-11-19 15:55:48,822 INFO L87 Difference]: Start difference. First operand 351 states and 353 transitions. Second operand has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 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) [2021-11-19 15:55:54,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:55:54,783 INFO L93 Difference]: Finished difference Result 991 states and 1053 transitions. [2021-11-19 15:55:54,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-11-19 15:55:54,784 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 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 350 [2021-11-19 15:55:54,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:55:54,786 INFO L225 Difference]: With dead ends: 991 [2021-11-19 15:55:54,786 INFO L226 Difference]: Without dead ends: 529 [2021-11-19 15:55:54,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1280 GetRequests, 979 SyntacticMatches, 0 SemanticMatches, 301 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23196 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=20975, Invalid=70531, Unknown=0, NotChecked=0, Total=91506 [2021-11-19 15:55:54,790 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 758 mSDsluCounter, 1665 mSDsCounter, 0 mSdLazyCounter, 1843 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 758 SdHoareTripleChecker+Valid, 1781 SdHoareTripleChecker+Invalid, 2345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 1843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:55:54,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [758 Valid, 1781 Invalid, 2345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 1843 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 15:55:54,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-11-19 15:55:54,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 355. [2021-11-19 15:55:54,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 1.0084745762711864) internal successors, (357), 354 states have internal predecessors, (357), 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) [2021-11-19 15:55:54,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 357 transitions. [2021-11-19 15:55:54,826 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 357 transitions. Word has length 350 [2021-11-19 15:55:54,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:55:54,826 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 357 transitions. [2021-11-19 15:55:54,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 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) [2021-11-19 15:55:54,826 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 357 transitions. [2021-11-19 15:55:54,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-19 15:55:54,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:55:54,828 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:55:54,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-19 15:55:55,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1778,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:55,028 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:55:55,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:55:55,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1182230509, now seen corresponding path program 73 times [2021-11-19 15:55:55,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:55:55,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261537873] [2021-11-19 15:55:55,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:55:55,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:55:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:56,625 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3306 proven. 6614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:56,626 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:55:56,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261537873] [2021-11-19 15:55:56,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261537873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:55:56,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875784388] [2021-11-19 15:55:56,626 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:55:56,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:55:56,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:55:56,627 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:55:56,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-19 15:55:56,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:55:56,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 1311 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-19 15:55:56,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:55:57,519 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:57,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:55:58,264 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:55:58,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875784388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:55:58,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343501436] [2021-11-19 15:55:58,265 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:55:58,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:55:58,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:55:58,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:55:58,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:55:58,268 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:55:58,269 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:55:58,271 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,272 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:58,272 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:55:58,273 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:55:58,275 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:55:58,276 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:55:58,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,283 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:55:58,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:55:58,287 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:55:58,288 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:55:58,288 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:55:58,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:55:58,291 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,292 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:55:58,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,300 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:55:58,302 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:55:58,303 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:55:58,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,313 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:55:58,314 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:55:58,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:55:58,321 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:58,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:58,325 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:55:58,327 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:55:58,328 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:55:58,880 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:55:58,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:55:58,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 64 [2021-11-19 15:55:58,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14720190] [2021-11-19 15:55:58,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:55:58,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-19 15:55:58,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:55:58,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-19 15:55:58,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1946, Invalid=3456, Unknown=0, NotChecked=0, Total=5402 [2021-11-19 15:55:58,883 INFO L87 Difference]: Start difference. First operand 355 states and 357 transitions. Second operand has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 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) [2021-11-19 15:56:00,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:56:00,539 INFO L93 Difference]: Finished difference Result 372 states and 375 transitions. [2021-11-19 15:56:00,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-19 15:56:00,539 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 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 354 [2021-11-19 15:56:00,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:56:00,541 INFO L225 Difference]: With dead ends: 372 [2021-11-19 15:56:00,541 INFO L226 Difference]: Without dead ends: 370 [2021-11-19 15:56:00,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1239 GetRequests, 1105 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4936 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=5855, Invalid=12235, Unknown=0, NotChecked=0, Total=18090 [2021-11-19 15:56:00,543 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 373 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:56:00,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 457 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:56:00,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-19 15:56:00,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 363. [2021-11-19 15:56:00,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 362 states have (on average 1.0082872928176796) internal successors, (365), 362 states have internal predecessors, (365), 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) [2021-11-19 15:56:00,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 365 transitions. [2021-11-19 15:56:00,591 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 365 transitions. Word has length 354 [2021-11-19 15:56:00,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:56:00,591 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 365 transitions. [2021-11-19 15:56:00,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 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) [2021-11-19 15:56:00,591 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 365 transitions. [2021-11-19 15:56:00,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-19 15:56:00,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:56:00,593 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:56:00,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-19 15:56:00,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1803,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:00,794 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:56:00,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:56:00,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1430748371, now seen corresponding path program 74 times [2021-11-19 15:56:00,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:56:00,795 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161364367] [2021-11-19 15:56:00,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:56:00,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:56:00,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:56:04,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6788 proven. 3596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:04,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:56:04,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161364367] [2021-11-19 15:56:04,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161364367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:56:04,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790976105] [2021-11-19 15:56:04,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:56:04,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:04,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:56:04,783 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:56:04,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-19 15:56:05,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2021-11-19 15:56:05,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:56:05,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 1335 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-19 15:56:05,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:56:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:10,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:56:11,566 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:11,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790976105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:56:11,566 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [920873362] [2021-11-19 15:56:11,567 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:56:11,567 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:56:11,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:56:11,567 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:56:11,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:56:11,570 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:56:11,571 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:56:11,573 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,574 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:11,574 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,575 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:56:11,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:56:11,577 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:56:11,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:56:11,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,585 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:56:11,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:56:11,590 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:56:11,590 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:11,591 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:56:11,592 