./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/up.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/up.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:26:23,441 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:26:23,443 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:26:23,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:26:23,481 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:26:23,483 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:26:23,485 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:26:23,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:26:23,491 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:26:23,493 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:26:23,495 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:26:23,497 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:26:23,497 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:26:23,499 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:26:23,501 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:26:23,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:26:23,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:26:23,506 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:26:23,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:26:23,512 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:26:23,515 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:26:23,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:26:23,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:26:23,525 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:26:23,538 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:26:23,539 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:26:23,539 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:26:23,540 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:26:23,541 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:26:23,543 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:26:23,543 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:26:23,550 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:26:23,553 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:26:23,554 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:26:23,559 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:26:23,560 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:26:23,561 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:26:23,561 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:26:23,561 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:26:23,563 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:26:23,564 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:26:23,565 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:26:23,624 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:26:23,625 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:26:23,626 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:26:23,626 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:26:23,635 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:26:23,635 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:26:23,636 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:26:23,636 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:26:23,636 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:26:23,637 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:26:23,638 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:26:23,638 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:26:23,639 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:26:23,639 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:26:23,639 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:26:23,640 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:26:23,640 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:26:23,641 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:26:23,642 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:26:23,642 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:26:23,643 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:26:23,643 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:26:23,643 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:26:23,644 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:26:23,644 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:26:23,644 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:26:23,646 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:26:23,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:26:23,647 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:26:23,647 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:26:23,648 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:26:23,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:26:23,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:23,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:26:23,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:26:23,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:26:23,650 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:26:23,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:26:23,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:26:23,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:26:23,651 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:26:23,651 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_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ff5c10c83c8d29dcc2c2798035fa2754df224d2313ad9c91b6ee5bb6ca3d9a9f [2021-11-23 02:26:24,046 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:26:24,092 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:26:24,095 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:26:24,097 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:26:24,098 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:26:24,100 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/loop-invgen/up.i [2021-11-23 02:26:24,198 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/data/f8abe9fcf/8032077bf6d649bf89afaf2c6efa5e65/FLAG2c16377b4 [2021-11-23 02:26:24,718 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:26:24,718 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/sv-benchmarks/c/loop-invgen/up.i [2021-11-23 02:26:24,730 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/data/f8abe9fcf/8032077bf6d649bf89afaf2c6efa5e65/FLAG2c16377b4 [2021-11-23 02:26:25,109 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/data/f8abe9fcf/8032077bf6d649bf89afaf2c6efa5e65 [2021-11-23 02:26:25,113 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:26:25,117 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:26:25,125 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:25,127 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:26:25,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:26:25,131 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,132 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50bb723d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25, skipping insertion in model container [2021-11-23 02:26:25,132 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,141 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:26:25,158 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:26:25,348 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_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/sv-benchmarks/c/loop-invgen/up.i[893,906] [2021-11-23 02:26:25,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:25,388 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:26:25,413 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_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/sv-benchmarks/c/loop-invgen/up.i[893,906] [2021-11-23 02:26:25,421 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:25,441 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:26:25,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25 WrapperNode [2021-11-23 02:26:25,442 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:25,443 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:25,443 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:26:25,443 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:26:25,455 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,466 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,503 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2021-11-23 02:26:25,505 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:25,506 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:26:25,506 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:26:25,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:26:25,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,518 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,521 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,521 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,536 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,542 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,543 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,545 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:26:25,546 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:26:25,546 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:26:25,546 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:26:25,551 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (1/1) ... [2021-11-23 02:26:25,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:25,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:25,599 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:26:25,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:26:25,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:26:25,661 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:26:25,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:26:25,661 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:26:25,743 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:26:25,745 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:26:25,915 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:26:25,951 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:26:25,951 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:26:25,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:25 BoogieIcfgContainer [2021-11-23 02:26:25,955 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:26:25,957 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:26:25,957 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:26:25,969 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:26:25,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:26:25" (1/3) ... [2021-11-23 02:26:25,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@476f21e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:25, skipping insertion in model container [2021-11-23 02:26:25,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:25" (2/3) ... [2021-11-23 02:26:25,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@476f21e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:25, skipping insertion in model container [2021-11-23 02:26:25,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:25" (3/3) ... [2021-11-23 02:26:25,974 INFO L111 eAbstractionObserver]: Analyzing ICFG up.i [2021-11-23 02:26:25,988 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:26:25,989 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:26:26,046 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:26:26,054 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:26:26,054 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:26:26,071 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) [2021-11-23 02:26:26,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-23 02:26:26,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:26,078 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-23 02:26:26,079 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:26,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:26,094 INFO L85 PathProgramCache]: Analyzing trace with hash 67887828, now seen corresponding path program 1 times [2021-11-23 02:26:26,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:26,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609943438] [2021-11-23 02:26:26,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:26,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:26,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:26,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609943438] [2021-11-23 02:26:26,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609943438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:26,392 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:26,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:26,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611748091] [2021-11-23 02:26:26,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:26,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:26:26,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:26,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:26:26,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:26,481 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:26,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:26,537 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2021-11-23 02:26:26,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:26:26,540 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-11-23 02:26:26,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:26,549 INFO L225 Difference]: With dead ends: 17 [2021-11-23 02:26:26,549 INFO L226 Difference]: Without dead ends: 8 [2021-11-23 02:26:26,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:26:26,557 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:26,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:26:26,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-23 02:26:26,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-23 02:26:26,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:26,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-23 02:26:26,596 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-23 02:26:26,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:26,596 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-23 02:26:26,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:26,597 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-23 02:26:26,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:26:26,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:26,598 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:26:26,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:26:26,600 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:26,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:26,605 INFO L85 PathProgramCache]: Analyzing trace with hash 2072851919, now seen corresponding path program 1 times [2021-11-23 02:26:26,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:26,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032925900] [2021-11-23 02:26:26,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:26,730 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:26,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032925900] [2021-11-23 02:26:26,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032925900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:26,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413267440] [2021-11-23 02:26:26,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:26,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:26,741 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:26,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:26:26,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:26:26,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:26,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:26,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:26:26,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413267440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:26,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:26:26,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 02:26:26,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425497530] [2021-11-23 02:26:26,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:26,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:26:26,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:26,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:26:26,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:26:26,956 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:27,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:27,035 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-11-23 02:26:27,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:26:27,040 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-23 02:26:27,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:27,041 INFO L225 Difference]: With dead ends: 18 [2021-11-23 02:26:27,041 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 02:26:27,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:26:27,046 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:27,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 9 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:26:27,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 02:26:27,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 10. [2021-11-23 02:26:27,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:27,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-23 02:26:27,063 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 6 [2021-11-23 02:26:27,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:27,063 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-23 02:26:27,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:27,064 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-23 02:26:27,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:26:27,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:27,064 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:27,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:27,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:27,280 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:27,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:27,281 INFO L85 PathProgramCache]: Analyzing trace with hash -703442678, now seen corresponding path program 1 times [2021-11-23 02:26:27,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:27,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225812724] [2021-11-23 02:26:27,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:27,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:27,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:27,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:27,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225812724] [2021-11-23 02:26:27,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225812724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:27,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470260903] [2021-11-23 02:26:27,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:27,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:27,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:27,413 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:27,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:26:27,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:27,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:26:27,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:27,599 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:27,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:27,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470260903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:27,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1925500288] [2021-11-23 02:26:27,720 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:27,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:27,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:27,735 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:27,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:28,129 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:28,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '178#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:28,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:28,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:28,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-23 02:26:28,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888299238] [2021-11-23 02:26:28,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:28,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:26:28,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:28,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:26:28,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:26:28,408 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:28,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:28,510 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-11-23 02:26:28,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:26:28,512 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 02:26:28,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:28,513 INFO L225 Difference]: With dead ends: 20 [2021-11-23 02:26:28,513 INFO L226 Difference]: Without dead ends: 11 [2021-11-23 02:26:28,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:26:28,519 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:28,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 20 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:26:28,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-23 02:26:28,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-23 02:26:28,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:28,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-23 02:26:28,532 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2021-11-23 02:26:28,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:28,532 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-23 02:26:28,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:28,533 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-23 02:26:28,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:26:28,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:28,534 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:28,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:28,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:28,753 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:28,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:28,754 INFO L85 PathProgramCache]: Analyzing trace with hash 913026693, now seen corresponding path program 2 times [2021-11-23 02:26:28,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:28,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329691958] [2021-11-23 02:26:28,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:28,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:28,820 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:28,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:28,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329691958] [2021-11-23 02:26:28,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329691958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:28,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935688342] [2021-11-23 02:26:28,822 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:28,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:28,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:28,824 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:28,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:26:28,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:26:28,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:28,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:26:28,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:28,923 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:28,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:28,973 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:28,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935688342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:28,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [207050377] [2021-11-23 02:26:28,976 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:28,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:28,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:28,977 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:28,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:29,194 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:29,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:29,428 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:29,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:29,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2021-11-23 02:26:29,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13679369] [2021-11-23 02:26:29,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:29,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:26:29,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:29,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:26:29,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:26:29,431 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2021-11-23 02:26:29,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:29,544 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-11-23 02:26:29,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:26:29,549 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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 10 [2021-11-23 02:26:29,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:29,550 INFO L225 Difference]: With dead ends: 22 [2021-11-23 02:26:29,550 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:26:29,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:26:29,552 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:29,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:26:29,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:26:29,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-23 02:26:29,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2021-11-23 02:26:29,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-23 02:26:29,558 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-11-23 02:26:29,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:29,559 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-23 02:26:29,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2021-11-23 02:26:29,560 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-23 02:26:29,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 02:26:29,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:29,561 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1] [2021-11-23 02:26:29,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:29,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:29,777 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:29,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:29,778 INFO L85 PathProgramCache]: Analyzing trace with hash -44854124, now seen corresponding path program 3 times [2021-11-23 02:26:29,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:29,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984510939] [2021-11-23 02:26:29,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:29,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:29,896 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:29,896 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:29,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984510939] [2021-11-23 02:26:29,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984510939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:29,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839732230] [2021-11-23 02:26:29,897 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:29,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:29,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:29,899 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:29,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:26:29,954 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:29,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:29,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:26:29,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:30,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:30,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:30,113 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:30,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839732230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:30,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429189586] [2021-11-23 02:26:30,117 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:30,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:30,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:30,118 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:30,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:30,297 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:30,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '450#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:30,514 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:30,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:30,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2021-11-23 02:26:30,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016952815] [2021-11-23 02:26:30,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:30,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:26:30,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:30,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:26:30,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:26:30,517 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:30,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:30,613 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-23 02:26:30,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:26:30,614 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 02:26:30,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:30,614 INFO L225 Difference]: With dead ends: 27 [2021-11-23 02:26:30,615 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 02:26:30,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:26:30,616 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:30,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 35 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:30,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 02:26:30,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-23 02:26:30,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:30,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-23 02:26:30,624 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2021-11-23 02:26:30,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:30,624 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-23 02:26:30,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:30,625 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-23 02:26:30,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:26:30,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:30,627 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2021-11-23 02:26:30,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:30,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:30,841 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:30,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:30,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1367622513, now seen corresponding path program 4 times [2021-11-23 02:26:30,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:30,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529021869] [2021-11-23 02:26:30,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:30,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:30,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:30,931 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:30,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:30,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529021869] [2021-11-23 02:26:30,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529021869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:30,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086112526] [2021-11-23 02:26:30,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:30,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:30,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:30,949 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:30,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:26:30,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:30,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:26:31,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:31,062 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:31,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:31,115 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:31,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086112526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:31,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539035827] [2021-11-23 02:26:31,119 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:31,119 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:31,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:31,120 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:31,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:31,298 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:31,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '615#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:31,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:31,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:31,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-23 02:26:31,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16261962] [2021-11-23 02:26:31,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:31,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:26:31,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:31,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:26:31,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:26:31,513 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:31,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:31,634 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-23 02:26:31,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:26:31,635 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-23 02:26:31,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:31,635 INFO L225 Difference]: With dead ends: 26 [2021-11-23 02:26:31,636 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 02:26:31,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:26:31,637 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 17 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:31,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 16 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:31,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 02:26:31,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2021-11-23 02:26:31,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 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) [2021-11-23 02:26:31,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-23 02:26:31,643 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2021-11-23 02:26:31,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:31,644 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-23 02:26:31,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:31,644 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-23 02:26:31,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:26:31,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:31,646 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1] [2021-11-23 02:26:31,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:31,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:31,869 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:31,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:31,869 INFO L85 PathProgramCache]: Analyzing trace with hash -777694646, now seen corresponding path program 5 times [2021-11-23 02:26:31,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:31,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977482749] [2021-11-23 02:26:31,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:31,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:31,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:32,008 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:32,008 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:32,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977482749] [2021-11-23 02:26:32,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977482749] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:32,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598583428] [2021-11-23 02:26:32,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:32,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:32,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:32,021 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:32,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:26:32,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:26:32,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:32,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:26:32,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:32,214 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:32,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:32,294 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:32,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598583428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:32,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1293817324] [2021-11-23 02:26:32,301 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:32,301 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:32,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:32,302 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:32,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:32,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:32,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '811#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:32,713 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:32,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:32,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 15 [2021-11-23 02:26:32,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557092096] [2021-11-23 02:26:32,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:32,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:26:32,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:32,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:26:32,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:26:32,716 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:32,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:32,873 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-23 02:26:32,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:26:32,873 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 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 17 [2021-11-23 02:26:32,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:32,874 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:26:32,874 INFO L226 Difference]: Without dead ends: 19 [2021-11-23 02:26:32,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:26:32,875 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:32,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 38 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:32,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-23 02:26:32,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-23 02:26:32,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:32,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-23 02:26:32,880 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2021-11-23 02:26:32,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:32,881 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-23 02:26:32,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:32,881 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-23 02:26:32,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:26:32,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:32,882 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2021-11-23 02:26:32,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:33,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:26:33,104 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:33,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:33,104 INFO L85 PathProgramCache]: Analyzing trace with hash -499972923, now seen corresponding path program 6 times [2021-11-23 02:26:33,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:33,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317891599] [2021-11-23 02:26:33,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:33,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:33,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:33,245 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:33,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:33,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317891599] [2021-11-23 02:26:33,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317891599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:33,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635658314] [2021-11-23 02:26:33,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:33,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:33,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:33,247 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:33,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:26:33,306 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:33,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:33,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:26:33,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:33,405 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:33,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:33,473 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:33,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635658314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:33,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225212519] [2021-11-23 02:26:33,476 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:33,476 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:33,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:33,477 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:33,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:33,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:33,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1022#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:33,852 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:33,852 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:33,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-23 02:26:33,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86322943] [2021-11-23 02:26:33,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:33,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:26:33,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:33,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:26:33,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:26:33,854 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:33,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:33,988 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-23 02:26:33,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:26:33,989 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 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 18 [2021-11-23 02:26:33,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:33,989 INFO L225 Difference]: With dead ends: 30 [2021-11-23 02:26:33,990 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 02:26:33,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:26:33,991 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 19 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:33,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 11 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:33,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 02:26:33,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-23 02:26:33,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:33,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-11-23 02:26:33,997 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2021-11-23 02:26:33,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:33,997 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-11-23 02:26:33,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:33,998 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-11-23 02:26:33,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 02:26:33,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:33,999 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1] [2021-11-23 02:26:34,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:34,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:34,217 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:34,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:34,218 INFO L85 PathProgramCache]: Analyzing trace with hash 258053716, now seen corresponding path program 7 times [2021-11-23 02:26:34,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:34,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381145102] [2021-11-23 02:26:34,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:34,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:34,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:34,388 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:34,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:34,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381145102] [2021-11-23 02:26:34,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381145102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:34,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823959870] [2021-11-23 02:26:34,389 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:34,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:34,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:34,393 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:34,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:26:34,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:34,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:26:34,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:34,648 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:34,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:34,756 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:34,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823959870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:34,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [655410124] [2021-11-23 02:26:34,764 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:34,768 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:34,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:34,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:34,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:34,934 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:35,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1261#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:35,182 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:35,182 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:35,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2021-11-23 02:26:35,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100434257] [2021-11-23 02:26:35,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:35,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:26:35,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:35,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:26:35,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:26:35,185 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:35,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:35,341 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-23 02:26:35,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:26:35,341 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-23 02:26:35,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:35,342 INFO L225 Difference]: With dead ends: 41 [2021-11-23 02:26:35,342 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 02:26:35,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:26:35,344 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 5 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:35,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 46 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:35,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 02:26:35,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 02:26:35,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:35,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-23 02:26:35,357 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2021-11-23 02:26:35,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:35,357 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-23 02:26:35,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:35,358 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-23 02:26:35,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:26:35,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:35,360 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2021-11-23 02:26:35,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:35,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:35,585 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:35,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:35,586 INFO L85 PathProgramCache]: Analyzing trace with hash -460614833, now seen corresponding path program 8 times [2021-11-23 02:26:35,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:35,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010264419] [2021-11-23 02:26:35,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:35,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:35,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:35,685 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:35,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:35,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010264419] [2021-11-23 02:26:35,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010264419] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:35,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782599261] [2021-11-23 02:26:35,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:35,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:35,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:35,693 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:35,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:26:35,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:26:35,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:35,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:26:35,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:35,845 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:35,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:35,943 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:35,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782599261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:35,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1374296594] [2021-11-23 02:26:35,947 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:35,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:35,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:35,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:35,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:36,088 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:36,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1518#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:36,301 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:36,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:36,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2021-11-23 02:26:36,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801442624] [2021-11-23 02:26:36,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:36,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:26:36,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:36,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:26:36,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:26:36,304 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:36,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:36,468 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-11-23 02:26:36,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:26:36,470 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 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 [2021-11-23 02:26:36,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:36,471 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:26:36,471 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 02:26:36,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:26:36,473 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 22 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:36,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 13 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:36,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 02:26:36,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-11-23 02:26:36,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:36,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-23 02:26:36,488 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-11-23 02:26:36,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:36,488 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-23 02:26:36,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:36,489 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-23 02:26:36,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:26:36,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:36,490 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1] [2021-11-23 02:26:36,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:36,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:26:36,705 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:36,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:36,705 INFO L85 PathProgramCache]: Analyzing trace with hash 248841098, now seen corresponding path program 9 times [2021-11-23 02:26:36,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:36,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420525581] [2021-11-23 02:26:36,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:36,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:36,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:36,870 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:36,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:36,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420525581] [2021-11-23 02:26:36,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420525581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:36,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616629806] [2021-11-23 02:26:36,872 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:36,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:36,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:36,873 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:36,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:26:36,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:36,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:36,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:26:36,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:37,178 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:37,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:37,262 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:37,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616629806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:37,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1138926134] [2021-11-23 02:26:37,264 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:37,264 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:37,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:37,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:37,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:37,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:37,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1800#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:37,664 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:37,664 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:37,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2021-11-23 02:26:37,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615235625] [2021-11-23 02:26:37,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:37,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:26:37,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:37,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:26:37,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:26:37,668 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:37,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:37,840 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-23 02:26:37,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:26:37,841 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 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 25 [2021-11-23 02:26:37,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:37,841 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:26:37,842 INFO L226 Difference]: Without dead ends: 27 [2021-11-23 02:26:37,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=854, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:26:37,844 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:37,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 47 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:37,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-23 02:26:37,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-23 02:26:37,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:37,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-23 02:26:37,850 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2021-11-23 02:26:37,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:37,850 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-23 02:26:37,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:37,851 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-23 02:26:37,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:26:37,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:37,852 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2021-11-23 02:26:37,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:38,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:26:38,065 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:38,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:38,065 INFO L85 PathProgramCache]: Analyzing trace with hash 343018245, now seen corresponding path program 10 times [2021-11-23 02:26:38,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:38,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937598559] [2021-11-23 02:26:38,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:38,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:38,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:38,178 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:38,179 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:38,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937598559] [2021-11-23 02:26:38,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937598559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:38,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321865938] [2021-11-23 02:26:38,180 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:38,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:38,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:38,181 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:38,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:26:38,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:38,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:26:38,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:38,326 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:38,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:38,407 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:38,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321865938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:38,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [100389653] [2021-11-23 02:26:38,411 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:38,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:38,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:38,413 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:38,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:38,549 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:38,761 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2103#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:38,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:38,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:38,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2021-11-23 02:26:38,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498327220] [2021-11-23 02:26:38,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:38,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:26:38,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:38,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:26:38,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:26:38,765 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:38,965 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2021-11-23 02:26:38,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:26:38,966 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 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 26 [2021-11-23 02:26:38,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:38,967 INFO L225 Difference]: With dead ends: 38 [2021-11-23 02:26:38,967 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 02:26:38,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:26:38,969 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 33 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:38,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:38,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 02:26:38,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-11-23 02:26:38,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 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) [2021-11-23 