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:56:11,593 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:56:11,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,602 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:56:11,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:11,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:56:11,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,618 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:56:11,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:56:11,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:11,625 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:11,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:11,630 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:11,631 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:11,632 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:56:12,834 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:56:12,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:56:12,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 185 [2021-11-19 15:56:12,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476687345] [2021-11-19 15:56:12,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:56:12,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 185 states [2021-11-19 15:56:12,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:56:12,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2021-11-19 15:56:12,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7838, Invalid=29604, Unknown=0, NotChecked=0, Total=37442 [2021-11-19 15:56:12,839 INFO L87 Difference]: Start difference. First operand 363 states and 365 transitions. Second operand has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 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) [2021-11-19 15:56:18,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:56:18,689 INFO L93 Difference]: Finished difference Result 1025 states and 1089 transitions. [2021-11-19 15:56:18,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2021-11-19 15:56:18,689 INFO L78 Accepts]: Start accepts. Automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 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 362 [2021-11-19 15:56:18,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:56:18,691 INFO L225 Difference]: With dead ends: 1025 [2021-11-19 15:56:18,692 INFO L226 Difference]: Without dead ends: 547 [2021-11-19 15:56:18,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1324 GetRequests, 1013 SyntacticMatches, 0 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24716 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=22417, Invalid=75239, Unknown=0, NotChecked=0, Total=97656 [2021-11-19 15:56:18,699 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 766 mSDsluCounter, 1587 mSDsCounter, 0 mSdLazyCounter, 1779 mSolverCounterSat, 572 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 1707 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 572 IncrementalHoareTripleChecker+Valid, 1779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-19 15:56:18,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 1707 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [572 Valid, 1779 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-19 15:56:18,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-11-19 15:56:18,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 367. [2021-11-19 15:56:18,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 366 states have (on average 1.0081967213114753) internal successors, (369), 366 states have internal predecessors, (369), 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) [2021-11-19 15:56:18,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 369 transitions. [2021-11-19 15:56:18,738 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 369 transitions. Word has length 362 [2021-11-19 15:56:18,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:56:18,738 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 369 transitions. [2021-11-19 15:56:18,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 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) [2021-11-19 15:56:18,739 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 369 transitions. [2021-11-19 15:56:18,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2021-11-19 15:56:18,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:56:18,740 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 59, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:56:18,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-19 15:56:18,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1828 [2021-11-19 15:56:18,941 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:56:18,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:56:18,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1892514339, now seen corresponding path program 75 times [2021-11-19 15:56:18,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:56:18,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653591489] [2021-11-19 15:56:18,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:56:18,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:56:19,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:56:20,568 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3540 proven. 7082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:20,568 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:56:20,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653591489] [2021-11-19 15:56:20,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653591489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:56:20,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679533017] [2021-11-19 15:56:20,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:56:20,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:20,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:56:20,569 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:56:20,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-19 15:56:20,742 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:56:20,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:56:20,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-19 15:56:20,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:56:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:21,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:56:22,270 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:22,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679533017] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:56:22,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092781662] [2021-11-19 15:56:22,271 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:56:22,271 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:56:22,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:56:22,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:56:22,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:56:22,277 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:56:22,278 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:56:22,279 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,281 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:22,281 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,282 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:56:22,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:56:22,284 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:56:22,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:56:22,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,294 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:56:22,295 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:56:22,298 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:56:22,299 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:22,299 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:56:22,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:56:22,302 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:56:22,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,312 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,313 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:56:22,314 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:22,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:56:22,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,328 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:56:22,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:56:22,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:22,336 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:22,337 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:22,341 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:22,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:22,344 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:56:22,929 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:56:22,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:56:22,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 66 [2021-11-19 15:56:22,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578318231] [2021-11-19 15:56:22,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:56:22,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-19 15:56:22,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:56:22,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-19 15:56:22,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2071, Invalid=3629, Unknown=0, NotChecked=0, Total=5700 [2021-11-19 15:56:22,932 INFO L87 Difference]: Start difference. First operand 367 states and 369 transitions. Second operand has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 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) [2021-11-19 15:56:24,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:56:24,469 INFO L93 Difference]: Finished difference Result 384 states and 387 transitions. [2021-11-19 15:56:24,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-19 15:56:24,470 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 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 366 [2021-11-19 15:56:24,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:56:24,471 INFO L225 Difference]: With dead ends: 384 [2021-11-19 15:56:24,471 INFO L226 Difference]: Without dead ends: 382 [2021-11-19 15:56:24,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1281 GetRequests, 1143 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5224 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=6234, Invalid=12948, Unknown=0, NotChecked=0, Total=19182 [2021-11-19 15:56:24,473 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 383 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:56:24,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 503 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:56:24,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-11-19 15:56:24,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 375. [2021-11-19 15:56:24,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 374 states have (on average 1.0080213903743316) internal successors, (377), 374 states have internal predecessors, (377), 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) [2021-11-19 15:56:24,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 377 transitions. [2021-11-19 15:56:24,514 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 377 transitions. Word has length 366 [2021-11-19 15:56:24,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:56:24,514 INFO L470 AbstractCegarLoop]: Abstraction has 375 states and 377 transitions. [2021-11-19 15:56:24,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 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) [2021-11-19 15:56:24,514 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 377 transitions. [2021-11-19 15:56:24,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2021-11-19 15:56:24,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:56:24,516 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 61, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:56:24,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-19 15:56:24,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1853 [2021-11-19 15:56:24,717 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:56:24,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:56:24,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1941809859, now seen corresponding path program 76 times [2021-11-19 15:56:24,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:56:24,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108152157] [2021-11-19 15:56:24,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:56:24,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:56:24,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:56:28,991 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7262 proven. 