02:26:38,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-11-23 02:26:38,976 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-11-23 02:26:38,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:38,976 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-11-23 02:26:38,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:38,977 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-11-23 02:26:38,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:26:38,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:38,978 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1] [2021-11-23 02:26:39,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:39,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:39,197 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:39,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:39,197 INFO L85 PathProgramCache]: Analyzing trace with hash 1134159892, now seen corresponding path program 11 times [2021-11-23 02:26:39,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:39,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908699568] [2021-11-23 02:26:39,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:39,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:39,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:39,396 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:39,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:39,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908699568] [2021-11-23 02:26:39,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908699568] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:39,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854919176] [2021-11-23 02:26:39,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:39,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:39,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:39,398 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:39,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:26:39,457 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 02:26:39,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:39,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:26:39,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:39,745 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:39,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:39,869 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:39,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854919176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:39,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399883730] [2021-11-23 02:26:39,872 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:39,872 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:39,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:39,873 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:39,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:40,033 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:40,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2428#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:40,277 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:40,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:40,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 24 [2021-11-23 02:26:40,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689827545] [2021-11-23 02:26:40,278 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:40,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:26:40,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:40,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:26:40,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=707, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:26:40,280 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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) [2021-11-23 02:26:40,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:40,493 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-23 02:26:40,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:26:40,493 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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 29 [2021-11-23 02:26:40,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:40,494 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:26:40,494 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 02:26:40,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=256, Invalid=1076, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:26:40,498 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:40,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 58 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:40,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 02:26:40,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-23 02:26:40,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:40,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-23 02:26:40,513 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2021-11-23 02:26:40,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:40,515 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-23 02:26:40,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 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) [2021-11-23 02:26:40,516 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-23 02:26:40,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:26:40,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:40,518 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2021-11-23 02:26:40,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:40,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:40,733 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:40,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:40,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1675576817, now seen corresponding path program 12 times [2021-11-23 02:26:40,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:40,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984310357] [2021-11-23 02:26:40,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:40,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:40,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:40,854 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:40,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:40,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984310357] [2021-11-23 02:26:40,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984310357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:40,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873787727] [2021-11-23 02:26:40,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:40,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:40,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:40,856 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:40,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:26:40,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:40,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:40,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:26:40,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:41,014 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:41,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:41,119 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:41,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873787727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:41,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [984875068] [2021-11-23 02:26:41,122 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:41,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:41,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:41,123 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:41,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:41,251 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:41,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2777#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:41,436 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:41,436 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:41,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2021-11-23 02:26:41,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754212064] [2021-11-23 02:26:41,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:41,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:26:41,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:41,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:26:41,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:26:41,439 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:41,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:41,656 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-11-23 02:26:41,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 02:26:41,657 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 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 30 [2021-11-23 02:26:41,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:41,658 INFO L225 Difference]: With dead ends: 42 [2021-11-23 02:26:41,658 INFO L226 Difference]: Without dead ends: 40 [2021-11-23 02:26:41,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:26:41,666 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 28 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:41,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 13 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:41,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-23 02:26:41,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-11-23 02:26:41,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:41,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-11-23 02:26:41,679 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2021-11-23 02:26:41,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:41,681 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-11-23 02:26:41,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:41,682 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-11-23 02:26:41,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:26:41,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:41,689 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1] [2021-11-23 02:26:41,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:41,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:26:41,910 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:41,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:41,910 INFO L85 PathProgramCache]: Analyzing trace with hash -994220854, now seen corresponding path program 13 times [2021-11-23 02:26:41,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:41,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574012488] [2021-11-23 02:26:41,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:41,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:41,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:42,084 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:42,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:42,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574012488] [2021-11-23 02:26:42,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574012488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:42,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962347358] [2021-11-23 02:26:42,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:42,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:42,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:42,086 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:42,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:26:42,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:42,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:26:42,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:42,455 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:42,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:42,574 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:42,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962347358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:42,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114297147] [2021-11-23 02:26:42,577 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:42,577 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:42,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:42,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:42,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:42,701 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:42,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3145#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:42,956 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:42,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:42,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2021-11-23 02:26:42,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377092493] [2021-11-23 02:26:42,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:42,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:26:42,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:42,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:26:42,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=857, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:26:42,959 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:43,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:43,161 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-23 02:26:43,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:26:43,161 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-23 02:26:43,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:43,162 INFO L225 Difference]: With dead ends: 62 [2021-11-23 02:26:43,162 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 02:26:43,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=317, Invalid=1323, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 02:26:43,165 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 5 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:43,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 61 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:43,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 02:26:43,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-23 02:26:43,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 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) [2021-11-23 02:26:43,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-23 02:26:43,172 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2021-11-23 02:26:43,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:43,173 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-23 02:26:43,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:43,173 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-23 02:26:43,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:26:43,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:43,175 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2021-11-23 02:26:43,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:43,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:26:43,401 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:43,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:43,401 INFO L85 PathProgramCache]: Analyzing trace with hash -112934587, now seen corresponding path program 14 times [2021-11-23 02:26:43,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:43,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873567187] [2021-11-23 02:26:43,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:43,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:43,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:43,555 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:43,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:43,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873567187] [2021-11-23 02:26:43,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873567187] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:43,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031567315] [2021-11-23 02:26:43,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:43,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:43,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:43,558 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:43,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:26:43,632 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 02:26:43,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:43,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:26:43,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:43,734 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:43,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:43,832 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:43,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031567315] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:43,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190081922] [2021-11-23 02:26:43,835 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:43,835 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:43,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:43,836 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:43,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:43,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:44,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3540#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:44,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:44,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:44,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2021-11-23 02:26:44,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250971836] [2021-11-23 02:26:44,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:44,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:26:44,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:44,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:26:44,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:26:44,195 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:44,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:44,418 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-11-23 02:26:44,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 02:26:44,419 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 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 [2021-11-23 02:26:44,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:44,420 INFO L225 Difference]: With dead ends: 46 [2021-11-23 02:26:44,420 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 02:26:44,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=217, Invalid=595, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:26:44,421 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 41 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:44,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 13 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:44,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 02:26:44,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2021-11-23 02:26:44,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 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) [2021-11-23 02:26:44,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-11-23 02:26:44,430 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2021-11-23 02:26:44,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:44,431 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-11-23 02:26:44,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:44,431 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-11-23 02:26:44,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 02:26:44,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:44,432 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1] [2021-11-23 02:26:44,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:44,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:44,649 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:44,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:44,649 INFO L85 PathProgramCache]: Analyzing trace with hash -1470068268, now seen corresponding path program 15 times [2021-11-23 02:26:44,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:44,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344847191] [2021-11-23 02:26:44,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:44,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:44,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:44,860 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:44,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:44,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344847191] [2021-11-23 02:26:44,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344847191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:44,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148913935] [2021-11-23 02:26:44,860 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:44,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:44,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:44,861 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:44,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:26:44,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:44,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:44,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:26:44,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:45,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:45,409 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:45,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148913935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:45,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28442098] [2021-11-23 02:26:45,410 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:45,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:45,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:45,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:45,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:45,544 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:45,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3951#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:45,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:45,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:45,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2021-11-23 02:26:45,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468982841] [2021-11-23 02:26:45,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:45,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:26:45,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:45,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:26:45,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1021, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:26:45,799 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 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) [2021-11-23 02:26:46,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:46,059 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-11-23 02:26:46,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 02:26:46,059 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 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 37 [2021-11-23 02:26:46,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:46,060 INFO L225 Difference]: With dead ends: 69 [2021-11-23 02:26:46,060 INFO L226 Difference]: Without dead ends: 39 [2021-11-23 02:26:46,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=385, Invalid=1595, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:26:46,062 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 5 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:46,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:46,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-23 02:26:46,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-23 02:26:46,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:46,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-11-23 02:26:46,076 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 37 [2021-11-23 02:26:46,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:46,077 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-11-23 02:26:46,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 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) [2021-11-23 02:26:46,078 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-11-23 02:26:46,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:26:46,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:46,084 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2021-11-23 02:26:46,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:46,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:26:46,313 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:46,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:46,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1486827727, now seen corresponding path program 16 times [2021-11-23 02:26:46,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:46,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116940645] [2021-11-23 02:26:46,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:46,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:46,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:46,456 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:46,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:46,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116940645] [2021-11-23 02:26:46,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116940645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:46,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807971277] [2021-11-23 02:26:46,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:46,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:46,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:46,459 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:46,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:26:46,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:46,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 02:26:46,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:46,645 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:46,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:46,742 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:46,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807971277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:46,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91737503] [2021-11-23 02:26:46,745 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:46,745 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:46,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:46,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:46,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:46,872 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:47,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4392#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:47,111 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:47,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:47,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2021-11-23 02:26:47,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359922227] [2021-11-23 02:26:47,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:47,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:26:47,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:47,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:26:47,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:26:47,114 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:47,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:47,323 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-11-23 02:26:47,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:26:47,324 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 02:26:47,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:47,324 INFO L225 Difference]: With dead ends: 50 [2021-11-23 02:26:47,324 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 02:26:47,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=252, Invalid=678, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:26:47,326 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 26 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:47,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 16 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:47,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 02:26:47,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-11-23 02:26:47,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:47,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-11-23 02:26:47,332 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-11-23 02:26:47,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:47,333 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-11-23 02:26:47,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:47,333 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-11-23 02:26:47,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:26:47,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:47,334 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1] [2021-11-23 02:26:47,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:47,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:26:47,537 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:47,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:47,537 INFO L85 PathProgramCache]: Analyzing trace with hash 91911690, now seen corresponding path program 17 times [2021-11-23 02:26:47,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:47,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686474192] [2021-11-23 02:26:47,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:47,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:47,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:47,792 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:47,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:47,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686474192] [2021-11-23 02:26:47,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686474192] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:47,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351729524] [2021-11-23 02:26:47,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:47,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:47,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:47,800 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:47,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:26:47,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 02:26:47,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:47,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:26:47,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:48,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:48,436 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:48,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351729524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:48,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428801988] [2021-11-23 02:26:48,439 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:48,439 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:48,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:48,440 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:48,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:48,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:48,893 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4846#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:48,893 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:48,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:48,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2021-11-23 02:26:48,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766131899] [2021-11-23 02:26:48,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:48,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 02:26:48,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:48,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 02:26:48,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:26:48,896 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:49,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:49,226 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-23 02:26:49,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:26:49,227 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 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 41 [2021-11-23 02:26:49,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:49,227 INFO L225 Difference]: With dead ends: 76 [2021-11-23 02:26:49,228 INFO L226 Difference]: Without dead ends: 43 [2021-11-23 02:26:49,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=460, Invalid=1892, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 02:26:49,230 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:49,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 105 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:49,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-23 02:26:49,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-23 02:26:49,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:49,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-11-23 02:26:49,246 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2021-11-23 02:26:49,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:49,246 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-11-23 02:26:49,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:49,247 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-11-23 02:26:49,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:26:49,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:49,248 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2021-11-23 02:26:49,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:49,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:49,453 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:49,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:49,453 INFO L85 PathProgramCache]: Analyzing trace with hash -1748555899, now seen corresponding path program 18 times [2021-11-23 02:26:49,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:49,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562291231] [2021-11-23 02:26:49,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:49,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:49,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:49,626 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:49,627 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:49,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562291231] [2021-11-23 02:26:49,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562291231] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:49,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338982413] [2021-11-23 02:26:49,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:49,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:49,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:49,629 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:49,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:26:49,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:49,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:49,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:26:49,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:49,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:49,968 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:49,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338982413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:49,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1073961753] [2021-11-23 02:26:49,970 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:49,971 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:49,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:49,971 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:49,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:50,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:50,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5333#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:50,337 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:50,337 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:50,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2021-11-23 02:26:50,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388783695] [2021-11-23 02:26:50,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:50,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:26:50,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:50,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:26:50,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=313, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:26:50,340 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:50,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:50,612 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-11-23 02:26:50,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 02:26:50,612 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 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 42 [2021-11-23 02:26:50,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:50,613 INFO L225 Difference]: With dead ends: 54 [2021-11-23 02:26:50,613 INFO L226 Difference]: Without dead ends: 52 [2021-11-23 02:26:50,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=290, Invalid=766, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:26:50,615 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 39 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:50,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 11 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:50,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-23 02:26:50,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2021-11-23 02:26:50,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 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) [2021-11-23 02:26:50,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-11-23 02:26:50,632 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2021-11-23 02:26:50,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:50,634 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-11-23 02:26:50,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:50,635 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-11-23 02:26:50,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:26:50,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:50,636 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1] [2021-11-23 02:26:50,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:50,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:50,853 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:50,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:50,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1860600940, now seen corresponding path program 19 times [2021-11-23 02:26:50,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:50,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849520236] [2021-11-23 02:26:50,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:50,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:50,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:51,142 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:51,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:51,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849520236] [2021-11-23 02:26:51,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849520236] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:51,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965195830] [2021-11-23 02:26:51,144 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:51,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:51,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:51,147 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:51,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:26:51,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:51,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:26:51,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:51,628 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:51,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:51,801 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:51,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965195830] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:51,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1389817391] [2021-11-23 02:26:51,803 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:51,803 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:51,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:51,803 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:51,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:51,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:52,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5830#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:52,153 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:52,153 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:52,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 36 [2021-11-23 02:26:52,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751512281] [2021-11-23 02:26:52,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:52,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:26:52,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:52,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:26:52,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=1391, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:26:52,156 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:52,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:52,475 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-23 02:26:52,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:26:52,475 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 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 45 [2021-11-23 02:26:52,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:52,476 INFO L225 Difference]: With dead ends: 83 [2021-11-23 02:26:52,476 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 02:26:52,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=542, Invalid=2214, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:26:52,478 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:52,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 107 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:52,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 02:26:52,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-23 02:26:52,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:52,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-23 02:26:52,487 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2021-11-23 02:26:52,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:52,488 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-23 02:26:52,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:52,488 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-23 02:26:52,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:26:52,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:52,489 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2021-11-23 02:26:52,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:52,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 02:26:52,713 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:52,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:52,713 INFO L85 PathProgramCache]: Analyzing trace with hash -496306289, now seen corresponding path program 20 times [2021-11-23 02:26:52,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:52,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889699042] [2021-11-23 02:26:52,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:52,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:52,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 55 proven. 166 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:52,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:52,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889699042] [2021-11-23 02:26:52,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889699042] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:52,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283415525] [2021-11-23 02:26:52,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:52,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:52,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:52,882 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:52,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:26:52,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 02:26:52,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:52,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:26:52,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:53,093 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:53,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:53,231 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:53,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283415525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:53,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184489539] [2021-11-23 02:26:53,234 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:53,234 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:53,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:53,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:53,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:53,325 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:53,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6363#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:53,560 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:53,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:53,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2021-11-23 02:26:53,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990915849] [2021-11-23 02:26:53,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:53,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:26:53,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:53,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:26:53,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:26:53,561 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:53,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:53,807 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-11-23 02:26:53,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 02:26:53,810 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 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 46 [2021-11-23 02:26:53,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:53,810 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:26:53,811 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 02:26:53,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=331, Invalid=859, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:26:53,813 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 42 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:53,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 11 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:53,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 02:26:53,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-11-23 02:26:53,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 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) [2021-11-23 02:26:53,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-11-23 02:26:53,822 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2021-11-23 02:26:53,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:53,823 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-11-23 02:26:53,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:53,823 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-11-23 02:26:53,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:26:53,824 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:53,824 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1] [2021-11-23 02:26:53,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:54,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 02:26:54,033 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:54,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:54,033 INFO L85 PathProgramCache]: Analyzing trace with hash 2116564810, now seen corresponding path program 21 times [2021-11-23 02:26:54,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:54,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62880100] [2021-11-23 02:26:54,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:54,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:54,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:54,392 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:54,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:54,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62880100] [2021-11-23 02:26:54,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62880100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:54,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190079456] [2021-11-23 02:26:54,393 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:54,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:54,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:54,397 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:54,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:26:54,467 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:26:54,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:54,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:26:54,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:54,969 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:54,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:55,141 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:55,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190079456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:55,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844157785] [2021-11-23 02:26:55,143 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:55,143 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:55,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:55,144 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:55,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:55,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:55,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6903#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:55,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:55,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:55,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2021-11-23 02:26:55,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975022945] [2021-11-23 02:26:55,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:55,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 02:26:55,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:55,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 02:26:55,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=1597, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:26:55,597 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:55,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:55,978 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-11-23 02:26:55,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:26:55,978 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 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 49 [2021-11-23 02:26:55,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:55,979 INFO L225 Difference]: With dead ends: 90 [2021-11-23 02:26:55,979 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:26:55,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:26:55,981 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 5 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:55,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 139 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:55,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:26:55,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-23 02:26:55,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 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) [2021-11-23 02:26:55,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-11-23 02:26:55,989 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 49 [2021-11-23 02:26:55,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:55,990 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-11-23 02:26:55,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:55,991 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-11-23 02:26:55,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:26:55,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:55,992 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2021-11-23 02:26:56,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-23 02:26:56,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:56,192 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:56,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:56,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1844101691, now seen corresponding path program 22 times [2021-11-23 02:26:56,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:56,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292567676] [2021-11-23 02:26:56,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:56,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:56,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:56,388 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 66 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:56,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:56,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292567676] [2021-11-23 02:26:56,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292567676] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:56,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077637947] [2021-11-23 02:26:56,389 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:26:56,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:56,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:56,390 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:56,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:26:56,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:56,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:26:56,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:56,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:56,729 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:56,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077637947] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:56,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1401502153] [2021-11-23 02:26:56,733 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:56,733 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:56,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:56,734 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:56,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:56,844 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:57,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7482#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:57,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:57,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:57,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 17 [2021-11-23 02:26:57,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063281083] [2021-11-23 02:26:57,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:57,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:26:57,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:57,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:26:57,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:26:57,022 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:57,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:57,280 INFO L93 Difference]: Finished difference Result 62 states and 63 transitions. [2021-11-23 02:26:57,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:26:57,281 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 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 50 [2021-11-23 02:26:57,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:57,281 INFO L225 Difference]: With dead ends: 62 [2021-11-23 02:26:57,281 INFO L226 Difference]: Without dead ends: 60 [2021-11-23 02:26:57,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=375, Invalid=957, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:26:57,283 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 45 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:57,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 20 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:57,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-23 02:26:57,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-23 02:26:57,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 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) [2021-11-23 02:26:57,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-23 02:26:57,291 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2021-11-23 02:26:57,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:57,292 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-23 02:26:57,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:57,292 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-23 02:26:57,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:26:57,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:57,293 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1] [2021-11-23 02:26:57,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-23 02:26:57,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:57,509 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:57,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:57,509 INFO L85 PathProgramCache]: Analyzing trace with hash -701973164, now seen corresponding path program 23 times [2021-11-23 02:26:57,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:57,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886528179] [2021-11-23 02:26:57,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:57,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:57,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:57,860 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:57,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:57,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886528179] [2021-11-23 02:26:57,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886528179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:57,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181139424] [2021-11-23 02:26:57,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:26:57,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:57,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:57,862 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:57,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:26:57,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-23 02:26:57,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:26:57,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 02:26:57,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:58,475 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:58,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:58,662 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:58,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181139424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:58,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [133255778] [2021-11-23 02:26:58,664 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:26:58,664 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:58,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:58,665 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:58,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:58,768 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:59,041 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8065#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:59,041 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:59,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:59,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 42 [2021-11-23 02:26:59,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237431458] [2021-11-23 02:26:59,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:59,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:26:59,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:59,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:26:59,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=1817, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:26:59,044 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:59,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:59,454 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-11-23 02:26:59,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 02:26:59,454 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 02:26:59,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:59,455 INFO L225 Difference]: With dead ends: 97 [2021-11-23 02:26:59,455 INFO L226 Difference]: Without dead ends: 55 [2021-11-23 02:26:59,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=727, Invalid=2933, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:26:59,458 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:59,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 130 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:26:59,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-23 02:26:59,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-23 02:26:59,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:59,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-11-23 02:26:59,468 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2021-11-23 02:26:59,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:59,468 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-11-23 02:26:59,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:26:59,469 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-11-23 02:26:59,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:26:59,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:59,470 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2021-11-23 02:26:59,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:26:59,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:26:59,693 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:59,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:59,693 INFO L85 PathProgramCache]: Analyzing trace with hash -2031612337, now seen corresponding path program 24 times [2021-11-23 02:26:59,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:59,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873907398] [2021-11-23 02:26:59,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:59,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:59,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:59,931 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 78 proven. 235 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:59,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:59,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873907398] [2021-11-23 02:26:59,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873907398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:59,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684809222] [2021-11-23 02:26:59,932 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:26:59,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:59,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:59,937 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:59,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 02:27:00,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:00,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:00,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:27:00,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:00,195 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:00,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:00,326 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:00,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684809222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:00,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1385939877] [2021-11-23 02:27:00,328 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:00,328 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:00,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:00,329 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:00,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:00,466 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:00,706 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8690#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:00,706 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:00,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:00,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 18 [2021-11-23 02:27:00,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521131122] [2021-11-23 02:27:00,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:00,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:27:00,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:00,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:27:00,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:27:00,708 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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) [2021-11-23 02:27:01,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:01,006 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2021-11-23 02:27:01,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 02:27:01,007 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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 54 [2021-11-23 02:27:01,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:01,008 INFO L225 Difference]: With dead ends: 66 [2021-11-23 02:27:01,008 INFO L226 Difference]: Without dead ends: 64 [2021-11-23 02:27:01,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=422, Invalid=1060, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:27:01,010 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 46 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:01,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 13 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:01,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-23 02:27:01,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 58. [2021-11-23 02:27:01,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 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) [2021-11-23 02:27:01,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-11-23 02:27:01,020 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2021-11-23 02:27:01,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:01,020 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-11-23 02:27:01,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 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) [2021-11-23 02:27:01,021 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-11-23 02:27:01,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:27:01,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:01,022 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1] [2021-11-23 02:27:01,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:01,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 02:27:01,245 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:01,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:01,245 INFO L85 PathProgramCache]: Analyzing trace with hash 920823946, now seen corresponding path program 25 times [2021-11-23 02:27:01,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:01,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165934868] [2021-11-23 02:27:01,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:01,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:01,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:01,706 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:01,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:01,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165934868] [2021-11-23 02:27:01,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165934868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:01,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580305774] [2021-11-23 02:27:01,707 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:01,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:01,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:01,709 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:01,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 02:27:01,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:01,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:27:01,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:02,487 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:02,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:02,624 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:02,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580305774] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:02,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006699684] [2021-11-23 02:27:02,626 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:02,627 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:02,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:02,627 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:02,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:02,749 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:03,088 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9316#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:03,089 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:03,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:03,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2021-11-23 02:27:03,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056406419] [2021-11-23 02:27:03,089 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:03,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 02:27:03,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:03,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 02:27:03,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=2051, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 02:27:03,095 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:03,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:03,530 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2021-11-23 02:27:03,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 02:27:03,530 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 02:27:03,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:03,531 INFO L225 Difference]: With dead ends: 104 [2021-11-23 02:27:03,531 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 02:27:03,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1020 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=830, Invalid=3330, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:27:03,534 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 5 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:03,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 138 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:03,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 02:27:03,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-23 02:27:03,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:03,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-23 02:27:03,542 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 57 [2021-11-23 02:27:03,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:03,543 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-23 02:27:03,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:03,543 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-23 02:27:03,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:27:03,543 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:03,544 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2021-11-23 02:27:03,577 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-23 02:27:03,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:03,744 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:03,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:03,745 INFO L85 PathProgramCache]: Analyzing trace with hash -448068603, now seen corresponding path program 26 times [2021-11-23 02:27:03,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:03,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240162846] [2021-11-23 02:27:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:03,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:03,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:03,986 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 91 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:03,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:03,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240162846] [2021-11-23 02:27:03,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240162846] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:03,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215433466] [2021-11-23 02:27:03,987 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:03,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:03,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:03,989 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:04,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 02:27:04,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-23 02:27:04,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:04,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 02:27:04,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:04,251 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:04,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:04,406 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:04,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215433466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:04,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645452612] [2021-11-23 02:27:04,409 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:04,409 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:04,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:04,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:04,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:04,507 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:04,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9987#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:04,708 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:04,708 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:04,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 19 [2021-11-23 02:27:04,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892770497] [2021-11-23 02:27:04,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:04,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:27:04,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:04,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:27:04,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=435, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:27:04,710 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:05,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:05,062 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2021-11-23 02:27:05,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 02:27:05,063 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 02:27:05,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:05,064 INFO L225 Difference]: With dead ends: 70 [2021-11-23 02:27:05,064 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 02:27:05,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=472, Invalid=1168, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 02:27:05,066 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 55 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:05,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 14 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:05,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 02:27:05,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2021-11-23 02:27:05,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 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) [2021-11-23 02:27:05,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-11-23 02:27:05,072 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2021-11-23 02:27:05,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:05,072 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-11-23 02:27:05,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:05,073 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-11-23 02:27:05,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:27:05,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:05,074 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1] [2021-11-23 02:27:05,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:05,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:27:05,287 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:05,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:05,287 INFO L85 PathProgramCache]: Analyzing trace with hash 351424276, now seen corresponding path program 27 times [2021-11-23 02:27:05,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:05,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872573048] [2021-11-23 02:27:05,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:05,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:05,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:05,774 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:05,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:05,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872573048] [2021-11-23 02:27:05,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872573048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:05,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435462563] [2021-11-23 02:27:05,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:05,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:05,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:05,779 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:05,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 02:27:05,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:05,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:05,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 02:27:05,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:06,617 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:06,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:06,782 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:06,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435462563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:06,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1723505423] [2021-11-23 02:27:06,784 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:06,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:06,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:06,785 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:06,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:06,898 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:07,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10656#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:07,285 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:07,285 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:07,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 48 [2021-11-23 02:27:07,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144420141] [2021-11-23 02:27:07,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:07,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 02:27:07,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:07,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 02:27:07,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=2299, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:27:07,289 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) [2021-11-23 02:27:07,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:07,737 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2021-11-23 02:27:07,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 02:27:07,737 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) Word has length 61 [2021-11-23 02:27:07,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:07,738 INFO L225 Difference]: With dead ends: 111 [2021-11-23 02:27:07,738 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 02:27:07,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=940, Invalid=3752, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 02:27:07,741 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 5 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:07,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 166 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:07,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 02:27:07,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-23 02:27:07,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:07,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-11-23 02:27:07,752 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 61 [2021-11-23 02:27:07,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:07,752 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-11-23 02:27:07,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 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) [2021-11-23 02:27:07,753 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-11-23 02:27:07,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:27:07,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:07,754 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2021-11-23 02:27:07,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:07,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:27:07,981 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:07,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:07,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1484420367, now seen corresponding path program 28 times [2021-11-23 02:27:07,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:07,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190934569] [2021-11-23 02:27:07,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:07,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:08,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:08,256 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 105 proven. 316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:08,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:08,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190934569] [2021-11-23 02:27:08,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190934569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:08,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212181887] [2021-11-23 02:27:08,257 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:08,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:08,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:08,261 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:08,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 02:27:08,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:08,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 02:27:08,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:08,553 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:08,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:08,760 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:08,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212181887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:08,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1629406956] [2021-11-23 02:27:08,763 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:08,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:08,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:08,764 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:08,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:08,856 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:09,064 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11373#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:09,064 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:09,064 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:09,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 20 [2021-11-23 02:27:09,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82286939] [2021-11-23 02:27:09,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:09,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 02:27:09,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:09,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 02:27:09,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:27:09,066 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:09,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:09,397 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-11-23 02:27:09,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 02:27:09,397 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 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 62 [2021-11-23 02:27:09,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:09,398 INFO L225 Difference]: With dead ends: 74 [2021-11-23 02:27:09,398 INFO L226 Difference]: Without dead ends: 72 [2021-11-23 02:27:09,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 190 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=525, Invalid=1281, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:27:09,399 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 39 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:09,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 16 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:09,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-23 02:27:09,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2021-11-23 02:27:09,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:09,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-23 02:27:09,429 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2021-11-23 02:27:09,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:09,430 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-23 02:27:09,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:09,430 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-23 02:27:09,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:27:09,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:09,431 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1] [2021-11-23 02:27:09,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:09,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:09,632 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:09,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:09,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1388693962, now seen corresponding path program 29 times [2021-11-23 02:27:09,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:09,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497556402] [2021-11-23 02:27:09,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:09,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:09,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:10,192 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:10,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:10,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497556402] [2021-11-23 02:27:10,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497556402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:10,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282777729] [2021-11-23 02:27:10,193 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:10,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:10,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:10,197 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:10,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 02:27:10,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-23 02:27:10,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:10,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 02:27:10,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:11,200 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:11,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:11,402 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:11,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282777729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:11,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843956478] [2021-11-23 02:27:11,403 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:11,404 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:11,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:11,404 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:11,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:11,501 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:11,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12085#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:11,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:11,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:11,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 51 [2021-11-23 02:27:11,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071824837] [2021-11-23 02:27:11,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:11,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 02:27:11,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:11,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 02:27:11,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:27:11,779 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:12,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:12,266 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-11-23 02:27:12,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:27:12,266 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-23 02:27:12,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:12,267 INFO L225 Difference]: With dead ends: 118 [2021-11-23 02:27:12,267 INFO L226 Difference]: Without dead ends: 67 [2021-11-23 02:27:12,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1057, Invalid=4199, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:27:12,269 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 5 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:12,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 166 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:12,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-23 02:27:12,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-23 02:27:12,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:12,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-11-23 02:27:12,277 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2021-11-23 02:27:12,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:12,277 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-11-23 02:27:12,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:12,277 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-11-23 02:27:12,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:27:12,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:12,278 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2021-11-23 02:27:12,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:12,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-23 02:27:12,481 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:12,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:12,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1450935739, now seen corresponding path program 30 times [2021-11-23 02:27:12,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:12,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773589627] [2021-11-23 02:27:12,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:12,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:12,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:12,786 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 120 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:12,786 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:12,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773589627] [2021-11-23 02:27:12,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773589627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:12,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058468669] [2021-11-23 02:27:12,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:12,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:12,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:12,788 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:12,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 02:27:12,877 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:12,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:12,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 02:27:12,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:13,040 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:13,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:13,202 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:13,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058468669] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:13,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503045651] [2021-11-23 02:27:13,203 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:13,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:13,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:13,204 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:13,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:13,310 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:13,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12848#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:13,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:13,496 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:13,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 21 [2021-11-23 02:27:13,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547888829] [2021-11-23 02:27:13,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:13,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:27:13,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:13,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:27:13,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=502, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:27:13,498 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:13,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:13,814 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-23 02:27:13,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 02:27:13,814 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 02:27:13,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:13,815 INFO L225 Difference]: With dead ends: 78 [2021-11-23 02:27:13,815 INFO L226 Difference]: Without dead ends: 76 [2021-11-23 02:27:13,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=581, Invalid=1399, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:27:13,823 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 56 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:13,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 15 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:13,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-23 02:27:13,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2021-11-23 02:27:13,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 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) [2021-11-23 02:27:13,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-11-23 02:27:13,835 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2021-11-23 02:27:13,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:13,835 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-11-23 02:27:13,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 21 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:13,836 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-11-23 02:27:13,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 02:27:13,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:13,837 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1] [2021-11-23 02:27:13,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-23 02:27:14,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-23 02:27:14,053 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:14,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:14,053 INFO L85 PathProgramCache]: Analyzing trace with hash -270913324, now seen corresponding path program 31 times [2021-11-23 02:27:14,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:14,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720205813] [2021-11-23 02:27:14,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:14,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:14,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:14,656 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:14,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:14,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720205813] [2021-11-23 02:27:14,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720205813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:14,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772193888] [2021-11-23 02:27:14,657 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:14,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:14,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:14,661 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:14,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 02:27:14,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:14,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 02:27:14,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:15,583 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:15,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:15,752 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:15,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772193888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:15,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722251012] [2021-11-23 02:27:15,754 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:15,754 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:15,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:15,755 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:15,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:15,862 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:16,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13603#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:16,221 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:16,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:16,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 54 [2021-11-23 02:27:16,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939403141] [2021-11-23 02:27:16,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:16,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:27:16,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:16,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:27:16,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=2837, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:27:16,223 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:16,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:16,762 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2021-11-23 02:27:16,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 02:27:16,762 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 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 69 [2021-11-23 02:27:16,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:16,763 INFO L225 Difference]: With dead ends: 125 [2021-11-23 02:27:16,763 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 02:27:16,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1419 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1181, Invalid=4671, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 02:27:16,765 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:16,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 200 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:16,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 02:27:16,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-23 02:27:16,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:16,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-11-23 02:27:16,790 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 69 [2021-11-23 02:27:16,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:16,790 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-11-23 02:27:16,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:16,791 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-11-23 02:27:16,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 02:27:16,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:16,791 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2021-11-23 02:27:16,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:16,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-23 02:27:16,992 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:16,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:16,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1854286799, now seen corresponding path program 32 times [2021-11-23 02:27:16,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:16,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399802270] [2021-11-23 02:27:16,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:16,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:17,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:17,288 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 136 proven. 409 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:17,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:17,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399802270] [2021-11-23 02:27:17,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399802270] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:17,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410535936] [2021-11-23 02:27:17,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:17,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:17,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:17,293 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:17,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 02:27:17,402 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-23 02:27:17,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:17,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 02:27:17,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:17,598 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:17,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:17,782 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 153 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:17,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410535936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:17,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2002286279] [2021-11-23 02:27:17,791 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:17,791 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:17,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:17,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:17,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:17,895 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:18,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14412#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:18,104 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:18,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:18,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 22 [2021-11-23 02:27:18,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63671347] [2021-11-23 02:27:18,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:18,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:27:18,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:18,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:27:18,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:27:18,106 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:18,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:18,467 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2021-11-23 02:27:18,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 02:27:18,467 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-23 02:27:18,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:18,468 INFO L225 Difference]: With dead ends: 82 [2021-11-23 02:27:18,468 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 02:27:18,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 216 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=640, Invalid=1522, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:27:18,469 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 43 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:18,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 18 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:18,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 02:27:18,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2021-11-23 02:27:18,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:18,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-11-23 02:27:18,481 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2021-11-23 02:27:18,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:18,481 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-11-23 02:27:18,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:18,481 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-11-23 02:27:18,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:27:18,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:18,482 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1] [2021-11-23 02:27:18,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 02:27:18,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:18,683 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:18,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:18,684 INFO L85 PathProgramCache]: Analyzing trace with hash -806511862, now seen corresponding path program 33 times [2021-11-23 02:27:18,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:18,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844270314] [2021-11-23 02:27:18,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:18,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:18,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:19,362 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:19,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:19,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844270314] [2021-11-23 02:27:19,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [844270314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:19,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763050845] [2021-11-23 02:27:19,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:19,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:19,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:19,364 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:19,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 02:27:19,457 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:19,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:19,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:27:19,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:20,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:20,679 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:20,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763050845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:20,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102043829] [2021-11-23 02:27:20,681 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:20,681 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:20,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:20,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:20,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:20,763 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:21,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15210#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:21,058 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:21,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:21,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 57 [2021-11-23 02:27:21,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566484042] [2021-11-23 02:27:21,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:21,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-23 02:27:21,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:21,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-23 02:27:21,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=779, Invalid=3127, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 02:27:21,060 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:21,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:21,731 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-11-23 02:27:21,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 02:27:21,732 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 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 73 [2021-11-23 02:27:21,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:21,733 INFO L225 Difference]: With dead ends: 132 [2021-11-23 02:27:21,733 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 02:27:21,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1566 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1312, Invalid=5168, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 02:27:21,735 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:21,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 191 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:21,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 02:27:21,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 02:27:21,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:21,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-11-23 02:27:21,747 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 73 [2021-11-23 02:27:21,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:21,748 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-11-23 02:27:21,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.2758620689655173) internal successors, (132), 57 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:21,748 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-11-23 02:27:21,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 02:27:21,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:21,749 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2021-11-23 02:27:21,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:21,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:21,977 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:21,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:21,977 INFO L85 PathProgramCache]: Analyzing trace with hash -774004603, now seen corresponding path program 34 times [2021-11-23 02:27:21,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:21,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052646276] [2021-11-23 02:27:21,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:21,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 153 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:22,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:22,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052646276] [2021-11-23 02:27:22,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052646276] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:22,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747249445] [2021-11-23 02:27:22,314 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:22,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:22,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:22,316 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:22,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 02:27:22,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:22,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 02:27:22,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:22,654 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:22,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 171 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:22,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747249445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:22,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [5884223] [2021-11-23 02:27:22,908 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:22,908 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:22,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:22,909 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:22,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:23,025 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:23,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16065#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:23,285 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:23,285 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:23,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 23 [2021-11-23 02:27:23,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144526035] [2021-11-23 02:27:23,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:23,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:27:23,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:23,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:27:23,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:27:23,288 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:23,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:23,655 INFO L93 Difference]: Finished difference Result 86 states and 87 transitions. [2021-11-23 02:27:23,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 02:27:23,656 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 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 74 [2021-11-23 02:27:23,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:23,656 INFO L225 Difference]: With dead ends: 86 [2021-11-23 02:27:23,657 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 02:27:23,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 229 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=702, Invalid=1650, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 02:27:23,658 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 43 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:23,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 18 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:23,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 02:27:23,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 78. [2021-11-23 02:27:23,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 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) [2021-11-23 02:27:23,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-11-23 02:27:23,670 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2021-11-23 02:27:23,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:23,671 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-11-23 02:27:23,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:23,671 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-11-23 02:27:23,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:27:23,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:23,672 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1] [2021-11-23 02:27:23,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:23,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-23 02:27:23,881 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:23,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:23,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1313104532, now seen corresponding path program 35 times [2021-11-23 02:27:23,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:23,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803409933] [2021-11-23 02:27:23,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:23,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:23,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:24,623 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:24,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:24,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803409933] [2021-11-23 02:27:24,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803409933] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:24,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230519858] [2021-11-23 02:27:24,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:24,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:24,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:24,626 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:24,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 02:27:24,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-23 02:27:24,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:24,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 02:27:24,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:25,774 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:25,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:25,974 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:25,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230519858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:25,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1745919572] [2021-11-23 02:27:25,976 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:25,976 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:25,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:25,976 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:25,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:26,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:26,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16906#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:26,410 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:26,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:26,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 60 [2021-11-23 02:27:26,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453044704] [2021-11-23 02:27:26,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:26,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-23 02:27:26,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:26,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-23 02:27:26,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=859, Invalid=3431, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:27:26,413 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 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) [2021-11-23 02:27:27,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:27,006 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2021-11-23 02:27:27,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 02:27:27,006 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 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 77 [2021-11-23 02:27:27,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:27,007 INFO L225 Difference]: With dead ends: 139 [2021-11-23 02:27:27,007 INFO L226 Difference]: Without dead ends: 79 [2021-11-23 02:27:27,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1720 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1450, Invalid=5690, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 02:27:27,017 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:27,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 185 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:27,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-23 02:27:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-23 02:27:27,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:27,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-11-23 02:27:27,032 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2021-11-23 02:27:27,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:27,032 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-11-23 02:27:27,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.278688524590164) internal successors, (139), 60 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) [2021-11-23 02:27:27,033 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-11-23 02:27:27,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:27:27,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:27,034 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2021-11-23 02:27:27,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:27,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-23 02:27:27,247 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:27,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:27,247 INFO L85 PathProgramCache]: Analyzing trace with hash 628044431, now seen corresponding path program 36 times [2021-11-23 02:27:27,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:27,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861700111] [2021-11-23 02:27:27,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:27,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:27,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:27,596 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 171 proven. 