3840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:28,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:56:28,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108152157] [2021-11-19 15:56:28,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108152157] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:56:28,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228972582] [2021-11-19 15:56:28,992 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:56:28,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:28,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:56:29,004 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:56:29,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-19 15:56:29,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:56:29,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-19 15:56:29,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:56:35,190 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:56:35,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:56:35,981 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:56:35,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228972582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:56:35,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137296457] [2021-11-19 15:56:35,982 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:56:35,983 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:56:35,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:56:35,983 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:56:35,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:56:35,992 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:56:35,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:56:35,994 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:35,995 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:35,996 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:35,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:56:35,997 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:56:35,998 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:56:36,000 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:56:36,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,007 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:56:36,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:56:36,011 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:56:36,012 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:36,012 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:36,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:56:36,014 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:56:36,015 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:36,016 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:56:36,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,023 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:36,025 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:56:36,026 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:36,027 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:56:36,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,046 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,048 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:56:36,049 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:56:36,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:36,055 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:36,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:36,060 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:36,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:36,063 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:56:37,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:56:37,126 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:56:37,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 124, 124] total 188 [2021-11-19 15:56:37,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760647415] [2021-11-19 15:56:37,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:56:37,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2021-11-19 15:56:37,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:56:37,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-11-19 15:56:37,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8028, Invalid=30584, Unknown=0, NotChecked=0, Total=38612 [2021-11-19 15:56:37,131 INFO L87 Difference]: Start difference. First operand 375 states and 377 transitions. Second operand has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 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) [2021-11-19 15:56:40,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:56:40,849 INFO L93 Difference]: Finished difference Result 809 states and 873 transitions. [2021-11-19 15:56:40,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-19 15:56:40,849 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 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 374 [2021-11-19 15:56:40,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:56:40,852 INFO L225 Difference]: With dead ends: 809 [2021-11-19 15:56:40,852 INFO L226 Difference]: Without dead ends: 560 [2021-11-19 15:56:40,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1306 GetRequests, 1050 SyntacticMatches, 0 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15814 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=15594, Invalid=50712, Unknown=0, NotChecked=0, Total=66306 [2021-11-19 15:56:40,856 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 817 mSDsluCounter, 1335 mSDsCounter, 0 mSdLazyCounter, 1522 mSolverCounterSat, 631 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 817 SdHoareTripleChecker+Valid, 1459 SdHoareTripleChecker+Invalid, 2153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 631 IncrementalHoareTripleChecker+Valid, 1522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:56:40,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [817 Valid, 1459 Invalid, 2153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [631 Valid, 1522 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:56:40,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-11-19 15:56:40,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 377. [2021-11-19 15:56:40,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 376 states have (on average 1.0079787234042554) internal successors, (379), 376 states have internal predecessors, (379), 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) [2021-11-19 15:56:40,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 379 transitions. [2021-11-19 15:56:40,904 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 379 transitions. Word has length 374 [2021-11-19 15:56:40,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:56:40,904 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 379 transitions. [2021-11-19 15:56:40,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 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) [2021-11-19 15:56:40,905 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 379 transitions. [2021-11-19 15:56:40,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2021-11-19 15:56:40,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:56:40,907 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:56:40,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-19 15:56:41,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1878,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:41,107 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:56:41,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:56:41,108 INFO L85 PathProgramCache]: Analyzing trace with hash 605174376, now seen corresponding path program 77 times [2021-11-19 15:56:41,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:56:41,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600333084] [2021-11-19 15:56:41,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:56:41,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:56:41,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:56:45,556 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7262 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:45,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:56:45,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600333084] [2021-11-19 15:56:45,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600333084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:56:45,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127703130] [2021-11-19 15:56:45,557 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:56:45,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:45,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:56:45,557 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:56:45,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-19 15:56:45,978 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-19 15:56:45,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:56:45,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 1389 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-19 15:56:45,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:56:52,410 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:52,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:56:53,279 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:56:53,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127703130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:56:53,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874115350] [2021-11-19 15:56:53,280 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:56:53,280 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:56:53,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:56:53,280 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:56:53,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:56:53,284 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:56:53,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:56:53,286 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,287 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:53,288 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:56:53,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:56:53,291 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:56:53,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:56:53,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,299 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:56:53,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:56:53,304 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:56:53,304 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:56:53,305 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:56:53,306 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:56:53,308 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:56:53,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,316 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,318 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:56:53,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:56:53,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:56:53,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,342 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:56:53,344 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:56:53,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:56:53,355 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:53,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:53,361 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:56:53,363 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:56:53,365 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:56:54,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:56:54,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:56:54,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 126, 126] total 190 [2021-11-19 15:56:54,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297180720] [2021-11-19 15:56:54,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:56:54,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-11-19 15:56:54,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:56:54,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-11-19 15:56:54,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8219, Invalid=31183, Unknown=0, NotChecked=0, Total=39402 [2021-11-19 15:56:54,542 INFO L87 Difference]: Start difference. First operand 377 states and 379 transitions. Second operand has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 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) [2021-11-19 15:56:58,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:56:58,369 INFO L93 Difference]: Finished difference Result 816 states and 881 transitions. [2021-11-19 15:56:58,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-19 15:56:58,370 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 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 376 [2021-11-19 15:56:58,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:56:58,372 INFO L225 Difference]: With dead ends: 816 [2021-11-19 15:56:58,372 INFO L226 Difference]: Without dead ends: 565 [2021-11-19 15:56:58,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1055 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16095 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=16033, Invalid=51827, Unknown=0, NotChecked=0, Total=67860 [2021-11-19 15:56:58,375 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 778 mSDsluCounter, 1357 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 551 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 778 SdHoareTripleChecker+Valid, 1483 SdHoareTripleChecker+Invalid, 2100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 551 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:56:58,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [778 Valid, 1483 Invalid, 2100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [551 Valid, 1549 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 15:56:58,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-11-19 15:56:58,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 379. [2021-11-19 15:56:58,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 378 states have (on average 1.007936507936508) internal successors, (381), 378 states have internal predecessors, (381), 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) [2021-11-19 15:56:58,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2021-11-19 15:56:58,425 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 376 [2021-11-19 15:56:58,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:56:58,425 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2021-11-19 15:56:58,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 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) [2021-11-19 15:56:58,425 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2021-11-19 15:56:58,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2021-11-19 15:56:58,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:56:58,427 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:56:58,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-19 15:56:58,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1903,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:56:58,628 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:56:58,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:56:58,628 INFO L85 PathProgramCache]: Analyzing trace with hash 293696717, now seen corresponding path program 78 times [2021-11-19 15:56:58,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:56:58,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871652090] [2021-11-19 15:56:58,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:56:58,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:56:58,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:00,276 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3782 proven. 