514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:27,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:27,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861700111] [2021-11-23 02:27:27,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861700111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:27,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864333953] [2021-11-23 02:27:27,597 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:27,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:27,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:27,601 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:27,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 02:27:27,695 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:27,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:27,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 02:27:27,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:27,951 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:27,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:28,205 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 190 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:28,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864333953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:28,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1788582678] [2021-11-23 02:27:28,207 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:28,208 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:28,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:28,208 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:28,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:28,327 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:28,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17807#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:28,553 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:28,553 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:28,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 24 [2021-11-23 02:27:28,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972228351] [2021-11-23 02:27:28,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:28,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:27:28,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:28,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:27:28,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=610, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:27:28,555 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:28,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:28,932 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2021-11-23 02:27:28,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 02:27:28,933 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-23 02:27:28,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:28,934 INFO L225 Difference]: With dead ends: 90 [2021-11-23 02:27:28,934 INFO L226 Difference]: Without dead ends: 88 [2021-11-23 02:27:28,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 242 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1783, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 02:27:28,935 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 88 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:28,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 13 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:28,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-23 02:27:28,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2021-11-23 02:27:28,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:28,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-11-23 02:27:28,950 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2021-11-23 02:27:28,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:28,951 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-11-23 02:27:28,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:28,951 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-11-23 02:27:28,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:27:28,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:28,952 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1] [2021-11-23 02:27:28,979 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 02:27:29,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-23 02:27:29,157 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:29,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:29,157 INFO L85 PathProgramCache]: Analyzing trace with hash 1198922826, now seen corresponding path program 37 times [2021-11-23 02:27:29,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:29,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941563477] [2021-11-23 02:27:29,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:29,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:29,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:29,832 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:29,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:29,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941563477] [2021-11-23 02:27:29,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941563477] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:29,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111140379] [2021-11-23 02:27:29,832 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:29,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:29,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:29,834 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:29,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 02:27:29,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:29,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 02:27:29,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:30,998 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:30,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:31,211 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:31,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111140379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:31,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120372093] [2021-11-23 02:27:31,213 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:31,213 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:31,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:31,213 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:31,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:31,335 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:31,758 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18691#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:31,758 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:31,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:31,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 63 [2021-11-23 02:27:31,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938981348] [2021-11-23 02:27:31,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:31,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 02:27:31,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:31,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 02:27:31,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=943, Invalid=3749, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 02:27:31,761 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:32,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:32,545 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-11-23 02:27:32,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 02:27:32,546 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 02:27:32,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:32,547 INFO L225 Difference]: With dead ends: 146 [2021-11-23 02:27:32,547 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 02:27:32,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1881 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1595, Invalid=6237, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 02:27:32,550 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:32,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 215 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:32,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 02:27:32,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-23 02:27:32,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:32,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-11-23 02:27:32,568 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 81 [2021-11-23 02:27:32,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:32,568 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-11-23 02:27:32,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.28125) internal successors, (146), 63 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:32,569 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-11-23 02:27:32,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 02:27:32,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:32,570 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2021-11-23 02:27:32,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:32,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-23 02:27:32,784 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:32,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:32,784 INFO L85 PathProgramCache]: Analyzing trace with hash -328042811, now seen corresponding path program 38 times [2021-11-23 02:27:32,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:32,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90013543] [2021-11-23 02:27:32,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:32,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:32,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:33,138 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 190 proven. 571 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:33,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:33,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90013543] [2021-11-23 02:27:33,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90013543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:33,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802140829] [2021-11-23 02:27:33,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:33,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:33,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:33,140 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:33,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 02:27:33,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-23 02:27:33,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:33,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-23 02:27:33,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:33,442 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:33,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:33,644 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 210 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:33,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802140829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:33,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451985719] [2021-11-23 02:27:33,645 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:33,645 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:33,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:33,645 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:33,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:33,772 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:33,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19638#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:33,986 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:33,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:33,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 25 [2021-11-23 02:27:33,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130008842] [2021-11-23 02:27:33,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:33,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:27:33,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:33,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:27:33,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=648, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:27:33,988 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:34,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:34,408 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2021-11-23 02:27:34,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 02:27:34,408 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 02:27:34,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:34,409 INFO L225 Difference]: With dead ends: 94 [2021-11-23 02:27:34,409 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 02:27:34,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 255 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 710 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=835, Invalid=1921, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:27:34,410 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 48 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:34,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 20 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:34,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 02:27:34,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 86. [2021-11-23 02:27:34,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 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) [2021-11-23 02:27:34,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-11-23 02:27:34,425 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2021-11-23 02:27:34,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:34,425 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-11-23 02:27:34,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 25 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:34,426 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-11-23 02:27:34,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 02:27:34,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:34,427 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1] [2021-11-23 02:27:34,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-23 02:27:34,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-23 02:27:34,641 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:34,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:34,641 INFO L85 PathProgramCache]: Analyzing trace with hash -1667963820, now seen corresponding path program 39 times [2021-11-23 02:27:34,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:34,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793842443] [2021-11-23 02:27:34,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:34,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:35,353 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:35,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:35,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793842443] [2021-11-23 02:27:35,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793842443] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:35,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813724321] [2021-11-23 02:27:35,354 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:35,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:35,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:35,355 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:35,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 02:27:35,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:35,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:35,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 02:27:35,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:36,721 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:36,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:36,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813724321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:36,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520991767] [2021-11-23 02:27:36,917 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:36,917 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:36,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:36,918 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:36,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:37,012 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:37,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20565#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:37,352 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:37,353 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:37,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 66 [2021-11-23 02:27:37,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037463464] [2021-11-23 02:27:37,353 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:37,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 02:27:37,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:37,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 02:27:37,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1031, Invalid=4081, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:27:37,356 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 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) [2021-11-23 02:27:38,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:38,034 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2021-11-23 02:27:38,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 02:27:38,035 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 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 85 [2021-11-23 02:27:38,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:38,035 INFO L225 Difference]: With dead ends: 153 [2021-11-23 02:27:38,035 INFO L226 Difference]: Without dead ends: 87 [2021-11-23 02:27:38,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2049 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1747, Invalid=6809, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 02:27:38,037 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:38,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 223 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:38,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-23 02:27:38,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-11-23 02:27:38,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:38,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-11-23 02:27:38,055 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 85 [2021-11-23 02:27:38,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:38,056 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-11-23 02:27:38,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.283582089552239) internal successors, (153), 66 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) [2021-11-23 02:27:38,056 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-11-23 02:27:38,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 02:27:38,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:38,057 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2021-11-23 02:27:38,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:38,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-23 02:27:38,265 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:38,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:38,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1587120463, now seen corresponding path program 40 times [2021-11-23 02:27:38,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:38,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747273327] [2021-11-23 02:27:38,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:38,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:38,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:38,598 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 210 proven. 631 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:38,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:38,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747273327] [2021-11-23 02:27:38,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747273327] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:38,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67596135] [2021-11-23 02:27:38,599 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:38,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:38,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:38,615 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:38,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 02:27:38,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:38,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 02:27:38,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:38,900 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:38,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:39,142 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 231 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:39,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67596135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:39,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705286103] [2021-11-23 02:27:39,143 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:39,144 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:39,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:39,144 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:39,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:39,220 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:39,472 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21558#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:39,472 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:39,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:39,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 26 [2021-11-23 02:27:39,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680589712] [2021-11-23 02:27:39,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:39,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:27:39,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:39,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:27:39,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=687, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:27:39,475 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:39,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:39,904 INFO L93 Difference]: Finished difference Result 98 states and 99 transitions. [2021-11-23 02:27:39,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-23 02:27:39,905 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 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 86 [2021-11-23 02:27:39,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:39,905 INFO L225 Difference]: With dead ends: 98 [2021-11-23 02:27:39,906 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 02:27:39,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 268 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=906, Invalid=2064, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:27:39,906 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 72 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:39,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 19 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:39,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 02:27:39,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-23 02:27:39,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:39,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-11-23 02:27:39,919 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2021-11-23 02:27:39,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:39,919 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-11-23 02:27:39,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:39,920 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-11-23 02:27:39,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 02:27:39,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:39,921 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1] [2021-11-23 02:27:39,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:40,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-23 02:27:40,125 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:40,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:40,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1384428150, now seen corresponding path program 41 times [2021-11-23 02:27:40,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:40,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892808401] [2021-11-23 02:27:40,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:40,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:40,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:40,960 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:40,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:40,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892808401] [2021-11-23 02:27:40,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892808401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:40,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539125817] [2021-11-23 02:27:40,961 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:40,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:40,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:40,962 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:40,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 02:27:41,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-23 02:27:41,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:41,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:27:41,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:42,175 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:42,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:42,398 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:42,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539125817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:42,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024087538] [2021-11-23 02:27:42,400 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:42,400 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:42,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:42,400 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:42,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:42,516 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:42,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22528#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:42,856 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:42,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:42,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 69 [2021-11-23 02:27:42,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639974122] [2021-11-23 02:27:42,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:42,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-23 02:27:42,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:42,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-23 02:27:42,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1123, Invalid=4427, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 02:27:42,859 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:43,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:43,535 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2021-11-23 02:27:43,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 02:27:43,536 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 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 89 [2021-11-23 02:27:43,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:43,537 INFO L225 Difference]: With dead ends: 160 [2021-11-23 02:27:43,537 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 02:27:43,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2224 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1906, Invalid=7406, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 02:27:43,539 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 5 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:43,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 199 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:43,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 02:27:43,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 02:27:43,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:43,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-11-23 02:27:43,556 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2021-11-23 02:27:43,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:43,557 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-11-23 02:27:43,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.2857142857142856) internal successors, (160), 69 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:43,557 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-11-23 02:27:43,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 02:27:43,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:43,558 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2021-11-23 02:27:43,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:43,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-23 02:27:43,781 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:43,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:43,781 INFO L85 PathProgramCache]: Analyzing trace with hash -497091323, now seen corresponding path program 42 times [2021-11-23 02:27:43,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:43,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276489574] [2021-11-23 02:27:43,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:43,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:43,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:44,211 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 231 proven. 694 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:44,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:44,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276489574] [2021-11-23 02:27:44,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276489574] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:44,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659610967] [2021-11-23 02:27:44,211 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:44,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:44,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:44,217 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:44,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 02:27:44,317 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:44,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:44,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 02:27:44,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:44,533 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:44,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:44,767 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 253 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:44,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659610967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:44,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744402801] [2021-11-23 02:27:44,770 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:44,770 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:44,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:44,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:44,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:44,859 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:45,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23567#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:45,095 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:45,095 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:45,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 27 [2021-11-23 02:27:45,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414106076] [2021-11-23 02:27:45,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:45,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:27:45,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:45,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:27:45,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=727, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:27:45,097 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:45,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:45,545 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2021-11-23 02:27:45,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-23 02:27:45,546 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-23 02:27:45,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:45,546 INFO L225 Difference]: With dead ends: 102 [2021-11-23 02:27:45,547 INFO L226 Difference]: Without dead ends: 100 [2021-11-23 02:27:45,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=980, Invalid=2212, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:27:45,547 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 97 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:45,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 23 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:45,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-23 02:27:45,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2021-11-23 02:27:45,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 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) [2021-11-23 02:27:45,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-11-23 02:27:45,561 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-11-23 02:27:45,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:45,562 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-11-23 02:27:45,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.357142857142857) internal successors, (94), 27 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:45,562 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-11-23 02:27:45,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:27:45,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:45,563 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1] [2021-11-23 02:27:45,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-23 02:27:45,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-23 02:27:45,781 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:45,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:45,781 INFO L85 PathProgramCache]: Analyzing trace with hash 204453396, now seen corresponding path program 43 times [2021-11-23 02:27:45,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:45,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121852108] [2021-11-23 02:27:45,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:45,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:45,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:46,593 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 673 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:46,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:46,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121852108] [2021-11-23 02:27:46,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121852108] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:46,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161239089] [2021-11-23 02:27:46,593 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:46,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:46,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:46,594 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:46,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 02:27:46,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:46,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:27:46,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:47,868 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:47,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:48,083 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 737 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:48,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161239089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:48,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473524552] [2021-11-23 02:27:48,084 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:48,085 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:48,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:48,085 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:48,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:48,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:48,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24580#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:48,550 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:48,550 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:48,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 72 [2021-11-23 02:27:48,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466111629] [2021-11-23 02:27:48,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:48,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-23 02:27:48,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:48,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-23 02:27:48,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=4787, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 02:27:48,553 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 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) [2021-11-23 02:27:49,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:49,323 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2021-11-23 02:27:49,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-23 02:27:49,323 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 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) Word has length 93 [2021-11-23 02:27:49,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:49,324 INFO L225 Difference]: With dead ends: 167 [2021-11-23 02:27:49,324 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 02:27:49,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2406 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2072, Invalid=8028, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:27:49,326 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 5 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:49,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 220 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:49,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 02:27:49,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-23 02:27:49,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:49,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-11-23 02:27:49,340 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 93 [2021-11-23 02:27:49,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:49,341 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-11-23 02:27:49,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.287671232876712) internal successors, (167), 72 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) [2021-11-23 02:27:49,341 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-11-23 02:27:49,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:27:49,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:49,343 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1] [2021-11-23 02:27:49,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:49,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-23 02:27:49,569 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:49,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:49,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1066848241, now seen corresponding path program 44 times [2021-11-23 02:27:49,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:49,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381820207] [2021-11-23 02:27:49,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:49,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:49,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:50,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 253 proven. 760 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:50,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:50,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381820207] [2021-11-23 02:27:50,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381820207] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:50,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807597904] [2021-11-23 02:27:50,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:50,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:50,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:50,036 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:50,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 02:27:50,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-23 02:27:50,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:50,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-23 02:27:50,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:50,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:50,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 276 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:50,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807597904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:50,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [379987782] [2021-11-23 02:27:50,617 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:50,617 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:50,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:50,618 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:50,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:50,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:50,994 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25665#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:50,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:50,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:50,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 28 [2021-11-23 02:27:50,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868557651] [2021-11-23 02:27:50,995 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:50,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:27:50,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:50,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:27:50,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=768, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:27:50,997 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:51,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:51,612 INFO L93 Difference]: Finished difference Result 106 states and 107 transitions. [2021-11-23 02:27:51,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-23 02:27:51,612 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-23 02:27:51,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:51,613 INFO L225 Difference]: With dead ends: 106 [2021-11-23 02:27:51,613 INFO L226 Difference]: Without dead ends: 104 [2021-11-23 02:27:51,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 294 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1057, Invalid=2365, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 02:27:51,615 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 103 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:51,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 15 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:51,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-23 02:27:51,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 98. [2021-11-23 02:27:51,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 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) [2021-11-23 02:27:51,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-11-23 02:27:51,626 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2021-11-23 02:27:51,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:51,627 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-11-23 02:27:51,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:51,627 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-11-23 02:27:51,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 02:27:51,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:51,629 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1] [2021-11-23 02:27:51,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-23 02:27:51,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:51,837 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:51,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:51,837 INFO L85 PathProgramCache]: Analyzing trace with hash 286863050, now seen corresponding path program 45 times [2021-11-23 02:27:51,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:51,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843154593] [2021-11-23 02:27:51,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:51,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:51,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:52,756 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:52,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:52,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843154593] [2021-11-23 02:27:52,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843154593] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:52,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185729661] [2021-11-23 02:27:52,757 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:27:52,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:52,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:52,758 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:52,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 02:27:52,836 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:27:52,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:52,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-23 02:27:52,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:54,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:54,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:54,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185729661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:54,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350061457] [2021-11-23 02:27:54,441 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:54,441 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:54,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:54,442 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:54,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:54,559 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:54,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26721#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:54,904 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:54,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:54,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 75 [2021-11-23 02:27:54,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141791221] [2021-11-23 02:27:54,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:54,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-23 02:27:54,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:54,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-23 02:27:54,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1319, Invalid=5161, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 02:27:54,907 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:55,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:55,729 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2021-11-23 02:27:55,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 02:27:55,729 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 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 97 [2021-11-23 02:27:55,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:55,730 INFO L225 Difference]: With dead ends: 174 [2021-11-23 02:27:55,730 INFO L226 Difference]: Without dead ends: 99 [2021-11-23 02:27:55,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2595 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2245, Invalid=8675, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 02:27:55,732 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 5 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:55,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 256 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:55,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-23 02:27:55,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-23 02:27:55,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:55,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-11-23 02:27:55,744 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 97 [2021-11-23 02:27:55,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:55,744 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-11-23 02:27:55,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.289473684210526) internal successors, (174), 75 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:55,745 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-11-23 02:27:55,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 02:27:55,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:55,746 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1] [2021-11-23 02:27:55,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:55,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-23 02:27:55,961 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:55,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:55,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1212206267, now seen corresponding path program 46 times [2021-11-23 02:27:55,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:55,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609260533] [2021-11-23 02:27:55,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:55,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:55,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:56,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 276 proven. 829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:56,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:56,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609260533] [2021-11-23 02:27:56,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609260533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:56,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256809298] [2021-11-23 02:27:56,426 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:27:56,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:56,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:56,428 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:56,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-23 02:27:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:56,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-23 02:27:56,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:56,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:56,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 300 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:56,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256809298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:56,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2126927273] [2021-11-23 02:27:56,942 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:27:56,942 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:56,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:56,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:56,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:27:57,033 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:57,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27852#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:57,268 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:57,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:57,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 29 [2021-11-23 02:27:57,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954671269] [2021-11-23 02:27:57,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:57,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 02:27:57,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:57,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 02:27:57,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=810, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:27:57,270 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:57,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:57,776 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2021-11-23 02:27:57,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 02:27:57,777 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 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 98 [2021-11-23 02:27:57,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:57,778 INFO L225 Difference]: With dead ends: 110 [2021-11-23 02:27:57,778 INFO L226 Difference]: Without dead ends: 108 [2021-11-23 02:27:57,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 307 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1137, Invalid=2523, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:27:57,779 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 80 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:57,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 15 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:57,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-23 02:27:57,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 102. [2021-11-23 02:27:57,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:57,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-11-23 02:27:57,797 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2021-11-23 02:27:57,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:57,797 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-11-23 02:27:57,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.4) internal successors, (102), 29 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:27:57,798 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-11-23 02:27:57,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 02:27:57,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:57,799 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1] [2021-11-23 02:27:57,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:58,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-23 02:27:58,013 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:58,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:58,013 INFO L85 PathProgramCache]: Analyzing trace with hash -747055148, now seen corresponding path program 47 times [2021-11-23 02:27:58,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:58,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215829470] [2021-11-23 02:27:58,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:58,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:58,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:58,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 806 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:58,976 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:58,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215829470] [2021-11-23 02:27:58,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215829470] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:58,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158407487] [2021-11-23 02:27:58,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:27:58,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:58,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:58,978 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:58,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 02:27:59,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-23 02:27:59,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:27:59,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-23 02:27:59,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:00,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:00,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:00,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 876 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:00,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158407487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:00,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [387076755] [2021-11-23 02:28:00,871 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:00,872 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:00,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:00,872 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:00,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:00,999 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:01,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28951#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:01,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:01,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:01,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 78 [2021-11-23 02:28:01,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359494727] [2021-11-23 02:28:01,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:01,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 02:28:01,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:01,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 02:28:01,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1423, Invalid=5549, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 02:28:01,370 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 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) [2021-11-23 02:28:02,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:02,314 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2021-11-23 02:28:02,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-23 02:28:02,314 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 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) Word has length 101 [2021-11-23 02:28:02,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:02,315 INFO L225 Difference]: With dead ends: 181 [2021-11-23 02:28:02,315 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 02:28:02,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2791 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2425, Invalid=9347, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 02:28:02,317 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 5 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:02,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 236 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:02,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 02:28:02,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 02:28:02,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0196078431372548) internal successors, (104), 102 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:02,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-11-23 02:28:02,337 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2021-11-23 02:28:02,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:02,337 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-11-23 02:28:02,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.2911392405063293) internal successors, (181), 78 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) [2021-11-23 02:28:02,338 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-11-23 02:28:02,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:28:02,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:02,339 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1] [2021-11-23 02:28:02,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:02,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-23 02:28:02,561 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:02,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:02,561 INFO L85 PathProgramCache]: Analyzing trace with hash -163436849, now seen corresponding path program 48 times [2021-11-23 02:28:02,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:02,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156396251] [2021-11-23 02:28:02,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:02,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:02,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:03,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 300 proven. 901 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:03,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:03,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156396251] [2021-11-23 02:28:03,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156396251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:03,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830963421] [2021-11-23 02:28:03,117 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:03,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:03,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:03,119 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:03,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 02:28:03,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:03,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:03,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-23 02:28:03,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:03,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:03,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 325 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:03,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830963421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:03,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392058739] [2021-11-23 02:28:03,753 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:03,754 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:03,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:03,754 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:03,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:03,847 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:04,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30128#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:04,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:04,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:04,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 30 [2021-11-23 02:28:04,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167125881] [2021-11-23 02:28:04,097 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:04,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:28:04,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:04,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:28:04,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=853, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:28:04,099 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:04,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:04,669 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2021-11-23 02:28:04,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-23 02:28:04,670 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-23 02:28:04,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:04,671 INFO L225 Difference]: With dead ends: 114 [2021-11-23 02:28:04,671 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 02:28:04,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 320 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1220, Invalid=2686, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 02:28:04,672 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 60 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:04,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 12 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:04,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 02:28:04,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2021-11-23 02:28:04,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 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) [2021-11-23 02:28:04,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-11-23 02:28:04,694 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 102 [2021-11-23 02:28:04,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:04,694 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-11-23 02:28:04,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.4193548387096775) internal successors, (106), 30 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:04,695 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-11-23 02:28:04,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-23 02:28:04,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:04,696 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1] [2021-11-23 02:28:04,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:04,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:04,921 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:04,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:04,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1550565386, now seen corresponding path program 49 times [2021-11-23 02:28:04,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:04,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945218833] [2021-11-23 02:28:04,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:04,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:04,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:06,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:06,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:06,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945218833] [2021-11-23 02:28:06,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945218833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:06,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643306029] [2021-11-23 02:28:06,026 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:06,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:06,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:06,033 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:06,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-23 02:28:06,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:06,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-23 02:28:06,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:07,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:07,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:08,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:08,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643306029] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:08,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029058201] [2021-11-23 02:28:08,004 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:08,004 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:08,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:08,005 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:08,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:08,104 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:08,536 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31270#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:08,536 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:08,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:08,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 81 [2021-11-23 02:28:08,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859603745] [2021-11-23 02:28:08,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:08,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 02:28:08,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:08,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 02:28:08,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1531, Invalid=5951, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 02:28:08,539 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:09,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:09,426 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2021-11-23 02:28:09,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 02:28:09,427 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 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 105 [2021-11-23 02:28:09,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:09,428 INFO L225 Difference]: With dead ends: 188 [2021-11-23 02:28:09,428 INFO L226 Difference]: Without dead ends: 107 [2021-11-23 02:28:09,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2994 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2612, Invalid=10044, Unknown=0, NotChecked=0, Total=12656 [2021-11-23 02:28:09,431 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 5 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:09,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 243 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:09,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-23 02:28:09,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-23 02:28:09,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:09,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-23 02:28:09,450 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 105 [2021-11-23 02:28:09,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:09,451 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-23 02:28:09,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.292682926829268) internal successors, (188), 81 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:09,451 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-23 02:28:09,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 02:28:09,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:09,452 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1] [2021-11-23 02:28:09,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-23 02:28:09,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:09,657 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:09,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:09,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1269766533, now seen corresponding path program 50 times [2021-11-23 02:28:09,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:09,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823712297] [2021-11-23 02:28:09,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:09,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:09,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:10,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 325 proven. 976 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:10,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:10,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823712297] [2021-11-23 02:28:10,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823712297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:10,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929593311] [2021-11-23 02:28:10,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:10,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:10,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:10,202 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:10,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 02:28:10,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-23 02:28:10,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:10,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-23 02:28:10,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:10,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:10,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:11,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 351 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:11,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929593311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:11,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139952570] [2021-11-23 02:28:11,025 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:11,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:11,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:11,026 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:11,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:11,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:11,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32493#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:11,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:11,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:11,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 31 [2021-11-23 02:28:11,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132559293] [2021-11-23 02:28:11,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:11,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:28:11,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:11,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:28:11,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=897, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:28:11,366 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:11,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:11,930 INFO L93 Difference]: Finished difference Result 118 states and 119 transitions. [2021-11-23 02:28:11,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-23 02:28:11,931 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-23 02:28:11,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:11,932 INFO L225 Difference]: With dead ends: 118 [2021-11-23 02:28:11,933 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 02:28:11,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 333 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1076 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1306, Invalid=2854, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:28:11,934 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 86 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:11,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 21 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:11,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 02:28:11,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 110. [2021-11-23 02:28:11,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 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) [2021-11-23 02:28:11,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-11-23 02:28:11,958 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 106 [2021-11-23 02:28:11,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:11,958 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-11-23 02:28:11,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 31 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:11,959 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-11-23 02:28:11,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 02:28:11,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:11,960 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1] [2021-11-23 02:28:12,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:12,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-23 02:28:12,185 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:12,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:12,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1842629012, now seen corresponding path program 51 times [2021-11-23 02:28:12,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:12,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527445922] [2021-11-23 02:28:12,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:12,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:12,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:13,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 951 proven. 427 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:13,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:13,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527445922] [2021-11-23 02:28:13,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527445922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:13,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328303896] [2021-11-23 02:28:13,262 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:13,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:13,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:13,263 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:13,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 02:28:13,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:13,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:13,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 02:28:13,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:15,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:15,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 1027 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:15,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328303896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:15,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154399681] [2021-11-23 02:28:15,388 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:15,388 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:15,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:15,388 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:15,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:15,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:15,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33678#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:15,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:15,932 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:15,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 84 [2021-11-23 02:28:15,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76948179] [2021-11-23 02:28:15,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:15,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-23 02:28:15,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:15,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-23 02:28:15,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1643, Invalid=6367, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 02:28:15,934 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) [2021-11-23 02:28:16,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:16,982 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2021-11-23 02:28:16,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-23 02:28:16,982 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) Word has length 109 [2021-11-23 02:28:16,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:16,983 INFO L225 Difference]: With dead ends: 195 [2021-11-23 02:28:16,983 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 02:28:16,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3204 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2806, Invalid=10766, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 02:28:16,985 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 5 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:16,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 373 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:16,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 02:28:17,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-23 02:28:17,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:17,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2021-11-23 02:28:17,006 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 109 [2021-11-23 02:28:17,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:17,006 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2021-11-23 02:28:17,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 2.2941176470588234) internal successors, (195), 84 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) [2021-11-23 02:28:17,006 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2021-11-23 02:28:17,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 02:28:17,007 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:17,007 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1] [2021-11-23 02:28:17,037 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 02:28:17,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-23 02:28:17,217 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:17,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:17,217 INFO L85 PathProgramCache]: Analyzing trace with hash -259494513, now seen corresponding path program 52 times [2021-11-23 02:28:17,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:17,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135603362] [2021-11-23 02:28:17,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:17,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:17,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:17,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 351 proven. 1054 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:17,814 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:17,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135603362] [2021-11-23 02:28:17,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135603362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:17,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566952392] [2021-11-23 02:28:17,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:17,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:17,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:17,817 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:17,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-23 02:28:17,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:17,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-23 02:28:17,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:18,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:18,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:18,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 378 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:18,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566952392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:18,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [779079571] [2021-11-23 02:28:18,542 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:18,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:18,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:18,543 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:18,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:18,623 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:18,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34947#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:18,870 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:18,870 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:18,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 32 [2021-11-23 02:28:18,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613580663] [2021-11-23 02:28:18,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:18,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 02:28:18,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:18,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 02:28:18,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=942, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:28:18,872 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:19,468 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-11-23 02:28:19,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-23 02:28:19,469 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 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 110 [2021-11-23 02:28:19,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:19,470 INFO L225 Difference]: With dead ends: 122 [2021-11-23 02:28:19,470 INFO L226 Difference]: Without dead ends: 120 [2021-11-23 02:28:19,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 346 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1395, Invalid=3027, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 02:28:19,471 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 118 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:19,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 13 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:19,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-23 02:28:19,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 114. [2021-11-23 02:28:19,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-11-23 02:28:19,495 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 110 [2021-11-23 02:28:19,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:19,495 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-11-23 02:28:19,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.4545454545454546) internal successors, (114), 32 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,496 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-11-23 02:28:19,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:28:19,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:19,497 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1] [2021-11-23 02:28:19,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:19,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-23 02:28:19,725 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:19,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:19,725 INFO L85 PathProgramCache]: Analyzing trace with hash 344916298, now seen corresponding path program 53 times [2021-11-23 02:28:19,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:19,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459607737] [2021-11-23 02:28:19,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:19,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:20,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1028 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:20,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:20,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459607737] [2021-11-23 02:28:20,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459607737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:20,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80971353] [2021-11-23 02:28:20,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:20,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:20,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:20,999 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:21,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 02:28:21,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-23 02:28:21,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:21,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-23 02:28:21,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:22,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:22,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:23,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:23,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80971353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:23,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503291650] [2021-11-23 02:28:23,224 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:23,224 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:23,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:23,224 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:23,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:23,307 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:23,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36175#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:23,748 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:23,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:23,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 87 [2021-11-23 02:28:23,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166796563] [2021-11-23 02:28:23,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:23,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 02:28:23,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:23,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 02:28:23,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1759, Invalid=6797, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 02:28:23,752 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:24,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:24,792 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2021-11-23 02:28:24,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-23 02:28:24,793 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 states have internal predecessors, (202), 0 states have call successors, (0), 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 113 [2021-11-23 02:28:24,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:24,794 INFO L225 Difference]: With dead ends: 202 [2021-11-23 02:28:24,794 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 02:28:24,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3421 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3007, Invalid=11513, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 02:28:24,795 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 5 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:24,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 254 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:24,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 02:28:24,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-23 02:28:24,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0175438596491229) internal successors, (116), 114 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) [2021-11-23 02:28:24,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2021-11-23 02:28:24,821 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2021-11-23 02:28:24,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:24,822 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2021-11-23 02:28:24,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.2954545454545454) internal successors, (202), 87 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:24,822 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2021-11-23 02:28:24,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:28:24,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:24,824 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1] [2021-11-23 02:28:24,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:25,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-23 02:28:25,049 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:25,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:25,049 INFO L85 PathProgramCache]: Analyzing trace with hash 407547845, now seen corresponding path program 54 times [2021-11-23 02:28:25,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:25,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179875943] [2021-11-23 02:28:25,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:25,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:25,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:25,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 378 proven. 1135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:25,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:25,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179875943] [2021-11-23 02:28:25,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179875943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:25,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994541427] [2021-11-23 02:28:25,704 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:25,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:25,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:25,706 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:25,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 02:28:25,832 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:25,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:25,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:28:25,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:26,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:26,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:26,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 406 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:26,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994541427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:26,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184822907] [2021-11-23 02:28:26,447 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:26,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:26,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:26,447 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:26,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:26,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:26,784 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37490#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:26,784 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:26,785 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:26,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 33 [2021-11-23 02:28:26,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120526075] [2021-11-23 02:28:26,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:26,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 02:28:26,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:26,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 02:28:26,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=988, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:28:26,787 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:27,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:27,443 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2021-11-23 02:28:27,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 02:28:27,443 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 02:28:27,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:27,444 INFO L225 Difference]: With dead ends: 126 [2021-11-23 02:28:27,444 INFO L226 Difference]: Without dead ends: 124 [2021-11-23 02:28:27,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 359 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1214 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1487, Invalid=3205, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 02:28:27,445 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 92 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:27,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 18 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:27,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-23 02:28:27,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 118. [2021-11-23 02:28:27,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.017094017094017) internal successors, (119), 117 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) [2021-11-23 02:28:27,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2021-11-23 02:28:27,464 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2021-11-23 02:28:27,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:27,464 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2021-11-23 02:28:27,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.4705882352941178) internal successors, (118), 33 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:27,464 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2021-11-23 02:28:27,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 02:28:27,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:27,465 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1] [2021-11-23 02:28:27,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 02:28:27,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-23 02:28:27,666 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:27,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:27,666 INFO L85 PathProgramCache]: Analyzing trace with hash -609875116, now seen corresponding path program 55 times [2021-11-23 02:28:27,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:27,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238987061] [2021-11-23 02:28:27,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:27,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:27,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:28,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:28,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:28,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238987061] [2021-11-23 02:28:28,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238987061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:28,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275616211] [2021-11-23 02:28:28,991 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:28,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:28,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:28,992 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:28,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-23 02:28:29,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:29,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 02:28:29,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:31,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:31,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:31,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:31,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275616211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:31,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271693084] [2021-11-23 02:28:31,409 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:31,409 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:31,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:31,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:31,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:31,499 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:31,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38761#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:31,942 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:31,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:31,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 90 [2021-11-23 02:28:31,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599855205] [2021-11-23 02:28:31,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:31,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-23 02:28:31,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:31,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-23 02:28:31,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1879, Invalid=7241, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 02:28:31,944 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:32,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:32,992 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2021-11-23 02:28:32,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-23 02:28:32,993 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 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 117 [2021-11-23 02:28:32,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:32,994 INFO L225 Difference]: With dead ends: 209 [2021-11-23 02:28:32,995 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 02:28:32,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3645 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3215, Invalid=12285, Unknown=0, NotChecked=0, Total=15500 [2021-11-23 02:28:32,997 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 5 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:32,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 259 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:32,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 02:28:33,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-23 02:28:33,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:33,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2021-11-23 02:28:33,023 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 117 [2021-11-23 02:28:33,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:33,023 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2021-11-23 02:28:33,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.2967032967032965) internal successors, (209), 90 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:33,024 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2021-11-23 02:28:33,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 02:28:33,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:33,025 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1] [2021-11-23 02:28:33,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:33,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:33,245 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:33,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:33,245 INFO L85 PathProgramCache]: Analyzing trace with hash 614466639, now seen corresponding path program 56 times [2021-11-23 02:28:33,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:33,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194253974] [2021-11-23 02:28:33,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:33,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:33,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:33,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 406 proven. 1219 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:33,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:33,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194253974] [2021-11-23 02:28:33,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194253974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:33,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737932360] [2021-11-23 02:28:33,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:33,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:33,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:33,821 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:33,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 02:28:33,965 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-11-23 02:28:33,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:33,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-23 02:28:33,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:34,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:34,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:34,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 435 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:34,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737932360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:34,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020355492] [2021-11-23 02:28:34,561 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:34,562 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:34,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:34,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:34,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:34,652 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:34,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40122#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:34,881 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:34,881 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:34,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 34 [2021-11-23 02:28:34,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847809595] [2021-11-23 02:28:34,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:34,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 02:28:34,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:34,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 02:28:34,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=1035, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:28:34,882 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:35,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:35,532 INFO L93 Difference]: Finished difference Result 130 states and 131 transitions. [2021-11-23 02:28:35,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-23 02:28:35,532 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-23 02:28:35,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:35,533 INFO L225 Difference]: With dead ends: 130 [2021-11-23 02:28:35,533 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:28:35,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 372 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1286 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1582, Invalid=3388, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 02:28:35,534 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 95 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:35,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 19 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:35,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:28:35,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2021-11-23 02:28:35,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 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) [2021-11-23 02:28:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-11-23 02:28:35,559 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 118 [2021-11-23 02:28:35,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:35,559 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-11-23 02:28:35,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4857142857142858) internal successors, (122), 34 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:35,560 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-11-23 02:28:35,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 02:28:35,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:35,561 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1] [2021-11-23 02:28:35,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:35,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-23 02:28:35,771 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:35,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:35,772 INFO L85 PathProgramCache]: Analyzing trace with hash 429847178, now seen corresponding path program 57 times [2021-11-23 02:28:35,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:35,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760402287] [2021-11-23 02:28:35,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:35,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:35,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:37,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1191 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:37,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:37,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760402287] [2021-11-23 02:28:37,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760402287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:37,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158967091] [2021-11-23 02:28:37,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:37,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:37,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:37,169 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:37,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 02:28:37,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:37,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:37,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-23 02:28:37,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:39,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:39,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:39,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:39,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158967091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:39,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [289715387] [2021-11-23 02:28:39,524 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:39,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:39,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:39,525 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:39,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:39,619 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:40,027 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41436#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:40,027 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:40,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:40,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 93 [2021-11-23 02:28:40,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329359808] [2021-11-23 02:28:40,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:40,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-23 02:28:40,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:40,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-23 02:28:40,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2003, Invalid=7699, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 02:28:40,030 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 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) [2021-11-23 02:28:41,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:41,200 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2021-11-23 02:28:41,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-23 02:28:41,201 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 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 121 [2021-11-23 02:28:41,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:41,202 INFO L225 Difference]: With dead ends: 216 [2021-11-23 02:28:41,202 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 02:28:41,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3876 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3430, Invalid=13082, Unknown=0, NotChecked=0, Total=16512 [2021-11-23 02:28:41,203 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 5 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 670 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:41,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 338 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 670 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:41,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 02:28:41,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-11-23 02:28:41,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:41,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2021-11-23 02:28:41,222 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 121 [2021-11-23 02:28:41,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:41,223 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2021-11-23 02:28:41,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.297872340425532) internal successors, (216), 93 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) [2021-11-23 02:28:41,223 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2021-11-23 02:28:41,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:28:41,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:41,224 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1] [2021-11-23 02:28:41,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:41,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-23 02:28:41,449 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:41,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:41,449 INFO L85 PathProgramCache]: Analyzing trace with hash -223480315, now seen corresponding path program 58 times [2021-11-23 02:28:41,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:41,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571149402] [2021-11-23 02:28:41,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:41,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:41,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:42,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 435 proven. 1306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:42,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:42,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571149402] [2021-11-23 02:28:42,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571149402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:42,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783262747] [2021-11-23 02:28:42,027 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:42,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:42,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:42,028 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:42,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 02:28:42,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:42,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-23 02:28:42,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:42,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:42,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 465 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:42,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783262747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:42,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305316332] [2021-11-23 02:28:42,676 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:42,677 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:42,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:42,677 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:42,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:42,755 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:42,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42843#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:42,993 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:42,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:42,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 35 [2021-11-23 02:28:42,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564413605] [2021-11-23 02:28:42,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:42,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 02:28:42,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:42,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 02:28:42,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1083, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 02:28:42,994 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:43,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:43,666 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2021-11-23 02:28:43,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 02:28:43,667 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2021-11-23 02:28:43,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:43,667 INFO L225 Difference]: With dead ends: 134 [2021-11-23 02:28:43,668 INFO L226 Difference]: Without dead ends: 132 [2021-11-23 02:28:43,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 385 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1680, Invalid=3576, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:28:43,669 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 100 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:43,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 17 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:43,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-23 02:28:43,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 126. [2021-11-23 02:28:43,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:43,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-11-23 02:28:43,692 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 122 [2021-11-23 02:28:43,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:43,693 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-11-23 02:28:43,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:43,693 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-11-23 02:28:43,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 02:28:43,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:43,695 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1] [2021-11-23 02:28:43,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:43,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-23 02:28:43,897 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:43,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:43,897 INFO L85 PathProgramCache]: Analyzing trace with hash -497935084, now seen corresponding path program 59 times [2021-11-23 02:28:43,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:43,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203935591] [2021-11-23 02:28:43,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:43,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:43,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:45,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1277 proven. 553 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:45,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:45,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203935591] [2021-11-23 02:28:45,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203935591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:45,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127578213] [2021-11-23 02:28:45,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:45,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:45,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:45,315 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:45,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-23 02:28:45,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2021-11-23 02:28:45,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:45,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-23 02:28:45,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:47,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:47,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:47,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:47,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127578213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:47,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2126575064] [2021-11-23 02:28:47,897 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:47,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:47,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:47,898 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:47,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:48,000 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:48,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44200#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:48,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:48,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:48,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 96 [2021-11-23 02:28:48,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092011361] [2021-11-23 02:28:48,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:48,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-23 02:28:48,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:48,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-23 02:28:48,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2131, Invalid=8171, Unknown=0, NotChecked=0, Total=10302 [2021-11-23 02:28:48,407 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:49,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:49,624 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2021-11-23 02:28:49,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 02:28:49,625 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 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 125 [2021-11-23 02:28:49,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:49,626 INFO L225 Difference]: With dead ends: 223 [2021-11-23 02:28:49,626 INFO L226 Difference]: Without dead ends: 127 [2021-11-23 02:28:49,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4114 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3652, Invalid=13904, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 02:28:49,628 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 5 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:49,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 329 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:49,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-23 02:28:49,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-11-23 02:28:49,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:49,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2021-11-23 02:28:49,651 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2021-11-23 02:28:49,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:49,651 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2021-11-23 02:28:49,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.2989690721649483) internal successors, (223), 96 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:49,652 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2021-11-23 02:28:49,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:28:49,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:49,653 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1] [2021-11-23 02:28:49,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-23 02:28:49,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:49,853 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:49,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:49,854 INFO L85 PathProgramCache]: Analyzing trace with hash -856888561, now seen corresponding path program 60 times [2021-11-23 02:28:49,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:49,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041162252] [2021-11-23 02:28:49,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:49,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:49,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:50,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 465 proven. 1396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:50,472 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:50,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041162252] [2021-11-23 02:28:50,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041162252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:50,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057245150] [2021-11-23 02:28:50,473 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:50,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:50,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:50,474 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:50,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 02:28:50,578 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:50,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:50,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-23 02:28:50,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:50,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:50,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:51,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 496 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:51,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057245150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:51,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229377446] [2021-11-23 02:28:51,203 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:51,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:51,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:51,204 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:51,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:51,291 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:51,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45653#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:51,544 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:51,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:51,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 36 [2021-11-23 02:28:51,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470747408] [2021-11-23 02:28:51,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:51,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:28:51,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:51,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:28:51,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=590, Invalid=1132, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:28:51,546 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:52,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:52,268 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2021-11-23 02:28:52,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-23 02:28:52,268 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2021-11-23 02:28:52,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:52,269 INFO L225 Difference]: With dead ends: 138 [2021-11-23 02:28:52,269 INFO L226 Difference]: Without dead ends: 136 [2021-11-23 02:28:52,270 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 398 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1781, Invalid=3769, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 02:28:52,270 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 102 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:52,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 14 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:28:52,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-23 02:28:52,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 130. [2021-11-23 02:28:52,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 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) [2021-11-23 02:28:52,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-11-23 02:28:52,298 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 126 [2021-11-23 02:28:52,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:52,298 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-11-23 02:28:52,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.5135135135135136) internal successors, (130), 36 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:52,299 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-11-23 02:28:52,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:28:52,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:52,300 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1] [2021-11-23 02:28:52,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:52,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:52,505 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:52,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:52,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1723306954, now seen corresponding path program 61 times [2021-11-23 02:28:52,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:52,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488523859] [2021-11-23 02:28:52,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:52,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:52,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:54,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1366 proven. 587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:54,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:54,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488523859] [2021-11-23 02:28:54,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488523859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:54,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456302577] [2021-11-23 02:28:54,008 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:54,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:54,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:54,009 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:54,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 02:28:54,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:54,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-23 02:28:54,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:56,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:56,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:56,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 1457 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:56,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456302577] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:56,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269803994] [2021-11-23 02:28:56,554 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:28:56,554 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:56,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:56,555 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:56,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:56,650 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:57,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47053#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:57,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:57,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:57,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 99 [2021-11-23 02:28:57,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673176394] [2021-11-23 02:28:57,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:57,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 02:28:57,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:57,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 02:28:57,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2263, Invalid=8657, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 02:28:57,100 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:58,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:58,394 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2021-11-23 02:28:58,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-23 02:28:58,394 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 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 129 [2021-11-23 02:28:58,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:58,395 INFO L225 Difference]: With dead ends: 230 [2021-11-23 02:28:58,395 INFO L226 Difference]: Without dead ends: 131 [2021-11-23 02:28:58,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4359 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3881, Invalid=14751, Unknown=0, NotChecked=0, Total=18632 [2021-11-23 02:28:58,397 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 5 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:58,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 375 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:58,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-23 02:28:58,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-11-23 02:28:58,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:58,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2021-11-23 02:28:58,415 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 129 [2021-11-23 02:28:58,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:58,415 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2021-11-23 02:28:58,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 2.3) internal successors, (230), 99 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:58,416 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2021-11-23 02:28:58,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:28:58,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:58,416 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1] [2021-11-23 02:28:58,442 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-23 02:28:58,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-11-23 02:28:58,621 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:58,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:58,621 INFO L85 PathProgramCache]: Analyzing trace with hash -889918395, now seen corresponding path program 62 times [2021-11-23 02:28:58,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:58,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232689511] [2021-11-23 02:28:58,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:58,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:58,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:59,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 496 proven. 