7566 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:00,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:57:00,277 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871652090] [2021-11-19 15:57:00,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871652090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:57:00,277 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938007157] [2021-11-19 15:57:00,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:57:00,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:00,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:57:00,278 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:57:00,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-19 15:57:00,480 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:57:00,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:57:00,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 1399 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-19 15:57:00,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:57:01,357 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:01,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:57:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:02,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938007157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:57:02,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463393863] [2021-11-19 15:57:02,136 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:57:02,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:57:02,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:57:02,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:57:02,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:57:02,140 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:57:02,141 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:57:02,142 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,143 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:02,144 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:57:02,145 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:57:02,146 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:57:02,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:57:02,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,155 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:57:02,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:57:02,159 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:57:02,160 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:02,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,162 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:57:02,162 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:57:02,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:57:02,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,172 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:57:02,175 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:02,176 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:57:02,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,187 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:57:02,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:57:02,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:02,197 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:02,198 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:02,202 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:02,204 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:02,205 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:57:02,783 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:57:02,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:57:02,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 68 [2021-11-19 15:57:02,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267351289] [2021-11-19 15:57:02,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:57:02,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-19 15:57:02,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:57:02,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-19 15:57:02,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2200, Invalid=3806, Unknown=0, NotChecked=0, Total=6006 [2021-11-19 15:57:02,785 INFO L87 Difference]: Start difference. First operand 379 states and 381 transitions. Second operand has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 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) [2021-11-19 15:57:04,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:57:04,401 INFO L93 Difference]: Finished difference Result 396 states and 399 transitions. [2021-11-19 15:57:04,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-19 15:57:04,401 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 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 378 [2021-11-19 15:57:04,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:57:04,403 INFO L225 Difference]: With dead ends: 396 [2021-11-19 15:57:04,403 INFO L226 Difference]: Without dead ends: 394 [2021-11-19 15:57:04,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1323 GetRequests, 1181 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=6625, Invalid=13681, Unknown=0, NotChecked=0, Total=20306 [2021-11-19 15:57:04,405 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 331 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:57:04,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 602 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:57:04,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-11-19 15:57:04,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 387. [2021-11-19 15:57:04,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0077720207253886) internal successors, (389), 386 states have internal predecessors, (389), 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) [2021-11-19 15:57:04,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 389 transitions. [2021-11-19 15:57:04,445 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 389 transitions. Word has length 378 [2021-11-19 15:57:04,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:57:04,445 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 389 transitions. [2021-11-19 15:57:04,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 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) [2021-11-19 15:57:04,445 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 389 transitions. [2021-11-19 15:57:04,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-19 15:57:04,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:57:04,447 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 63, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:57:04,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-19 15:57:04,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1928,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:04,647 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:57:04,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:57:04,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1734781363, now seen corresponding path program 79 times [2021-11-19 15:57:04,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:57:04,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725488899] [2021-11-19 15:57:04,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:57:04,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:57:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7752 proven. 4092 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:09,319 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:57:09,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725488899] [2021-11-19 15:57:09,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725488899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:57:09,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090386665] [2021-11-19 15:57:09,320 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:57:09,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:09,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:57:09,321 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:57:09,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-19 15:57:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:09,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 1423 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-19 15:57:09,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:57:15,921 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:57:15,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:57:16,781 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:57:16,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090386665] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:57:16,782 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805487908] [2021-11-19 15:57:16,783 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:57:16,783 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:57:16,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:57:16,783 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:57:16,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:57:16,787 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:57:16,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:57:16,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,791 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:16,791 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:57:16,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:57:16,795 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:57:16,797 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 69 [2021-11-19 15:57:16,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,806 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:57:16,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:57:16,811 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:57:16,811 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:16,812 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,813 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:57:16,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:57:16,815 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:57:16,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,826 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:57:16,829 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:16,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:57:16,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,854 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:57:16,856 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:57:16,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:16,865 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:16,867 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:16,871 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:16,873 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:16,874 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:57:18,089 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:57:18,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:57:18,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 128, 128] total 194 [2021-11-19 15:57:18,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616894967] [2021-11-19 15:57:18,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:57:18,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2021-11-19 15:57:18,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:57:18,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2021-11-19 15:57:18,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8542, Invalid=32464, Unknown=0, NotChecked=0, Total=41006 [2021-11-19 15:57:18,094 INFO L87 Difference]: Start difference. First operand 387 states and 389 transitions. Second operand has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 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) [2021-11-19 15:57:22,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:57:22,634 INFO L93 Difference]: Finished difference Result 835 states and 901 transitions. [2021-11-19 15:57:22,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-19 15:57:22,634 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 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 386 [2021-11-19 15:57:22,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:57:22,637 INFO L225 Difference]: With dead ends: 835 [2021-11-19 15:57:22,637 INFO L226 Difference]: Without dead ends: 578 [2021-11-19 15:57:22,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1348 GetRequests, 1084 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16773 