1489 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:59,267 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:59,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232689511] [2021-11-23 02:28:59,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232689511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:59,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232198894] [2021-11-23 02:28:59,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:59,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:59,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:59,269 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:59,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 02:28:59,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-23 02:28:59,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:59,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-23 02:28:59,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:59,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:59,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:00,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 528 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:00,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232198894] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:00,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283868348] [2021-11-23 02:29:00,043 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:00,043 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:00,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:00,044 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:00,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:00,136 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:00,369 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48552#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:00,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:00,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:00,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 37 [2021-11-23 02:29:00,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783221539] [2021-11-23 02:29:00,370 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:00,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:29:00,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:00,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:29:00,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=624, Invalid=1182, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:29:00,372 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:01,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:01,133 INFO L93 Difference]: Finished difference Result 142 states and 143 transitions. [2021-11-23 02:29:01,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-23 02:29:01,134 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-23 02:29:01,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:01,135 INFO L225 Difference]: With dead ends: 142 [2021-11-23 02:29:01,135 INFO L226 Difference]: Without dead ends: 140 [2021-11-23 02:29:01,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 411 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1885, Invalid=3967, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 02:29:01,136 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 106 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:01,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 15 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:29:01,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-23 02:29:01,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 134. [2021-11-23 02:29:01,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 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) [2021-11-23 02:29:01,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2021-11-23 02:29:01,159 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 130 [2021-11-23 02:29:01,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:01,160 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2021-11-23 02:29:01,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.526315789473684) internal successors, (134), 37 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:01,160 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2021-11-23 02:29:01,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-23 02:29:01,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:01,161 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1] [2021-11-23 02:29:01,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-23 02:29:01,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-23 02:29:01,365 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:01,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:01,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1279033044, now seen corresponding path program 63 times [2021-11-23 02:29:01,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:01,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641634541] [2021-11-23 02:29:01,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:01,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:01,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:02,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:02,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641634541] [2021-11-23 02:29:02,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641634541] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:02,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310559142] [2021-11-23 02:29:02,950 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:29:02,950 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:02,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:02,951 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:02,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 02:29:03,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:29:03,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:03,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-23 02:29:03,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:05,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:05,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:05,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:05,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310559142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:05,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130677041] [2021-11-23 02:29:05,774 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:05,775 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:05,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:05,775 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:05,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:05,910 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:06,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49995#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:06,382 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:06,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:06,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 102 [2021-11-23 02:29:06,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728248838] [2021-11-23 02:29:06,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:06,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 02:29:06,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:06,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 02:29:06,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2399, Invalid=9157, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 02:29:06,385 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 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) [2021-11-23 02:29:07,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:07,735 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2021-11-23 02:29:07,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-23 02:29:07,735 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 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 133 [2021-11-23 02:29:07,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:07,736 INFO L225 Difference]: With dead ends: 237 [2021-11-23 02:29:07,736 INFO L226 Difference]: Without dead ends: 135 [2021-11-23 02:29:07,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4611 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4117, Invalid=15623, Unknown=0, NotChecked=0, Total=19740 [2021-11-23 02:29:07,738 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 5 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:07,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 380 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 765 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:29:07,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-23 02:29:07,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-11-23 02:29:07,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:07,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-23 02:29:07,774 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 133 [2021-11-23 02:29:07,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:07,775 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-23 02:29:07,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3009708737864076) internal successors, (237), 102 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) [2021-11-23 02:29:07,775 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-23 02:29:07,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 02:29:07,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:07,776 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1] [2021-11-23 02:29:07,803 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 02:29:07,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-23 02:29:07,979 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:07,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:07,979 INFO L85 PathProgramCache]: Analyzing trace with hash 684925391, now seen corresponding path program 64 times [2021-11-23 02:29:07,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:07,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870105207] [2021-11-23 02:29:07,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:07,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:08,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:08,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 528 proven. 1585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:08,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:08,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870105207] [2021-11-23 02:29:08,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870105207] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:08,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268497059] [2021-11-23 02:29:08,633 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:29:08,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:08,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:08,634 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:08,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-23 02:29:08,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:08,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-23 02:29:08,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:09,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:09,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:09,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 561 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:09,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268497059] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:09,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1013800904] [2021-11-23 02:29:09,369 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:09,370 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:09,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:09,370 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:09,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:09,463 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:09,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51540#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:09,743 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:09,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:09,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 38 [2021-11-23 02:29:09,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587710483] [2021-11-23 02:29:09,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:09,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 02:29:09,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:09,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 02:29:09,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=659, Invalid=1233, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:29:09,746 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 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) [2021-11-23 02:29:10,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:10,515 INFO L93 Difference]: Finished difference Result 146 states and 147 transitions. [2021-11-23 02:29:10,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-23 02:29:10,515 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 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 134 [2021-11-23 02:29:10,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:10,516 INFO L225 Difference]: With dead ends: 146 [2021-11-23 02:29:10,516 INFO L226 Difference]: Without dead ends: 144 [2021-11-23 02:29:10,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 424 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1992, Invalid=4170, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 02:29:10,517 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 144 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:10,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 15 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:29:10,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-23 02:29:10,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 138. [2021-11-23 02:29:10,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 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) [2021-11-23 02:29:10,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2021-11-23 02:29:10,540 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 134 [2021-11-23 02:29:10,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:10,540 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2021-11-23 02:29:10,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.5384615384615383) internal successors, (138), 38 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) [2021-11-23 02:29:10,540 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2021-11-23 02:29:10,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 02:29:10,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:10,541 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1] [2021-11-23 02:29:10,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:10,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-23 02:29:10,757 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:10,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:10,757 INFO L85 PathProgramCache]: Analyzing trace with hash -772479734, now seen corresponding path program 65 times [2021-11-23 02:29:10,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:10,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663235129] [2021-11-23 02:29:10,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:10,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:10,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:12,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:12,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:12,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663235129] [2021-11-23 02:29:12,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663235129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:12,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733895734] [2021-11-23 02:29:12,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:29:12,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:12,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:12,393 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:12,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 02:29:12,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-11-23 02:29:12,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:12,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-23 02:29:12,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:14,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:14,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:15,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:15,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733895734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:15,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027797868] [2021-11-23 02:29:15,284 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:15,284 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:15,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:15,285 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:15,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:15,373 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:15,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53026#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:15,850 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:15,850 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:15,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 105 [2021-11-23 02:29:15,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337226286] [2021-11-23 02:29:15,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:15,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-23 02:29:15,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:15,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-23 02:29:15,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2539, Invalid=9671, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 02:29:15,853 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:17,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:17,255 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2021-11-23 02:29:17,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-23 02:29:17,256 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 02:29:17,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:17,257 INFO L225 Difference]: With dead ends: 244 [2021-11-23 02:29:17,257 INFO L226 Difference]: Without dead ends: 139 [2021-11-23 02:29:17,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4870 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4360, Invalid=16520, Unknown=0, NotChecked=0, Total=20880 [2021-11-23 02:29:17,258 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:17,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 309 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:29:17,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-23 02:29:17,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-11-23 02:29:17,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:17,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2021-11-23 02:29:17,280 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2021-11-23 02:29:17,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:17,280 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2021-11-23 02:29:17,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.30188679245283) internal successors, (244), 105 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:17,280 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2021-11-23 02:29:17,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 02:29:17,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:17,281 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1] [2021-11-23 02:29:17,306 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-23 02:29:17,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-23 02:29:17,482 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:17,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:17,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1815843461, now seen corresponding path program 66 times [2021-11-23 02:29:17,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:17,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693271971] [2021-11-23 02:29:17,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:17,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:17,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:18,172 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 561 proven. 1684 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:18,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:18,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693271971] [2021-11-23 02:29:18,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693271971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:18,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112248917] [2021-11-23 02:29:18,173 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:29:18,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:18,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:18,174 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:18,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 02:29:18,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:29:18,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:18,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-23 02:29:18,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:18,624 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:18,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:18,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 595 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:18,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112248917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:18,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244921834] [2021-11-23 02:29:18,950 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:18,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:18,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:18,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:18,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:19,040 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:19,286 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54617#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:19,287 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:19,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:19,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 39 [2021-11-23 02:29:19,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537825856] [2021-11-23 02:29:19,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:19,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 02:29:19,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:19,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 02:29:19,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=695, Invalid=1285, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:29:19,289 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:20,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:20,111 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2021-11-23 02:29:20,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-23 02:29:20,111 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-23 02:29:20,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:20,112 INFO L225 Difference]: With dead ends: 150 [2021-11-23 02:29:20,113 INFO L226 Difference]: Without dead ends: 148 [2021-11-23 02:29:20,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 437 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1676 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2102, Invalid=4378, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 02:29:20,114 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 110 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:20,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 16 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:29:20,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-23 02:29:20,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 142. [2021-11-23 02:29:20,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 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) [2021-11-23 02:29:20,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2021-11-23 02:29:20,149 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 138 [2021-11-23 02:29:20,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:20,149 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2021-11-23 02:29:20,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.55) internal successors, (142), 39 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:20,150 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2021-11-23 02:29:20,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:29:20,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:20,151 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1] [2021-11-23 02:29:20,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:20,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:20,353 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:20,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:20,353 INFO L85 PathProgramCache]: Analyzing trace with hash 684273812, now seen corresponding path program 67 times [2021-11-23 02:29:20,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:20,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004686310] [2021-11-23 02:29:20,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:20,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:20,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:22,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:22,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:22,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004686310] [2021-11-23 02:29:22,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004686310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:22,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100284445] [2021-11-23 02:29:22,104 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:29:22,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:22,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:22,105 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:22,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-23 02:29:22,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:22,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-23 02:29:22,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:24,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:25,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:25,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100284445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:25,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [813561657] [2021-11-23 02:29:25,071 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:25,071 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:25,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:25,071 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:25,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:25,155 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:25,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56146#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:25,607 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:25,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:25,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 108 [2021-11-23 02:29:25,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534947710] [2021-11-23 02:29:25,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:25,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-23 02:29:25,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:25,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-23 02:29:25,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2683, Invalid=10199, Unknown=0, NotChecked=0, Total=12882 [2021-11-23 02:29:25,610 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 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) [2021-11-23 02:29:27,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:27,219 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2021-11-23 02:29:27,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-23 02:29:27,220 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 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) Word has length 141 [2021-11-23 02:29:27,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:27,221 INFO L225 Difference]: With dead ends: 251 [2021-11-23 02:29:27,221 INFO L226 Difference]: Without dead ends: 143 [2021-11-23 02:29:27,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 380 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5136 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4610, Invalid=17442, Unknown=0, NotChecked=0, Total=22052 [2021-11-23 02:29:27,224 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 5 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:27,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 481 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:29:27,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-23 02:29:27,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-11-23 02:29:27,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:27,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2021-11-23 02:29:27,247 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 141 [2021-11-23 02:29:27,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:27,247 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2021-11-23 02:29:27,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.302752293577982) internal successors, (251), 108 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) [2021-11-23 02:29:27,248 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2021-11-23 02:29:27,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:29:27,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:27,249 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1] [2021-11-23 02:29:27,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-23 02:29:27,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-23 02:29:27,450 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:27,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:27,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1128879985, now seen corresponding path program 68 times [2021-11-23 02:29:27,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:27,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119827274] [2021-11-23 02:29:27,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:27,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:27,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:28,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 595 proven. 1786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:28,244 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:28,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119827274] [2021-11-23 02:29:28,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119827274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:28,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416376951] [2021-11-23 02:29:28,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:29:28,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:28,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:28,246 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:28,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 02:29:28,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-23 02:29:28,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:28,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-23 02:29:28,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:28,754 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:28,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:29,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 630 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:29,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416376951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:29,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343440009] [2021-11-23 02:29:29,107 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:29,107 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:29,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:29,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:29,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:29,192 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:29,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57783#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:29,442 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:29,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:29,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 40 [2021-11-23 02:29:29,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320408320] [2021-11-23 02:29:29,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:29,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 02:29:29,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:29,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 02:29:29,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=732, Invalid=1338, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:29:29,444 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:30,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:30,283 INFO L93 Difference]: Finished difference Result 154 states and 155 transitions. [2021-11-23 02:29:30,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 02:29:30,284 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-23 02:29:30,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:30,285 INFO L225 Difference]: With dead ends: 154 [2021-11-23 02:29:30,285 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:29:30,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 450 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1760 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2215, Invalid=4591, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 02:29:30,286 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 79 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:30,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 16 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:29:30,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:29:30,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 146. [2021-11-23 02:29:30,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 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) [2021-11-23 02:29:30,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-11-23 02:29:30,315 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 142 [2021-11-23 02:29:30,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:30,316 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-11-23 02:29:30,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.5609756097560976) internal successors, (146), 40 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:30,316 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-11-23 02:29:30,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:29:30,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:30,318 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1] [2021-11-23 02:29:30,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:30,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-23 02:29:30,533 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:30,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:30,533 INFO L85 PathProgramCache]: Analyzing trace with hash -864885174, now seen corresponding path program 69 times [2021-11-23 02:29:30,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:30,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784273799] [2021-11-23 02:29:30,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:30,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:30,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:32,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1752 proven. 733 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:32,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:32,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784273799] [2021-11-23 02:29:32,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784273799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:32,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661078157] [2021-11-23 02:29:32,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:29:32,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:32,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:32,534 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:32,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 02:29:32,652 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:29:32,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:32,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-23 02:29:32,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:35,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:35,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:35,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:35,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661078157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:35,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [437424498] [2021-11-23 02:29:35,739 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:35,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:35,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:35,739 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:35,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:35,817 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:36,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59355#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:36,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:36,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:36,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 111 [2021-11-23 02:29:36,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662254868] [2021-11-23 02:29:36,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:36,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-23 02:29:36,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:36,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-23 02:29:36,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2831, Invalid=10741, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 02:29:36,292 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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) [2021-11-23 02:29:37,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:37,832 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2021-11-23 02:29:37,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-23 02:29:37,832 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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 145 [2021-11-23 02:29:37,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:37,833 INFO L225 Difference]: With dead ends: 258 [2021-11-23 02:29:37,833 INFO L226 Difference]: Without dead ends: 147 [2021-11-23 02:29:37,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5409 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=4867, Invalid=18389, Unknown=0, NotChecked=0, Total=23256 [2021-11-23 02:29:37,836 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 5 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:37,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 331 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:29:37,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-23 02:29:37,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2021-11-23 02:29:37,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:37,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2021-11-23 02:29:37,870 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 145 [2021-11-23 02:29:37,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:37,871 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2021-11-23 02:29:37,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 2.3035714285714284) internal successors, (258), 111 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) [2021-11-23 02:29:37,871 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2021-11-23 02:29:37,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:29:37,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:37,873 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1] [2021-11-23 02:29:37,916 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 02:29:38,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:38,101 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:38,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:38,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1016981701, now seen corresponding path program 70 times [2021-11-23 02:29:38,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:38,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155097821] [2021-11-23 02:29:38,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:38,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:38,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:38,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 630 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:38,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:38,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155097821] [2021-11-23 02:29:38,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155097821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:38,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189397457] [2021-11-23 02:29:38,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:29:38,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:38,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:38,896 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:38,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-23 02:29:39,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:39,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-23 02:29:39,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:39,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:39,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:39,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 666 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:39,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189397457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:39,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1384914909] [2021-11-23 02:29:39,825 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:39,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:39,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:39,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:39,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:39,913 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:40,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61038#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:40,165 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:40,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:40,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 41 [2021-11-23 02:29:40,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209581791] [2021-11-23 02:29:40,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:40,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 02:29:40,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:40,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 02:29:40,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=1392, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:29:40,167 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:41,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:41,035 INFO L93 Difference]: Finished difference Result 158 states and 159 transitions. [2021-11-23 02:29:41,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-23 02:29:41,036 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 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 146 [2021-11-23 02:29:41,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:41,038 INFO L225 Difference]: With dead ends: 158 [2021-11-23 02:29:41,038 INFO L226 Difference]: Without dead ends: 156 [2021-11-23 02:29:41,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 463 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1846 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2331, Invalid=4809, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 02:29:41,040 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 118 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:41,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 15 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:29:41,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-23 02:29:41,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 150. [2021-11-23 02:29:41,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 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) [2021-11-23 02:29:41,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-11-23 02:29:41,079 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 146 [2021-11-23 02:29:41,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:41,079 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-11-23 02:29:41,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.5714285714285716) internal successors, (150), 41 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:41,080 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-11-23 02:29:41,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:29:41,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:41,081 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1] [2021-11-23 02:29:41,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:41,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:41,296 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:41,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:41,296 INFO L85 PathProgramCache]: Analyzing trace with hash 207368788, now seen corresponding path program 71 times [2021-11-23 02:29:41,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:41,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045698456] [2021-11-23 02:29:41,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:41,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:43,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1856 proven. 772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:43,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:43,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045698456] [2021-11-23 02:29:43,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045698456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:43,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065624924] [2021-11-23 02:29:43,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:29:43,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:43,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:43,250 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:43,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 02:29:43,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-11-23 02:29:43,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:43,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-23 02:29:43,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:46,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:46,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:46,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:46,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065624924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:46,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446843805] [2021-11-23 02:29:46,585 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:46,586 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:46,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:46,586 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:46,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:46,666 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:47,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62653#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:47,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:47,135 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:47,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 114 [2021-11-23 02:29:47,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134614231] [2021-11-23 02:29:47,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:47,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-23 02:29:47,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:47,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-23 02:29:47,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2983, Invalid=11297, Unknown=0, NotChecked=0, Total=14280 [2021-11-23 02:29:47,139 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 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) [2021-11-23 02:29:48,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:48,769 INFO L93 Difference]: Finished difference Result 265 states and 267 transitions. [2021-11-23 02:29:48,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-23 02:29:48,769 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 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) Word has length 149 [2021-11-23 02:29:48,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:48,770 INFO L225 Difference]: With dead ends: 265 [2021-11-23 02:29:48,770 INFO L226 Difference]: Without dead ends: 151 [2021-11-23 02:29:48,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5689 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5131, Invalid=19361, Unknown=0, NotChecked=0, Total=24492 [2021-11-23 02:29:48,772 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 5 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:48,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 402 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:29:48,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-23 02:29:48,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-11-23 02:29:48,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.0133333333333334) internal successors, (152), 150 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:48,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2021-11-23 02:29:48,795 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2021-11-23 02:29:48,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:48,796 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2021-11-23 02:29:48,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 2.3043478260869565) internal successors, (265), 114 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) [2021-11-23 02:29:48,796 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2021-11-23 02:29:48,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-23 02:29:48,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:48,797 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1, 1, 1] [2021-11-23 02:29:48,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:48,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:48,998 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:48,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:48,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1845788849, now seen corresponding path program 72 times [2021-11-23 02:29:48,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:48,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090366635] [2021-11-23 02:29:48,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:48,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:49,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:49,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 666 proven. 1999 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:49,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:49,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090366635] [2021-11-23 02:29:49,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090366635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:49,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538482039] [2021-11-23 02:29:49,780 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:29:49,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:49,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:49,781 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:49,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 02:29:49,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:29:49,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:29:49,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-23 02:29:49,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:50,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:50,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:50,581 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 703 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:50,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538482039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:50,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [110213461] [2021-11-23 02:29:50,582 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:50,582 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:50,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:50,582 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:50,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:50,666 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:50,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64382#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:50,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:50,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:50,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 42 [2021-11-23 02:29:50,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868667988] [2021-11-23 02:29:50,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:50,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:29:50,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:50,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:29:50,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=809, Invalid=1447, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:29:50,972 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:51,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:51,895 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2021-11-23 02:29:51,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-23 02:29:51,896 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 150 [2021-11-23 02:29:51,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:51,898 INFO L225 Difference]: With dead ends: 162 [2021-11-23 02:29:51,898 INFO L226 Difference]: Without dead ends: 160 [2021-11-23 02:29:51,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 476 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1934 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2450, Invalid=5032, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 02:29:51,899 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 124 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:51,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 18 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:29:51,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-23 02:29:51,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 154. [2021-11-23 02:29:51,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.0130718954248366) internal successors, (155), 153 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) [2021-11-23 02:29:51,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2021-11-23 02:29:51,939 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2021-11-23 02:29:51,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:51,940 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2021-11-23 02:29:51,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.5813953488372094) internal successors, (154), 42 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:51,940 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2021-11-23 02:29:51,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-23 02:29:51,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:51,942 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1] [2021-11-23 02:29:51,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 02:29:52,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-11-23 02:29:52,163 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:29:52,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:29:52,163 INFO L85 PathProgramCache]: Analyzing trace with hash 575510410, now seen corresponding path program 73 times [2021-11-23 02:29:52,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:29:52,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452481092] [2021-11-23 02:29:52,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:29:52,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:29:52,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:54,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 1963 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:54,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:29:54,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452481092] [2021-11-23 02:29:54,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452481092] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:29:54,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262565271] [2021-11-23 02:29:54,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:29:54,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:29:54,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:29:54,167 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:29:54,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 02:29:54,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:29:54,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-23 02:29:54,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:29:57,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:57,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:57,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:29:57,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262565271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:29:57,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785599793] [2021-11-23 02:29:57,504 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:29:57,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:29:57,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:29:57,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:29:57,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:29:57,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:58,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66040#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:29:58,080 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:29:58,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:29:58,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 117 [2021-11-23 02:29:58,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088680262] [2021-11-23 02:29:58,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:29:58,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2021-11-23 02:29:58,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:29:58,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-11-23 02:29:58,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3139, Invalid=11867, Unknown=0, NotChecked=0, Total=15006 [2021-11-23 02:29:58,083 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:59,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:29:59,776 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2021-11-23 02:29:59,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-23 02:29:59,776 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 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 153 [2021-11-23 02:29:59,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:29:59,777 INFO L225 Difference]: With dead ends: 272 [2021-11-23 02:29:59,777 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 02:29:59,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 413 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5976 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5402, Invalid=20358, Unknown=0, NotChecked=0, Total=25760 [2021-11-23 02:29:59,779 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 5 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 858 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:29:59,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 421 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 858 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:29:59,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 02:29:59,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-11-23 02:29:59,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:59,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2021-11-23 02:29:59,804 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 153 [2021-11-23 02:29:59,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:29:59,804 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2021-11-23 02:29:59,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.305084745762712) internal successors, (272), 117 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:29:59,805 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2021-11-23 02:29:59,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-23 02:29:59,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:29:59,805 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1, 1, 1] [2021-11-23 02:29:59,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:00,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-23 02:30:00,006 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:00,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:00,006 INFO L85 PathProgramCache]: Analyzing trace with hash -46665979, now seen corresponding path program 74 times [2021-11-23 02:30:00,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:00,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909900255] [2021-11-23 02:30:00,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:00,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:00,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:00,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 703 proven. 