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=16608, Invalid=53882, Unknown=0, NotChecked=0, Total=70490 [2021-11-19 15:57:22,641 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 692 mSDsluCounter, 1562 mSDsCounter, 0 mSdLazyCounter, 1768 mSolverCounterSat, 703 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 692 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 2471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 1768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:57:22,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [692 Valid, 1690 Invalid, 2471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 1768 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 15:57:22,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-11-19 15:57:22,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 389. [2021-11-19 15:57:22,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 1.0077319587628866) internal successors, (391), 388 states have internal predecessors, (391), 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) [2021-11-19 15:57:22,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 391 transitions. [2021-11-19 15:57:22,682 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 391 transitions. Word has length 386 [2021-11-19 15:57:22,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:57:22,682 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 391 transitions. [2021-11-19 15:57:22,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 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) [2021-11-19 15:57:22,682 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 391 transitions. [2021-11-19 15:57:22,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-19 15:57:22,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:57:22,684 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:57:22,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-19 15:57:22,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1953 [2021-11-19 15:57:22,885 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:57:22,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:57:22,885 INFO L85 PathProgramCache]: Analyzing trace with hash 617605592, now seen corresponding path program 80 times [2021-11-19 15:57:22,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:57:22,885 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519517223] [2021-11-19 15:57:22,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:57:22,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:57:23,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7752 proven. 4218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:27,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:57:27,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519517223] [2021-11-19 15:57:27,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519517223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:57:27,619 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135282141] [2021-11-19 15:57:27,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:57:27,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:27,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:57:27,620 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:57:27,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-19 15:57:28,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-19 15:57:28,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:57:28,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 1433 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-19 15:57:28,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:57:34,578 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:34,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:57:35,340 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:35,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2135282141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:57:35,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028068438] [2021-11-19 15:57:35,341 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:57:35,341 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:57:35,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:57:35,342 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:57:35,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:57:35,345 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:57:35,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:57:35,347 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,349 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:35,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:57:35,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:57:35,380 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:57:35,383 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:57:35,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,390 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:57:35,392 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:57:35,394 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:57:35,395 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:35,395 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,396 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:57:35,397 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:57:35,398 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,399 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:57:35,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,407 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,408 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:57:35,409 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:35,411 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:57:35,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,421 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:57:35,422 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:57:35,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,427 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:35,429 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:35,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:35,434 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:35,436 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:35,437 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:57:36,541 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:57:36,542 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:57:36,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [130, 130, 130] total 196 [2021-11-19 15:57:36,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864416269] [2021-11-19 15:57:36,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:57:36,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2021-11-19 15:57:36,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:57:36,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2021-11-19 15:57:36,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8739, Invalid=33081, Unknown=0, NotChecked=0, Total=41820 [2021-11-19 15:57:36,546 INFO L87 Difference]: Start difference. First operand 389 states and 391 transitions. Second operand has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 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) [2021-11-19 15:57:41,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:57:41,127 INFO L93 Difference]: Finished difference Result 842 states and 909 transitions. [2021-11-19 15:57:41,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-19 15:57:41,127 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 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 388 [2021-11-19 15:57:41,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:57:41,130 INFO L225 Difference]: With dead ends: 842 [2021-11-19 15:57:41,130 INFO L226 Difference]: Without dead ends: 583 [2021-11-19 15:57:41,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1356 GetRequests, 1089 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17062 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=17061, Invalid=55031, Unknown=0, NotChecked=0, Total=72092 [2021-11-19 15:57:41,134 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 775 mSDsluCounter, 1494 mSDsCounter, 0 mSdLazyCounter, 1694 mSolverCounterSat, 944 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 775 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 2638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 944 IncrementalHoareTripleChecker+Valid, 1694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:57:41,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [775 Valid, 1624 Invalid, 2638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [944 Valid, 1694 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 15:57:41,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-11-19 15:57:41,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 391. [2021-11-19 15:57:41,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 1.0076923076923077) internal successors, (393), 390 states have internal predecessors, (393), 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) [2021-11-19 15:57:41,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 393 transitions. [2021-11-19 15:57:41,182 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 393 transitions. Word has length 388 [2021-11-19 15:57:41,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:57:41,183 INFO L470 AbstractCegarLoop]: Abstraction has 391 states and 393 transitions. [2021-11-19 15:57:41,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 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) [2021-11-19 15:57:41,183 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 393 transitions. [2021-11-19 15:57:41,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2021-11-19 15:57:41,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:57:41,185 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:57:41,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-19 15:57:41,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1978 [2021-11-19 15:57:41,385 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:57:41,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:57:41,386 INFO L85 PathProgramCache]: Analyzing trace with hash 753513661, now seen corresponding path program 81 times [2021-11-19 15:57:41,386 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:57:41,386 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557520667] [2021-11-19 15:57:41,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:57:41,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:57:41,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:43,347 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4032 proven. 8066 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:43,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:57:43,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557520667] [2021-11-19 15:57:43,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557520667] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:57:43,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933694205] [2021-11-19 15:57:43,347 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:57:43,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:43,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:57:43,348 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:57:43,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-19 15:57:43,548 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:57:43,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:57:43,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-19 15:57:43,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:57:44,348 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:44,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:57:45,139 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:45,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933694205] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:57:45,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735585875] [2021-11-19 15:57:45,142 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:57:45,142 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:57:45,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:57:45,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:57:45,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:57:45,156 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:57:45,158 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:57:45,160 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,163 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:45,164 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:57:45,166 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:57:45,169 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:57:45,172 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:57:45,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,185 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:57:45,188 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:57:45,192 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:57:45,193 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:57:45,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:57:45,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:57:45,198 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:57:45,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:57:45,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:57:45,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:57:45,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,228 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:57:45,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:57:45,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:57:45,238 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:45,240 