2110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:00,822 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:00,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909900255] [2021-11-23 02:30:00,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909900255] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:00,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021698893] [2021-11-23 02:30:00,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:30:00,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:00,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:00,824 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:00,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 02:30:01,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2021-11-23 02:30:01,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:01,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-23 02:30:01,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:01,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:01,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:01,716 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 741 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:01,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021698893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:01,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [924898641] [2021-11-23 02:30:01,717 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:01,718 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:01,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:01,718 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:01,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:01,821 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:02,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67815#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:02,099 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:02,099 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:02,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 43 [2021-11-23 02:30:02,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059641905] [2021-11-23 02:30:02,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:02,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 02:30:02,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:02,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 02:30:02,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=1503, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 02:30:02,101 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:03,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:03,023 INFO L93 Difference]: Finished difference Result 166 states and 167 transitions. [2021-11-23 02:30:03,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-23 02:30:03,023 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2021-11-23 02:30:03,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:03,024 INFO L225 Difference]: With dead ends: 166 [2021-11-23 02:30:03,025 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 02:30:03,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2024 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2572, Invalid=5260, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 02:30:03,027 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 86 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:03,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 12 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:30:03,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 02:30:03,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 158. [2021-11-23 02:30:03,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 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) [2021-11-23 02:30:03,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-11-23 02:30:03,059 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 154 [2021-11-23 02:30:03,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:03,059 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-11-23 02:30:03,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.590909090909091) internal successors, (158), 43 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:03,060 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-11-23 02:30:03,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 02:30:03,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:03,069 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1] [2021-11-23 02:30:03,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:03,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2021-11-23 02:30:03,293 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:03,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:03,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1348043796, now seen corresponding path program 75 times [2021-11-23 02:30:03,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:03,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073528480] [2021-11-23 02:30:03,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:03,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:03,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:05,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2073 proven. 853 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:05,734 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:05,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073528480] [2021-11-23 02:30:05,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073528480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:05,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582085294] [2021-11-23 02:30:05,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:30:05,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:05,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:05,735 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:05,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 02:30:05,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:30:05,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:05,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-23 02:30:05,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:08,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:08,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:09,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:09,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582085294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:09,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [24456900] [2021-11-23 02:30:09,250 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:09,251 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:09,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:09,251 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:09,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:09,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:09,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69516#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:09,843 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:09,843 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:09,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 120 [2021-11-23 02:30:09,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122609835] [2021-11-23 02:30:09,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:09,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-23 02:30:09,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:09,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-23 02:30:09,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3299, Invalid=12451, Unknown=0, NotChecked=0, Total=15750 [2021-11-23 02:30:09,846 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:11,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:11,757 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2021-11-23 02:30:11,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-23 02:30:11,757 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 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 157 [2021-11-23 02:30:11,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:11,758 INFO L225 Difference]: With dead ends: 279 [2021-11-23 02:30:11,758 INFO L226 Difference]: Without dead ends: 159 [2021-11-23 02:30:11,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 587 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6270 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=5680, Invalid=21380, Unknown=0, NotChecked=0, Total=27060 [2021-11-23 02:30:11,761 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 5 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 1007 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:11,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 496 Invalid, 1007 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:30:11,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-23 02:30:11,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-11-23 02:30:11,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:11,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2021-11-23 02:30:11,800 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 157 [2021-11-23 02:30:11,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:11,800 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2021-11-23 02:30:11,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 2.3057851239669422) internal successors, (279), 120 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:11,801 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2021-11-23 02:30:11,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-23 02:30:11,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:11,802 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 1, 1, 1, 1] [2021-11-23 02:30:11,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-23 02:30:12,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-11-23 02:30:12,017 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:12,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:12,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1996858895, now seen corresponding path program 76 times [2021-11-23 02:30:12,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:12,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371975608] [2021-11-23 02:30:12,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:12,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:12,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 741 proven. 2224 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:12,887 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:12,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371975608] [2021-11-23 02:30:12,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371975608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:12,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072009826] [2021-11-23 02:30:12,888 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:30:12,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:12,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:12,889 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:12,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 02:30:12,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:12,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-23 02:30:12,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:13,343 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:13,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:13,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 780 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:13,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072009826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:13,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1730340570] [2021-11-23 02:30:13,685 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:13,685 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:13,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:13,685 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:13,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:13,762 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:14,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71337#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:14,008 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:14,008 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:14,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 44 [2021-11-23 02:30:14,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583927839] [2021-11-23 02:30:14,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:14,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 02:30:14,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:14,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 02:30:14,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=890, Invalid=1560, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:30:14,010 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:15,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:15,012 INFO L93 Difference]: Finished difference Result 170 states and 171 transitions. [2021-11-23 02:30:15,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-23 02:30:15,013 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 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 158 [2021-11-23 02:30:15,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:15,014 INFO L225 Difference]: With dead ends: 170 [2021-11-23 02:30:15,014 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:30:15,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 502 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2116 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2697, Invalid=5493, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 02:30:15,015 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 125 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:15,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 15 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:30:15,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:30:15,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 162. [2021-11-23 02:30:15,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:15,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2021-11-23 02:30:15,057 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 158 [2021-11-23 02:30:15,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:15,057 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2021-11-23 02:30:15,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.6) internal successors, (162), 44 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:15,058 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2021-11-23 02:30:15,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 02:30:15,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:15,059 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 1, 1, 1, 1] [2021-11-23 02:30:15,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:15,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-11-23 02:30:15,285 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:15,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:15,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1163855670, now seen corresponding path program 77 times [2021-11-23 02:30:15,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:15,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349185229] [2021-11-23 02:30:15,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:15,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:15,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:17,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2186 proven. 895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:17,426 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:17,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349185229] [2021-11-23 02:30:17,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349185229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:17,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354301863] [2021-11-23 02:30:17,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:30:17,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:17,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:17,427 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:17,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 02:30:17,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-11-23 02:30:17,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:17,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-23 02:30:17,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:20,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:21,066 INFO L134 CoverageAnalysis]: Checked inductivity of 3081 backedges. 2301 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:21,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354301863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:21,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906010659] [2021-11-23 02:30:21,067 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:21,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:21,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:21,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:21,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:21,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:21,682 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73081#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:21,682 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:21,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:21,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 123 [2021-11-23 02:30:21,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864927069] [2021-11-23 02:30:21,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:21,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-11-23 02:30:21,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:21,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-11-23 02:30:21,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3463, Invalid=13049, Unknown=0, NotChecked=0, Total=16512 [2021-11-23 02:30:21,685 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:23,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:23,606 INFO L93 Difference]: Finished difference Result 286 states and 288 transitions. [2021-11-23 02:30:23,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-23 02:30:23,607 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 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 161 [2021-11-23 02:30:23,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:23,608 INFO L225 Difference]: With dead ends: 286 [2021-11-23 02:30:23,608 INFO L226 Difference]: Without dead ends: 163 [2021-11-23 02:30:23,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6571 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=5965, Invalid=22427, Unknown=0, NotChecked=0, Total=28392 [2021-11-23 02:30:23,609 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 5 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 1068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:23,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 530 Invalid, 1068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1060 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:30:23,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-23 02:30:23,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2021-11-23 02:30:23,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.0123456790123457) internal successors, (164), 162 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:23,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2021-11-23 02:30:23,645 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2021-11-23 02:30:23,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:23,645 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2021-11-23 02:30:23,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 2.306451612903226) internal successors, (286), 123 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:23,646 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2021-11-23 02:30:23,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-23 02:30:23,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:23,647 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 1, 1, 1, 1] [2021-11-23 02:30:23,690 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-23 02:30:23,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:23,861 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:23,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:23,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1977244347, now seen corresponding path program 78 times [2021-11-23 02:30:23,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:23,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454028277] [2021-11-23 02:30:23,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:23,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:23,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 780 proven. 2341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:24,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:24,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454028277] [2021-11-23 02:30:24,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454028277] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:24,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91174990] [2021-11-23 02:30:24,746 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:30:24,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:24,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:24,747 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:24,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 02:30:24,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:30:24,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:24,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-23 02:30:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:25,249 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:25,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:25,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3121 backedges. 820 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:25,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91174990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:25,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392298872] [2021-11-23 02:30:25,618 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:25,618 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:25,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:25,618 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:25,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:25,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:25,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74948#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:25,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:25,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:25,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 45 [2021-11-23 02:30:25,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166770522] [2021-11-23 02:30:25,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:25,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 02:30:25,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:25,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 02:30:25,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=932, Invalid=1618, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 02:30:25,947 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:26,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:26,930 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2021-11-23 02:30:26,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-23 02:30:26,930 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 162 [2021-11-23 02:30:26,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:26,931 INFO L225 Difference]: With dead ends: 174 [2021-11-23 02:30:26,931 INFO L226 Difference]: Without dead ends: 172 [2021-11-23 02:30:26,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 515 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2825, Invalid=5731, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 02:30:26,933 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 127 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:26,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 19 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 389 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:30:26,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-23 02:30:26,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 166. [2021-11-23 02:30:26,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 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) [2021-11-23 02:30:26,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2021-11-23 02:30:26,964 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 162 [2021-11-23 02:30:26,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:26,964 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2021-11-23 02:30:26,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.608695652173913) internal successors, (166), 45 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:26,965 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2021-11-23 02:30:26,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-23 02:30:26,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:26,967 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 1, 1, 1, 1] [2021-11-23 02:30:26,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:27,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:27,171 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:27,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:27,172 INFO L85 PathProgramCache]: Analyzing trace with hash 1394943444, now seen corresponding path program 79 times [2021-11-23 02:30:27,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:27,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595172173] [2021-11-23 02:30:27,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:27,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:27,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:29,457 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2302 proven. 938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:29,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:29,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595172173] [2021-11-23 02:30:29,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1595172173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:29,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401311926] [2021-11-23 02:30:29,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:30:29,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:29,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:29,458 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:29,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 02:30:29,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:29,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-23 02:30:29,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:32,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:32,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:33,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3240 backedges. 2420 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:33,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401311926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109617947] [2021-11-23 02:30:33,143 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:33,143 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:33,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:33,143 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:33,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:33,236 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:33,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76735#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:33,730 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:33,730 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:33,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 126 [2021-11-23 02:30:33,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865850311] [2021-11-23 02:30:33,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:33,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-23 02:30:33,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:33,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-23 02:30:33,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3631, Invalid=13661, Unknown=0, NotChecked=0, Total=17292 [2021-11-23 02:30:33,733 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 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) [2021-11-23 02:30:35,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:35,627 INFO L93 Difference]: Finished difference Result 293 states and 295 transitions. [2021-11-23 02:30:35,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-23 02:30:35,627 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 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) Word has length 165 [2021-11-23 02:30:35,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:35,628 INFO L225 Difference]: With dead ends: 293 [2021-11-23 02:30:35,628 INFO L226 Difference]: Without dead ends: 167 [2021-11-23 02:30:35,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6879 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=6257, Invalid=23499, Unknown=0, NotChecked=0, Total=29756 [2021-11-23 02:30:35,632 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 5 mSDsluCounter, 413 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:35,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 455 Invalid, 930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:30:35,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-23 02:30:35,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-11-23 02:30:35,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0120481927710843) internal successors, (168), 166 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:35,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2021-11-23 02:30:35,677 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 165 [2021-11-23 02:30:35,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:35,678 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2021-11-23 02:30:35,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 2.3070866141732282) internal successors, (293), 126 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) [2021-11-23 02:30:35,678 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2021-11-23 02:30:35,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-23 02:30:35,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:35,680 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 1, 1, 1, 1] [2021-11-23 02:30:35,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:35,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable80 [2021-11-23 02:30:35,893 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:35,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:35,893 INFO L85 PathProgramCache]: Analyzing trace with hash 1060707535, now seen corresponding path program 80 times [2021-11-23 02:30:35,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:35,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504501036] [2021-11-23 02:30:35,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:35,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:35,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:36,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 820 proven. 2461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:36,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:36,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504501036] [2021-11-23 02:30:36,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504501036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:36,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623569491] [2021-11-23 02:30:36,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:30:36,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:36,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:36,795 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:36,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 02:30:37,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-23 02:30:37,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:37,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-23 02:30:37,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:37,370 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:37,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:37,742 INFO L134 CoverageAnalysis]: Checked inductivity of 3281 backedges. 861 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:37,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623569491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:37,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [449231480] [2021-11-23 02:30:37,744 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:37,744 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:37,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:37,744 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:37,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:37,842 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:38,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '78648#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:38,141 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:38,141 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:38,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 46 [2021-11-23 02:30:38,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761821013] [2021-11-23 02:30:38,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:38,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 02:30:38,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:38,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 02:30:38,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=975, Invalid=1677, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:30:38,143 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:39,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:39,131 INFO L93 Difference]: Finished difference Result 178 states and 179 transitions. [2021-11-23 02:30:39,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-23 02:30:39,132 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2021-11-23 02:30:39,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:39,133 INFO L225 Difference]: With dead ends: 178 [2021-11-23 02:30:39,133 INFO L226 Difference]: Without dead ends: 176 [2021-11-23 02:30:39,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 623 GetRequests, 528 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2306 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2956, Invalid=5974, Unknown=0, NotChecked=0, Total=8930 [2021-11-23 02:30:39,134 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 134 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:39,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 15 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:30:39,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-11-23 02:30:39,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 170. [2021-11-23 02:30:39,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:39,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2021-11-23 02:30:39,167 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 166 [2021-11-23 02:30:39,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:39,168 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2021-11-23 02:30:39,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.617021276595745) internal successors, (170), 46 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:39,168 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2021-11-23 02:30:39,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-23 02:30:39,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:39,169 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 1, 1, 1, 1] [2021-11-23 02:30:39,193 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 02:30:39,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:39,369 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:39,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:39,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1468598794, now seen corresponding path program 81 times [2021-11-23 02:30:39,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:39,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386053932] [2021-11-23 02:30:39,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:39,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:39,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:41,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2421 proven. 982 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:41,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:41,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386053932] [2021-11-23 02:30:41,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386053932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:41,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655453801] [2021-11-23 02:30:41,744 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:30:41,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:41,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:41,745 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:41,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 02:30:41,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:30:41,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:41,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-23 02:30:41,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:45,215 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:45,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:45,593 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 2542 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:45,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655453801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:45,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429431443] [2021-11-23 02:30:45,594 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:45,594 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:45,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:45,594 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:45,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:45,676 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:46,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80478#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:46,179 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:46,180 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:46,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 129 [2021-11-23 02:30:46,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965316786] [2021-11-23 02:30:46,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:46,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-23 02:30:46,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:46,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-23 02:30:46,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3803, Invalid=14287, Unknown=0, NotChecked=0, Total=18090 [2021-11-23 02:30:46,183 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:48,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:48,314 INFO L93 Difference]: Finished difference Result 300 states and 302 transitions. [2021-11-23 02:30:48,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-23 02:30:48,314 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 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 169 [2021-11-23 02:30:48,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:48,316 INFO L225 Difference]: With dead ends: 300 [2021-11-23 02:30:48,316 INFO L226 Difference]: Without dead ends: 171 [2021-11-23 02:30:48,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 457 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7194 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6556, Invalid=24596, Unknown=0, NotChecked=0, Total=31152 [2021-11-23 02:30:48,320 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 5 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 1291 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 1303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:48,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 645 Invalid, 1303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1291 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:30:48,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-23 02:30:48,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2021-11-23 02:30:48,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:48,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2021-11-23 02:30:48,368 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 169 [2021-11-23 02:30:48,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:48,368 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2021-11-23 02:30:48,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 2.3076923076923075) internal successors, (300), 129 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:48,369 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2021-11-23 02:30:48,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-23 02:30:48,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:48,371 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 1, 1, 1, 1] [2021-11-23 02:30:48,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:48,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:48,585 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:48,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:48,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1702687867, now seen corresponding path program 82 times [2021-11-23 02:30:48,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:48,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239116632] [2021-11-23 02:30:48,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:48,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:49,864 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 861 proven. 2584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:49,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:49,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239116632] [2021-11-23 02:30:49,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239116632] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:49,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912566604] [2021-11-23 02:30:49,865 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:30:49,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:49,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:49,866 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:49,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 02:30:50,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:50,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-23 02:30:50,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:50,441 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:50,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:50,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3445 backedges. 903 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:50,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912566604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:50,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1094379658] [2021-11-23 02:30:50,881 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:50,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:50,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:50,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:50,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:50,978 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:30:51,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82437#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:30:51,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:51,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:51,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 47 [2021-11-23 02:30:51,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569325279] [2021-11-23 02:30:51,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:51,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 02:30:51,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:51,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 02:30:51,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1019, Invalid=1737, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:30:51,266 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:52,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:52,328 INFO L93 Difference]: Finished difference Result 182 states and 183 transitions. [2021-11-23 02:30:52,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-23 02:30:52,328 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 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 170 [2021-11-23 02:30:52,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:52,329 INFO L225 Difference]: With dead ends: 182 [2021-11-23 02:30:52,330 INFO L226 Difference]: Without dead ends: 180 [2021-11-23 02:30:52,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 541 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2404 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3090, Invalid=6222, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 02:30:52,331 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 92 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:52,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 18 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:30:52,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-23 02:30:52,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 174. [2021-11-23 02:30:52,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 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) [2021-11-23 02:30:52,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2021-11-23 02:30:52,370 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 170 [2021-11-23 02:30:52,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:52,370 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2021-11-23 02:30:52,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.625) internal successors, (174), 47 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:30:52,370 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2021-11-23 02:30:52,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 02:30:52,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:52,372 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 1, 1, 1, 1] [2021-11-23 02:30:52,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:52,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:52,585 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:52,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:52,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1205659756, now seen corresponding path program 83 times [2021-11-23 02:30:52,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:52,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726598216] [2021-11-23 02:30:52,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:52,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:52,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:55,190 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2543 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:55,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:55,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726598216] [2021-11-23 02:30:55,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726598216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:55,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116072856] [2021-11-23 02:30:55,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:30:55,191 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:55,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:55,192 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:55,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 02:30:55,418 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-23 02:30:55,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:30:55,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-23 02:30:55,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:59,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:59,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:59,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 2667 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:30:59,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116072856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:59,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [290462066] [2021-11-23 02:30:59,407 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:30:59,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:59,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:59,408 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:59,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:59,496 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:00,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84310#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:00,043 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:00,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:00,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 132 [2021-11-23 02:31:00,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296330765] [2021-11-23 02:31:00,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:00,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 02:31:00,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:00,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 02:31:00,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3979, Invalid=14927, Unknown=0, NotChecked=0, Total=18906 [2021-11-23 02:31:00,046 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 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) [2021-11-23 02:31:02,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:02,062 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2021-11-23 02:31:02,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-23 02:31:02,063 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 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) Word has length 173 [2021-11-23 02:31:02,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:02,064 INFO L225 Difference]: With dead ends: 307 [2021-11-23 02:31:02,064 INFO L226 Difference]: Without dead ends: 175 [2021-11-23 02:31:02,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 647 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7516 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6862, Invalid=25718, Unknown=0, NotChecked=0, Total=32580 [2021-11-23 02:31:02,066 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 5 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:02,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 389 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:31:02,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-23 02:31:02,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-11-23 02:31:02,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 174 states have (on average 1.0114942528735633) internal successors, (176), 174 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:02,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2021-11-23 02:31:02,110 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2021-11-23 02:31:02,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:02,110 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2021-11-23 02:31:02,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.308270676691729) internal successors, (307), 132 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) [2021-11-23 02:31:02,111 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2021-11-23 02:31:02,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-23 02:31:02,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:02,113 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 1, 1, 1, 1] [2021-11-23 02:31:02,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:02,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable84 [2021-11-23 02:31:02,334 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:02,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:02,335 INFO L85 PathProgramCache]: Analyzing trace with hash 49931151, now seen corresponding path program 84 times [2021-11-23 02:31:02,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:02,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643450762] [2021-11-23 02:31:02,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:02,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:02,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 903 proven. 2710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:03,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:03,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643450762] [2021-11-23 02:31:03,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643450762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:03,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469745385] [2021-11-23 02:31:03,352 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:31:03,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:03,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:03,353 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:03,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 02:31:03,485 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:31:03,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:03,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-23 02:31:03,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:03,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:04,266 INFO L134 CoverageAnalysis]: Checked inductivity of 3613 backedges. 946 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:04,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469745385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:04,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077000117] [2021-11-23 02:31:04,268 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:04,268 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:04,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:04,269 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:04,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:04,354 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:04,648 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '86315#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:04,649 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:04,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:04,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 48 [2021-11-23 02:31:04,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316864165] [2021-11-23 02:31:04,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:04,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 02:31:04,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:04,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 02:31:04,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=1798, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:31:04,652 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:05,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:05,771 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2021-11-23 02:31:05,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-23 02:31:05,771 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2021-11-23 02:31:05,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:05,773 INFO L225 Difference]: With dead ends: 186 [2021-11-23 02:31:05,773 INFO L226 Difference]: Without dead ends: 184 [2021-11-23 02:31:05,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 554 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2504 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3227, Invalid=6475, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 02:31:05,774 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 138 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:05,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 14 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:31:05,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-23 02:31:05,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 178. [2021-11-23 02:31:05,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.0112994350282485) internal successors, (179), 177 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:05,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2021-11-23 02:31:05,814 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 174 [2021-11-23 02:31:05,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:05,814 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2021-11-23 02:31:05,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.63265306122449) internal successors, (178), 48 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:05,815 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2021-11-23 02:31:05,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-23 02:31:05,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:05,816 INFO L514 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 1, 1, 1, 1] [2021-11-23 02:31:05,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2021-11-23 02:31:06,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-11-23 02:31:06,016 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:06,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:06,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1445055306, now seen corresponding path program 85 times [2021-11-23 02:31:06,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:06,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318300442] [2021-11-23 02:31:06,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:06,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:06,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:08,677 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2668 proven. 1073 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:08,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:08,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318300442] [2021-11-23 02:31:08,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318300442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:08,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138747869] [2021-11-23 02:31:08,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:31:08,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:08,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:08,687 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:08,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 02:31:08,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:08,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-23 02:31:08,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:12,486 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:12,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:12,882 INFO L134 CoverageAnalysis]: Checked inductivity of 3741 backedges. 