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:45,244 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:57:45,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:57:45,247 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:57:45,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:57:45,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:57:45,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 70 [2021-11-19 15:57:45,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792208346] [2021-11-19 15:57:45,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:57:45,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-19 15:57:45,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:57:45,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-19 15:57:45,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2333, Invalid=3987, Unknown=0, NotChecked=0, Total=6320 [2021-11-19 15:57:45,963 INFO L87 Difference]: Start difference. First operand 391 states and 393 transitions. Second operand has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 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) [2021-11-19 15:57:47,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:57:47,841 INFO L93 Difference]: Finished difference Result 408 states and 411 transitions. [2021-11-19 15:57:47,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-19 15:57:47,842 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 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 390 [2021-11-19 15:57:47,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:57:47,844 INFO L225 Difference]: With dead ends: 408 [2021-11-19 15:57:47,844 INFO L226 Difference]: Without dead ends: 406 [2021-11-19 15:57:47,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1219 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5824 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=7028, Invalid=14434, Unknown=0, NotChecked=0, Total=21462 [2021-11-19 15:57:47,846 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 404 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:57:47,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [404 Valid, 541 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:57:47,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-19 15:57:47,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 399. [2021-11-19 15:57:47,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.0075376884422111) internal successors, (401), 398 states have internal predecessors, (401), 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) [2021-11-19 15:57:47,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 401 transitions. [2021-11-19 15:57:47,898 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 401 transitions. Word has length 390 [2021-11-19 15:57:47,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:57:47,898 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 401 transitions. [2021-11-19 15:57:47,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 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) [2021-11-19 15:57:47,899 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 401 transitions. [2021-11-19 15:57:47,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2021-11-19 15:57:47,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:57:47,901 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 65, 64, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:57:47,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-19 15:57:48,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2003 [2021-11-19 15:57:48,101 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:57:48,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:57:48,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1917319587, now seen corresponding path program 82 times [2021-11-19 15:57:48,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:57:48,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674345936] [2021-11-19 15:57:48,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:57:48,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:57:48,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:52,998 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8258 proven. 4352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:57:52,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:57:52,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674345936] [2021-11-19 15:57:52,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674345936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:57:52,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649505857] [2021-11-19 15:57:52,999 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:57:52,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:57:52,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:57:53,000 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:57:53,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-19 15:57:53,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:57:53,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 1467 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-19 15:57:53,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:58:00,056 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:58:00,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:58:00,944 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:58:00,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649505857] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:58:00,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1044108364] [2021-11-19 15:58:00,945 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:58:00,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:58:00,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:58:00,946 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:58:00,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:58:00,949 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:58:00,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:58:00,952 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,953 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:00,953 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,954 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:58:00,955 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:58:00,956 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:58:00,958 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 75 [2021-11-19 15:58:00,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,966 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:58:00,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:58:00,971 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:58:00,971 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:00,972 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,973 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:58:00,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:58:00,975 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,977 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:58:00,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,985 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:58:00,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:00,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:58:00,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:00,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,002 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:58:01,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:58:01,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:01,011 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:01,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:01,016 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:01,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:01,019 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:58:02,268 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:58:02,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:58:02,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 132, 132] total 200 [2021-11-19 15:58:02,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121585140] [2021-11-19 15:58:02,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:58:02,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 200 states [2021-11-19 15:58:02,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:58:02,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2021-11-19 15:58:02,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=34400, Unknown=0, NotChecked=0, Total=43472 [2021-11-19 15:58:02,273 INFO L87 Difference]: Start difference. First operand 399 states and 401 transitions. Second operand has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 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) [2021-11-19 15:58:07,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:58:07,304 INFO L93 Difference]: Finished difference Result 861 states and 929 transitions. [2021-11-19 15:58:07,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-19 15:58:07,305 INFO L78 Accepts]: Start accepts. Automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 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 398 [2021-11-19 15:58:07,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:58:07,308 INFO L225 Difference]: With dead ends: 861 [2021-11-19 15:58:07,308 INFO L226 Difference]: Without dead ends: 596 [2021-11-19 15:58:07,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1390 GetRequests, 1118 SyntacticMatches, 0 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17760 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=17654, Invalid=57148, Unknown=0, NotChecked=0, Total=74802 [2021-11-19 15:58:07,312 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 747 mSDsluCounter, 1409 mSDsCounter, 0 mSdLazyCounter, 1609 mSolverCounterSat, 807 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 747 SdHoareTripleChecker+Valid, 1541 SdHoareTripleChecker+Invalid, 2416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 807 IncrementalHoareTripleChecker+Valid, 1609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:58:07,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [747 Valid, 1541 Invalid, 2416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [807 Valid, 1609 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 15:58:07,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2021-11-19 15:58:07,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 401. [2021-11-19 15:58:07,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 1.0075) internal successors, (403), 400 states have internal predecessors, (403), 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) [2021-11-19 15:58:07,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 403 transitions. [2021-11-19 15:58:07,375 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 403 transitions. Word has length 398 [2021-11-19 15:58:07,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:58:07,376 INFO L470 AbstractCegarLoop]: Abstraction has 401 states and 403 transitions. [2021-11-19 15:58:07,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 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) [2021-11-19 15:58:07,376 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 403 transitions. [2021-11-19 15:58:07,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2021-11-19 15:58:07,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:58:07,379 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:58:07,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-19 15:58:07,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2028 [2021-11-19 15:58:07,582 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:58:07,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:58:07,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1799280056, now seen corresponding path program 83 times [2021-11-19 15:58:07,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:58:07,582 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525744881] [2021-11-19 15:58:07,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:58:07,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:58:07,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:58:12,819 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8258 proven. 4482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:12,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:58:12,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525744881] [2021-11-19 15:58:12,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525744881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:58:12,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204312929] [2021-11-19 15:58:12,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:58:12,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:58:12,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:58:12,821 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:58:12,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-19 15:58:13,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2021-11-19 15:58:13,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:58:13,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 1477 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-19 15:58:13,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:58:20,942 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:20,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:58:21,916 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:21,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204312929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:58:21,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494973502] [2021-11-19 15:58:21,918 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:58:21,918 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:58:21,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:58:21,919 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:58:21,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:58:21,928 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:58:21,929 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:58:21,931 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,932 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:21,933 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:58:21,935 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:58:21,936 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:58:21,939 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:58:21,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,948 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:58:21,950 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:58:21,953 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:58:21,954 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:21,954 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,956 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:58:21,956 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:58:21,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:58:21,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,969 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:58:21,972 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:21,974 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:58:21,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,992 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:58:21,994 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:58:21,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:21,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:22,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:22,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:22,003 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:22,004 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:22,044 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:22,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:22,047 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:58:23,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:58:23,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:58:23,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134, 134] total 202 [2021-11-19 15:58:23,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686726917] [2021-11-19 15:58:23,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:58:23,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2021-11-19 15:58:23,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:58:23,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2021-11-19 15:58:23,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9275, Invalid=35035, Unknown=0, NotChecked=0, Total=44310 [2021-11-19 15:58:23,352 INFO L87 Difference]: Start difference. First operand 401 states and 403 transitions. Second operand has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 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) [2021-11-19 15:58:28,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:58:28,650 INFO L93 Difference]: Finished difference Result 868 states and 937 transitions. [2021-11-19 15:58:28,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-19 15:58:28,651 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 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 400 [2021-11-19 15:58:28,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:58:28,654 INFO L225 Difference]: With dead ends: 868 [2021-11-19 15:58:28,654 INFO L226 Difference]: Without dead ends: 601 [2021-11-19 15:58:28,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1398 GetRequests, 1123 SyntacticMatches, 0 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18057 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=18121, Invalid=58331, Unknown=0, NotChecked=0, Total=76452 [2021-11-19 15:58:28,659 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 635 mSDsluCounter, 1709 mSDsCounter, 0 mSdLazyCounter, 1910 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 1843 SdHoareTripleChecker+Invalid, 2332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 1910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:58:28,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [635 Valid, 1843 Invalid, 2332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 1910 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 15:58:28,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-11-19 15:58:28,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 403. [2021-11-19 15:58:28,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 1.007462686567164) internal successors, (405), 402 states have internal predecessors, (405), 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) [2021-11-19 15:58:28,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 405 transitions. [2021-11-19 15:58:28,710 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 405 transitions. Word has length 400 [2021-11-19 15:58:28,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:58:28,710 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 405 transitions. [2021-11-19 15:58:28,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 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) [2021-11-19 15:58:28,711 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 405 transitions. [2021-11-19 15:58:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2021-11-19 15:58:28,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:58:28,713 INFO L514 BasicCegarLoop]: trace histogram [67, 66, 66, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:58:28,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-19 15:58:28,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2053,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:58:28,913 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:58:28,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:58:28,914 INFO L85 PathProgramCache]: Analyzing trace with hash -38746707, now seen corresponding path program 84 times [2021-11-19 15:58:28,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:58:28,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717808395] [2021-11-19 15:58:28,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:58:28,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:58:29,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:58:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4290 proven. 8582 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:30,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:58:30,938 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717808395] [2021-11-19 15:58:30,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717808395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:58:30,939 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998258455] [2021-11-19 15:58:30,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 15:58:30,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:58:30,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:58:30,941 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:58:30,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-19 15:58:31,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 15:58:31,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:58:31,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 1487 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-19 15:58:31,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:58:32,061 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:32,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:58:33,034 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:33,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998258455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:58:33,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1804758720] [2021-11-19 15:58:33,035 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:58:33,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:58:33,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:58:33,036 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:58:33,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:58:33,040 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:58:33,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:58:33,043 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,045 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:33,045 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,046 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:58:33,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:58:33,048 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:58:33,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 15:58:33,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,058 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:58:33,060 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:58:33,063 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:58:33,064 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:33,064 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:58:33,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:58:33,067 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:58:33,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,078 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,079 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 96 [2021-11-19 15:58:33,081 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:33,087 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-19 15:58:33,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,106 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:58:33,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:58:33,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:33,115 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:33,117 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:33,120 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:33,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:33,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:58:33,809 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:58:33,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:58:33,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 72 [2021-11-19 15:58:33,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428473115] [2021-11-19 15:58:33,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:58:33,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-19 15:58:33,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:58:33,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-19 15:58:33,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2470, Invalid=4172, Unknown=0, NotChecked=0, Total=6642 [2021-11-19 15:58:33,812 INFO L87 Difference]: Start difference. First operand 403 states and 405 transitions. Second operand has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 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) [2021-11-19 15:58:35,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:58:35,736 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2021-11-19 15:58:35,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-11-19 15:58:35,736 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 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 402 [2021-11-19 15:58:35,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:58:35,739 INFO L225 Difference]: With dead ends: 420 [2021-11-19 15:58:35,739 INFO L226 Difference]: Without dead ends: 418 [2021-11-19 15:58:35,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1407 GetRequests, 1257 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6136 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=7443, Invalid=15207, Unknown=0, NotChecked=0, Total=22650 [2021-11-19 15:58:35,741 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 357 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:58:35,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 596 Invalid, 978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:58:35,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-11-19 15:58:35,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 411. [2021-11-19 15:58:35,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 410 states have (on average 1.0073170731707317) internal successors, (413), 410 states have internal predecessors, (413), 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) [2021-11-19 15:58:35,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 413 transitions. [2021-11-19 15:58:35,797 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 413 transitions. Word has length 402 [2021-11-19 15:58:35,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:58:35,798 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 413 transitions. [2021-11-19 15:58:35,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 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) [2021-11-19 15:58:35,798 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 413 transitions. [2021-11-19 15:58:35,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2021-11-19 15:58:35,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:58:35,800 INFO L514 BasicCegarLoop]: trace histogram [68, 67, 67, 67, 67, 66, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:58:35,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-19 15:58:36,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2078 [2021-11-19 15:58:36,001 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:58:36,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:58:36,001 INFO L85 PathProgramCache]: Analyzing trace with hash -752412013, now seen corresponding path program 85 times [2021-11-19 15:58:36,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:58:36,001 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672260352] [2021-11-19 15:58:36,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:58:36,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:58:36,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:58:41,464 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8780 proven. 4620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:58:41,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:58:41,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672260352] [2021-11-19 15:58:41,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672260352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:58:41,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003038307] [2021-11-19 15:58:41,465 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 15:58:41,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:58:41,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:58:41,472 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:58:41,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-19 15:58:41,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:58:41,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1511 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-19 15:58:41,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:58:48,726 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8976 proven. 4422 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:58:48,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:58:49,533 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8976 proven. 4422 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 15:58:49,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003038307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:58:49,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522425911] [2021-11-19 15:58:49,535 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:58:49,535 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:58:49,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:58:49,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:58:49,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:58:49,538 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:58:49,539 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:58:49,541 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,542 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:49,542 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:58:49,544 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:58:49,545 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:58:49,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:58:49,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,553 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:58:49,555 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:58:49,557 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:58:49,558 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:58:49,559 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:58:49,560 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:58:49,561 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,563 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:58:49,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,571 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:58:49,572 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:58:49,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:58:49,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,585 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:58:49,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:58:49,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:58:49,593 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:49,594 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:49,597 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:58:49,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:58:49,600 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:58:50,742 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:58:50,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:58:50,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 136, 136] total 206 [2021-11-19 15:58:50,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980558724] [2021-11-19 15:58:50,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:58:50,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 206 states [2021-11-19 15:58:50,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:58:50,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 206 interpolants. [2021-11-19 15:58:50,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9618, Invalid=36392, Unknown=0, NotChecked=0, Total=46010 [2021-11-19 15:58:50,748 INFO L87 Difference]: Start difference. First operand 411 states and 413 transitions. Second operand has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 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) [2021-11-19 15:58:55,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:58:55,636 INFO L93 Difference]: Finished difference Result 887 states and 957 transitions. [2021-11-19 15:58:55,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-19 15:58:55,637 INFO L78 Accepts]: Start accepts. Automaton has has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 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 410 [2021-11-19 15:58:55,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:58:55,639 INFO L225 Difference]: With dead ends: 887 [2021-11-19 15:58:55,639 INFO L226 Difference]: Without dead ends: 614 [2021-11-19 15:58:55,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1432 GetRequests, 1152 SyntacticMatches, 0 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18775 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=18732, Invalid=60510, Unknown=0, NotChecked=0, Total=79242 [2021-11-19 15:58:55,643 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 654 mSDsluCounter, 1891 mSDsCounter, 0 mSdLazyCounter, 2105 mSolverCounterSat, 704 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 654 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 2809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 704 IncrementalHoareTripleChecker+Valid, 2105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:58:55,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [654 Valid, 2027 Invalid, 2809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [704 Valid, 2105 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-19 15:58:55,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-11-19 15:58:55,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 413. [2021-11-19 15:58:55,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 412 states have (on average 1.0072815533980584) internal successors, (415), 412 states have internal predecessors, (415), 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) [2021-11-19 15:58:55,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 415 transitions. [2021-11-19 15:58:55,691 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 415 transitions. Word has length 410 [2021-11-19 15:58:55,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:58:55,691 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 415 transitions. [2021-11-19 15:58:55,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 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) [2021-11-19 15:58:55,692 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 415 transitions. [2021-11-19 15:58:55,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2021-11-19 15:58:55,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:58:55,694 INFO L514 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:58:55,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-19 15:58:55,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2103 [2021-11-19 15:58:55,894 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:58:55,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:58:55,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1405844408, now seen corresponding path program 86 times [2021-11-19 15:58:55,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:58:55,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302352240] [2021-11-19 15:58:55,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:58:55,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:58:56,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:59:00,852 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8780 proven. 4754 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:59:00,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:59:00,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302352240] [2021-11-19 15:59:00,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302352240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:59:00,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314172715] [2021-11-19 15:59:00,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 15:59:00,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:59:00,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:59:00,853 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:59:00,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2365d71-87ce-44ce-b14f-d730ebb92a37/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-19 15:59:01,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2021-11-19 15:59:01,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 15:59:01,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 1521 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-19 15:59:01,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:59:08,459 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8978 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:59:08,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:59:09,267 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8978 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:59:09,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314172715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:59:09,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1819251619] [2021-11-19 15:59:09,268 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-19 15:59:09,268 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:59:09,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:59:09,268 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:59:09,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:59:09,276 INFO L180 QuantifierPusher]: treesize reduction 13, result has 83.8 percent of original size [2021-11-19 15:59:09,277 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 63 [2021-11-19 15:59:09,279 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,280 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:59:09,280 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-19 15:59:09,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 66 [2021-11-19 15:59:09,284 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-11-19 15:59:09,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-11-19 15:59:09,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,295 INFO L180 QuantifierPusher]: treesize reduction 12, result has 81.0 percent of original size [2021-11-19 15:59:09,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 15:59:09,299 INFO L180 QuantifierPusher]: treesize reduction 12, result has 76.5 percent of original size [2021-11-19 15:59:09,300 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:59:09,300 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:59:09,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-19 15:59:09,307 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,309 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 61 [2021-11-19 15:59:09,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,321 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 94 [2021-11-19 15:59:09,322 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:59:09,325 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 114 [2021-11-19 15:59:09,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,335 INFO L180 QuantifierPusher]: treesize reduction 12, result has 85.2 percent of original size [2021-11-19 15:59:09,337 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 59 [2021-11-19 15:59:09,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:59:09,343 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:59:09,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:59:09,348 INFO L180 QuantifierPusher]: treesize reduction 12, result has 84.6 percent of original size [2021-11-19 15:59:09,350 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 54 [2021-11-19 15:59:09,351 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:59:10,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:59:10,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:59:10,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [138, 138, 138] total 208 [2021-11-19 15:59:10,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482857252] [2021-11-19 15:59:10,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:59:10,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2021-11-19 15:59:10,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:59:10,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2021-11-19 15:59:10,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9827, Invalid=37045, Unknown=0, NotChecked=0, Total=46872 [2021-11-19 15:59:10,535 INFO L87 Difference]: Start difference. First operand 413 states and 415 transitions. Second operand has 208 states, 208 states have (on average 3.3076923076923075) internal successors, (688), 208 states have internal predecessors, (688), 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)