2795 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:12,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138747869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:12,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503677845] [2021-11-23 02:31:12,883 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:12,884 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:12,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:12,884 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:12,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:12,973 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:13,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88231#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:13,501 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:13,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:13,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 135 [2021-11-23 02:31:13,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041879116] [2021-11-23 02:31:13,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:13,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-23 02:31:13,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:13,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-23 02:31:13,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4159, Invalid=15581, Unknown=0, NotChecked=0, Total=19740 [2021-11-23 02:31:13,520 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:15,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:15,862 INFO L93 Difference]: Finished difference Result 314 states and 316 transitions. [2021-11-23 02:31:15,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-23 02:31:15,862 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 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 177 [2021-11-23 02:31:15,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:15,863 INFO L225 Difference]: With dead ends: 314 [2021-11-23 02:31:15,864 INFO L226 Difference]: Without dead ends: 179 [2021-11-23 02:31:15,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7845 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=7175, Invalid=26865, Unknown=0, NotChecked=0, Total=34040 [2021-11-23 02:31:15,866 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 5 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 1362 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:15,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 673 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1362 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:31:15,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-23 02:31:15,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-11-23 02:31:15,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0112359550561798) internal successors, (180), 178 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:15,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2021-11-23 02:31:15,919 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 177 [2021-11-23 02:31:15,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:15,919 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2021-11-23 02:31:15,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 2.3088235294117645) internal successors, (314), 135 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:15,920 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2021-11-23 02:31:15,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 02:31:15,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:15,921 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 1, 1, 1, 1] [2021-11-23 02:31:15,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-23 02:31:16,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2021-11-23 02:31:16,137 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:16,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:16,137 INFO L85 PathProgramCache]: Analyzing trace with hash -2140397115, now seen corresponding path program 86 times [2021-11-23 02:31:16,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:16,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062600877] [2021-11-23 02:31:16,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:16,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:16,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:17,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 946 proven. 2839 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:17,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:17,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062600877] [2021-11-23 02:31:17,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062600877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:17,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595482568] [2021-11-23 02:31:17,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:31:17,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:17,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:17,164 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:17,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 02:31:17,417 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2021-11-23 02:31:17,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:17,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-23 02:31:17,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:17,807 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:17,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:18,199 INFO L134 CoverageAnalysis]: Checked inductivity of 3785 backedges. 990 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:18,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595482568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:18,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [933481726] [2021-11-23 02:31:18,201 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:18,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:18,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:18,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:18,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:18,287 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:18,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90282#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:18,553 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:18,553 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:18,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 49 [2021-11-23 02:31:18,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264027334] [2021-11-23 02:31:18,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:18,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 02:31:18,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:18,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 02:31:18,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=1860, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:31:18,556 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:19,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:19,714 INFO L93 Difference]: Finished difference Result 190 states and 191 transitions. [2021-11-23 02:31:19,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-23 02:31:19,714 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2021-11-23 02:31:19,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:19,715 INFO L225 Difference]: With dead ends: 190 [2021-11-23 02:31:19,716 INFO L226 Difference]: Without dead ends: 188 [2021-11-23 02:31:19,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 567 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2606 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3367, Invalid=6733, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:31:19,717 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 185 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:19,717 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 17 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:31:19,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-23 02:31:19,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 182. [2021-11-23 02:31:19,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 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) [2021-11-23 02:31:19,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2021-11-23 02:31:19,753 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 178 [2021-11-23 02:31:19,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:19,753 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2021-11-23 02:31:19,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.64) internal successors, (182), 49 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:19,754 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2021-11-23 02:31:19,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-23 02:31:19,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:19,754 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 1, 1, 1, 1] [2021-11-23 02:31:19,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 02:31:19,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2021-11-23 02:31:19,955 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:19,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:19,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1481156268, now seen corresponding path program 87 times [2021-11-23 02:31:19,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:19,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870536221] [2021-11-23 02:31:19,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:19,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:20,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:22,693 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2796 proven. 1120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:22,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:22,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870536221] [2021-11-23 02:31:22,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870536221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:22,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688204965] [2021-11-23 02:31:22,694 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:31:22,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:22,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:22,695 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:22,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 02:31:22,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:31:22,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:22,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-23 02:31:22,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:26,719 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:26,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:27,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3916 backedges. 2926 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:27,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [688204965] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:27,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213338251] [2021-11-23 02:31:27,124 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:27,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:27,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:27,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:27,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:27,204 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:27,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92241#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:27,771 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:27,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:27,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 138 [2021-11-23 02:31:27,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705402598] [2021-11-23 02:31:27,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:27,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2021-11-23 02:31:27,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:27,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-11-23 02:31:27,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4343, Invalid=16249, Unknown=0, NotChecked=0, Total=20592 [2021-11-23 02:31:27,774 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 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) [2021-11-23 02:31:30,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:30,173 INFO L93 Difference]: Finished difference Result 321 states and 323 transitions. [2021-11-23 02:31:30,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-23 02:31:30,174 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 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) Word has length 181 [2021-11-23 02:31:30,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:30,176 INFO L225 Difference]: With dead ends: 321 [2021-11-23 02:31:30,176 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 02:31:30,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8181 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=7495, Invalid=28037, Unknown=0, NotChecked=0, Total=35532 [2021-11-23 02:31:30,180 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 5 mSDsluCounter, 634 mSDsCounter, 0 mSdLazyCounter, 1367 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 680 SdHoareTripleChecker+Invalid, 1376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:30,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 680 Invalid, 1376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1367 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:31:30,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 02:31:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2021-11-23 02:31:30,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.010989010989011) internal successors, (184), 182 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:30,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2021-11-23 02:31:30,250 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 181 [2021-11-23 02:31:30,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:30,250 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2021-11-23 02:31:30,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 2.3093525179856114) internal successors, (321), 138 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) [2021-11-23 02:31:30,251 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2021-11-23 02:31:30,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-23 02:31:30,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:30,253 INFO L514 BasicCegarLoop]: trace histogram [45, 45, 44, 44, 1, 1, 1, 1] [2021-11-23 02:31:30,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:30,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-11-23 02:31:30,469 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:30,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:30,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1605106255, now seen corresponding path program 88 times [2021-11-23 02:31:30,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:30,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514179583] [2021-11-23 02:31:30,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:30,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:30,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 990 proven. 2971 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:31,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:31,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514179583] [2021-11-23 02:31:31,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514179583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:31,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27225695] [2021-11-23 02:31:31,703 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:31:31,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:31,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:31,704 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:31,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 02:31:31,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:31,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-23 02:31:31,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:32,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:32,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 3961 backedges. 1035 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:32,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27225695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:32,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784179052] [2021-11-23 02:31:32,655 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:32,655 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:32,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:32,655 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:32,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:32,742 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:33,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94338#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:33,037 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:33,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:33,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 50 [2021-11-23 02:31:33,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890072215] [2021-11-23 02:31:33,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:33,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 02:31:33,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:33,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 02:31:33,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=1923, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:31:33,040 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:34,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:34,238 INFO L93 Difference]: Finished difference Result 194 states and 195 transitions. [2021-11-23 02:31:34,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-23 02:31:34,239 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 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 182 [2021-11-23 02:31:34,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:34,240 INFO L225 Difference]: With dead ends: 194 [2021-11-23 02:31:34,240 INFO L226 Difference]: Without dead ends: 192 [2021-11-23 02:31:34,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 580 SyntacticMatches, 2 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3510, Invalid=6996, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 02:31:34,241 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 145 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:34,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 20 Invalid, 661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:31:34,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-23 02:31:34,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 186. [2021-11-23 02:31:34,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 1.0108108108108107) internal successors, (187), 185 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:34,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2021-11-23 02:31:34,276 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 182 [2021-11-23 02:31:34,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:34,277 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2021-11-23 02:31:34,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.6470588235294117) internal successors, (186), 50 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:34,277 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2021-11-23 02:31:34,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-23 02:31:34,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:34,278 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 1, 1, 1, 1] [2021-11-23 02:31:34,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:34,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:34,489 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:34,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:34,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1854356618, now seen corresponding path program 89 times [2021-11-23 02:31:34,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:34,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208230181] [2021-11-23 02:31:34,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:34,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:34,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:37,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 2927 proven. 1168 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:37,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:37,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208230181] [2021-11-23 02:31:37,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208230181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:37,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680861828] [2021-11-23 02:31:37,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:31:37,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:37,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:37,361 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:37,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 02:31:37,611 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-23 02:31:37,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:37,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 94 conjunts are in the unsatisfiable core [2021-11-23 02:31:37,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:41,637 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:41,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:42,109 INFO L134 CoverageAnalysis]: Checked inductivity of 4095 backedges. 3060 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:42,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680861828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:42,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [164529465] [2021-11-23 02:31:42,111 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:42,111 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:42,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:42,111 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:42,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:42,215 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:42,797 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '96340#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:42,797 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:42,797 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:42,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 141 [2021-11-23 02:31:42,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850343678] [2021-11-23 02:31:42,798 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:42,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2021-11-23 02:31:42,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:42,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-11-23 02:31:42,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4531, Invalid=16931, Unknown=0, NotChecked=0, Total=21462 [2021-11-23 02:31:42,800 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:45,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:45,196 INFO L93 Difference]: Finished difference Result 328 states and 330 transitions. [2021-11-23 02:31:45,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-23 02:31:45,197 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 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 185 [2021-11-23 02:31:45,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:45,198 INFO L225 Difference]: With dead ends: 328 [2021-11-23 02:31:45,198 INFO L226 Difference]: Without dead ends: 187 [2021-11-23 02:31:45,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8524 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=7822, Invalid=29234, Unknown=0, NotChecked=0, Total=37056 [2021-11-23 02:31:45,200 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 5 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:45,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 570 Invalid, 1165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:31:45,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-23 02:31:45,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-11-23 02:31:45,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 186 states have (on average 1.010752688172043) internal successors, (188), 186 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:45,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2021-11-23 02:31:45,288 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2021-11-23 02:31:45,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:45,289 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2021-11-23 02:31:45,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 142 states, 142 states have (on average 2.3098591549295775) internal successors, (328), 141 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:45,289 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2021-11-23 02:31:45,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-11-23 02:31:45,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:45,291 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 1, 1, 1, 1] [2021-11-23 02:31:45,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 02:31:45,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:45,497 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:45,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:45,497 INFO L85 PathProgramCache]: Analyzing trace with hash -386078715, now seen corresponding path program 90 times [2021-11-23 02:31:45,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:45,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563689920] [2021-11-23 02:31:45,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:45,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:45,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:46,621 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1035 proven. 3106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:46,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:46,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563689920] [2021-11-23 02:31:46,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563689920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:46,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68712627] [2021-11-23 02:31:46,622 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:31:46,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:46,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:46,623 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:46,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 02:31:46,766 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:31:46,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:31:46,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-23 02:31:46,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:47,184 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:47,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:47,609 INFO L134 CoverageAnalysis]: Checked inductivity of 4141 backedges. 1081 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:47,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68712627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:47,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [596708567] [2021-11-23 02:31:47,610 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:47,610 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:47,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:47,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:47,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:47,721 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:48,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98483#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:48,019 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:48,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:48,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 51 [2021-11-23 02:31:48,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393562646] [2021-11-23 02:31:48,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:48,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 02:31:48,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:48,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 02:31:48,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=1987, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:31:48,022 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:49,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:31:49,295 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2021-11-23 02:31:49,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-11-23 02:31:49,296 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2021-11-23 02:31:49,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:31:49,297 INFO L225 Difference]: With dead ends: 198 [2021-11-23 02:31:49,297 INFO L226 Difference]: Without dead ends: 196 [2021-11-23 02:31:49,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 593 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2816 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3656, Invalid=7264, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 02:31:49,298 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 100 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:31:49,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 28 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:31:49,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-23 02:31:49,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 190. [2021-11-23 02:31:49,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0105820105820107) internal successors, (191), 189 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) [2021-11-23 02:31:49,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2021-11-23 02:31:49,334 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2021-11-23 02:31:49,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:31:49,334 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2021-11-23 02:31:49,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 3.6538461538461537) internal successors, (190), 51 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:31:49,334 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2021-11-23 02:31:49,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 02:31:49,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:31:49,336 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 1, 1, 1, 1] [2021-11-23 02:31:49,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2021-11-23 02:31:49,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable91 [2021-11-23 02:31:49,536 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:31:49,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:31:49,537 INFO L85 PathProgramCache]: Analyzing trace with hash 256240404, now seen corresponding path program 91 times [2021-11-23 02:31:49,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:31:49,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107989049] [2021-11-23 02:31:49,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:31:49,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:31:49,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:52,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3061 proven. 1217 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:52,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:31:52,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107989049] [2021-11-23 02:31:52,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107989049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:31:52,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434169061] [2021-11-23 02:31:52,580 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:31:52,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:31:52,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:31:52,581 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:31:52,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 02:31:52,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:31:52,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-23 02:31:52,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:31:57,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:57,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:31:57,555 INFO L134 CoverageAnalysis]: Checked inductivity of 4278 backedges. 3197 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:31:57,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434169061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:31:57,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [290196100] [2021-11-23 02:31:57,557 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:31:57,557 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:31:57,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:31:57,558 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:31:57,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:57,645 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:31:58,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100528#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:31:58,253 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:31:58,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:31:58,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 144 [2021-11-23 02:31:58,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904956191] [2021-11-23 02:31:58,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:31:58,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-23 02:31:58,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:31:58,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-23 02:31:58,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4723, Invalid=17627, Unknown=0, NotChecked=0, Total=22350 [2021-11-23 02:31:58,257 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:00,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:00,673 INFO L93 Difference]: Finished difference Result 335 states and 337 transitions. [2021-11-23 02:32:00,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-23 02:32:00,674 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 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 189 [2021-11-23 02:32:00,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:00,675 INFO L225 Difference]: With dead ends: 335 [2021-11-23 02:32:00,675 INFO L226 Difference]: Without dead ends: 191 [2021-11-23 02:32:00,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 707 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8874 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=8156, Invalid=30456, Unknown=0, NotChecked=0, Total=38612 [2021-11-23 02:32:00,677 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 5 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 1119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:00,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 546 Invalid, 1119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:32:00,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-23 02:32:00,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-23 02:32:00,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0105263157894737) internal successors, (192), 190 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:00,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 192 transitions. [2021-11-23 02:32:00,714 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 192 transitions. Word has length 189 [2021-11-23 02:32:00,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:00,714 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 192 transitions. [2021-11-23 02:32:00,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 2.310344827586207) internal successors, (335), 144 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:00,715 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 192 transitions. [2021-11-23 02:32:00,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-11-23 02:32:00,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:00,716 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 1, 1, 1, 1] [2021-11-23 02:32:00,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:00,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:00,929 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:00,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:00,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1212980977, now seen corresponding path program 92 times [2021-11-23 02:32:00,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:00,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019244054] [2021-11-23 02:32:00,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:00,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:00,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:02,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1081 proven. 3244 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:02,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:02,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019244054] [2021-11-23 02:32:02,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019244054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:02,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471633803] [2021-11-23 02:32:02,097 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:32:02,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:02,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:02,098 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:02,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 02:32:02,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-23 02:32:02,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:02,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-23 02:32:02,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:02,796 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:02,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:03,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4325 backedges. 1128 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:03,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471633803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:03,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [928258982] [2021-11-23 02:32:03,198 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:03,198 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:03,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:03,198 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:03,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:03,263 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:03,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102717#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:03,556 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:03,556 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:03,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2021-11-23 02:32:03,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202787842] [2021-11-23 02:32:03,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:03,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-23 02:32:03,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:03,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-23 02:32:03,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1254, Invalid=2052, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 02:32:03,558 INFO L87 Difference]: Start difference. First operand 191 states and 192 transitions. Second operand has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:04,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:04,778 INFO L93 Difference]: Finished difference Result 202 states and 203 transitions. [2021-11-23 02:32:04,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-23 02:32:04,779 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 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 190 [2021-11-23 02:32:04,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:04,780 INFO L225 Difference]: With dead ends: 202 [2021-11-23 02:32:04,780 INFO L226 Difference]: Without dead ends: 200 [2021-11-23 02:32:04,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 713 GetRequests, 606 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2924 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3805, Invalid=7537, Unknown=0, NotChecked=0, Total=11342 [2021-11-23 02:32:04,781 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 201 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:04,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 21 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:32:04,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-23 02:32:04,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 194. [2021-11-23 02:32:04,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 193 states have (on average 1.0103626943005182) internal successors, (195), 193 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) [2021-11-23 02:32:04,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 195 transitions. [2021-11-23 02:32:04,816 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 195 transitions. Word has length 190 [2021-11-23 02:32:04,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:04,817 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 195 transitions. [2021-11-23 02:32:04,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.660377358490566) internal successors, (194), 52 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:04,817 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 195 transitions. [2021-11-23 02:32:04,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-11-23 02:32:04,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:04,818 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 1, 1, 1, 1] [2021-11-23 02:32:04,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:05,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:05,019 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:05,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:05,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1943363018, now seen corresponding path program 93 times [2021-11-23 02:32:05,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:05,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191852687] [2021-11-23 02:32:05,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:05,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:05,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:07,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3198 proven. 1267 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:07,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:07,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191852687] [2021-11-23 02:32:07,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191852687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:07,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134673048] [2021-11-23 02:32:07,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:32:07,795 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:07,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:07,795 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:07,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 02:32:07,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:32:07,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:07,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-23 02:32:07,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:11,434 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:11,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:11,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 3337 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:11,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134673048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:11,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [251939161] [2021-11-23 02:32:11,774 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:11,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:11,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:11,775 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:11,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:11,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:12,294 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104805#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:12,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:12,294 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:12,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 147 [2021-11-23 02:32:12,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981056148] [2021-11-23 02:32:12,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:12,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-23 02:32:12,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:12,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-23 02:32:12,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4919, Invalid=18337, Unknown=0, NotChecked=0, Total=23256 [2021-11-23 02:32:12,297 INFO L87 Difference]: Start difference. First operand 194 states and 195 transitions. Second operand has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:14,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:14,428 INFO L93 Difference]: Finished difference Result 342 states and 344 transitions. [2021-11-23 02:32:14,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-23 02:32:14,429 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 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 193 [2021-11-23 02:32:14,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:14,430 INFO L225 Difference]: With dead ends: 342 [2021-11-23 02:32:14,430 INFO L226 Difference]: Without dead ends: 195 [2021-11-23 02:32:14,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 523 SyntacticMatches, 0 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9231 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=8497, Invalid=31703, Unknown=0, NotChecked=0, Total=40200 [2021-11-23 02:32:14,432 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 5 mSDsluCounter, 521 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:14,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 570 Invalid, 1171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:32:14,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-23 02:32:14,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-11-23 02:32:14,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0103092783505154) internal successors, (196), 194 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) [2021-11-23 02:32:14,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2021-11-23 02:32:14,463 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 193 [2021-11-23 02:32:14,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:14,463 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2021-11-23 02:32:14,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 2.310810810810811) internal successors, (342), 147 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:14,463 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2021-11-23 02:32:14,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-23 02:32:14,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:14,465 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 1, 1, 1, 1] [2021-11-23 02:32:14,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-23 02:32:14,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:14,665 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:14,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:14,666 INFO L85 PathProgramCache]: Analyzing trace with hash -1672389051, now seen corresponding path program 94 times [2021-11-23 02:32:14,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:14,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66848474] [2021-11-23 02:32:14,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:14,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:14,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:15,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1128 proven. 3385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:15,695 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:15,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66848474] [2021-11-23 02:32:15,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66848474] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:15,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040253395] [2021-11-23 02:32:15,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:32:15,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:15,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:15,697 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:15,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 02:32:15,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:15,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 748 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-23 02:32:15,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:16,148 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:16,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:16,490 INFO L134 CoverageAnalysis]: Checked inductivity of 4513 backedges. 1176 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:16,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040253395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:16,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1908552490] [2021-11-23 02:32:16,491 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:16,491 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:16,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:16,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:16,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:16,563 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:16,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107040#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:16,792 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:16,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:16,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 53 [2021-11-23 02:32:16,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890429514] [2021-11-23 02:32:16,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:16,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-23 02:32:16,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:16,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-23 02:32:16,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2118, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 02:32:16,793 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 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) [2021-11-23 02:32:17,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:17,877 INFO L93 Difference]: Finished difference Result 206 states and 207 transitions. [2021-11-23 02:32:17,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-23 02:32:17,877 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 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 194 [2021-11-23 02:32:17,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:17,878 INFO L225 Difference]: With dead ends: 206 [2021-11-23 02:32:17,878 INFO L226 Difference]: Without dead ends: 204 [2021-11-23 02:32:17,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 728 GetRequests, 619 SyntacticMatches, 2 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3034 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3957, Invalid=7815, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 02:32:17,879 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 157 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:17,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 20 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:32:17,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-11-23 02:32:17,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 198. [2021-11-23 02:32:17,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:17,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2021-11-23 02:32:17,920 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 194 [2021-11-23 02:32:17,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:17,920 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2021-11-23 02:32:17,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.6666666666666665) internal successors, (198), 53 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) [2021-11-23 02:32:17,920 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2021-11-23 02:32:17,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-11-23 02:32:17,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:17,921 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 1, 1, 1, 1] [2021-11-23 02:32:17,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:18,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2021-11-23 02:32:18,122 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:18,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:18,122 INFO L85 PathProgramCache]: Analyzing trace with hash -516764460, now seen corresponding path program 95 times [2021-11-23 02:32:18,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:18,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468395007] [2021-11-23 02:32:18,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:18,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:20,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3338 proven. 1318 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:20,830 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:20,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468395007] [2021-11-23 02:32:20,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468395007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:20,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690798476] [2021-11-23 02:32:20,830 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:32:20,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:20,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:20,831 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:20,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 02:32:21,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2021-11-23 02:32:21,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:21,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-23 02:32:21,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:24,742 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:24,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:25,136 INFO L134 CoverageAnalysis]: Checked inductivity of 4656 backedges. 3480 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:25,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690798476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:25,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119398929] [2021-11-23 02:32:25,137 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:25,137 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:25,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:25,138 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:25,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:25,207 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:25,714 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109171#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:25,715 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:25,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:25,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 150 [2021-11-23 02:32:25,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770565971] [2021-11-23 02:32:25,715 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:25,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2021-11-23 02:32:25,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:25,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2021-11-23 02:32:25,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5119, Invalid=19061, Unknown=0, NotChecked=0, Total=24180 [2021-11-23 02:32:25,718 INFO L87 Difference]: Start difference. First operand 198 states and 199 transitions. Second operand has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:27,908 INFO L93 Difference]: Finished difference Result 349 states and 351 transitions. [2021-11-23 02:32:27,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-23 02:32:27,908 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 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 197 [2021-11-23 02:32:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:27,909 INFO L225 Difference]: With dead ends: 349 [2021-11-23 02:32:27,910 INFO L226 Difference]: Without dead ends: 199 [2021-11-23 02:32:27,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 534 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9595 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=8845, Invalid=32975, Unknown=0, NotChecked=0, Total=41820 [2021-11-23 02:32:27,912 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 5 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1147 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:27,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 570 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1147 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:32:27,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-23 02:32:27,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-11-23 02:32:27,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 198 states have (on average 1.0101010101010102) internal successors, (200), 198 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:27,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2021-11-23 02:32:27,961 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 197 [2021-11-23 02:32:27,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:27,961 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2021-11-23 02:32:27,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 2.3112582781456954) internal successors, (349), 150 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:27,961 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2021-11-23 02:32:27,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-11-23 02:32:27,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:27,962 INFO L514 BasicCegarLoop]: trace histogram [49, 49, 48, 48, 1, 1, 1, 1] [2021-11-23 02:32:27,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-23 02:32:28,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2021-11-23 02:32:28,163 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:28,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:28,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1920210895, now seen corresponding path program 96 times [2021-11-23 02:32:28,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:28,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294522825] [2021-11-23 02:32:28,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:28,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:28,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:29,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1176 proven. 3529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:29,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:29,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294522825] [2021-11-23 02:32:29,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294522825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:29,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947876081] [2021-11-23 02:32:29,190 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:32:29,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:29,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:29,191 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:29,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 02:32:29,313 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:32:29,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:29,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-23 02:32:29,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:29,690 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:29,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:30,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4705 backedges. 1225 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:30,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947876081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:30,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945947412] [2021-11-23 02:32:30,037 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:30,037 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:30,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:30,037 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:30,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:30,112 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:30,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111452#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:30,349 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:30,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:30,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 54 [2021-11-23 02:32:30,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315574839] [2021-11-23 02:32:30,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:30,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:32:30,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:30,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:32:30,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1355, Invalid=2185, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:32:30,351 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:31,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:31,450 INFO L93 Difference]: Finished difference Result 210 states and 211 transitions. [2021-11-23 02:32:31,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-11-23 02:32:31,450 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 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 198 [2021-11-23 02:32:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:31,451 INFO L225 Difference]: With dead ends: 210 [2021-11-23 02:32:31,451 INFO L226 Difference]: Without dead ends: 208 [2021-11-23 02:32:31,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 632 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3146 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=4112, Invalid=8098, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 02:32:31,452 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 208 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 249 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 249 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:31,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 17 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [249 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:32:31,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-23 02:32:31,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 202. [2021-11-23 02:32:31,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.0099502487562189) internal successors, (203), 201 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) [2021-11-23 02:32:31,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2021-11-23 02:32:31,487 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 198 [2021-11-23 02:32:31,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:31,488 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2021-11-23 02:32:31,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 54 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:31,488 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2021-11-23 02:32:31,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-23 02:32:31,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:31,489 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 1, 1, 1, 1] [2021-11-23 02:32:31,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:31,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-11-23 02:32:31,689 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:31,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:31,690 INFO L85 PathProgramCache]: Analyzing trace with hash 338177802, now seen corresponding path program 97 times [2021-11-23 02:32:31,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:31,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605417902] [2021-11-23 02:32:31,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:31,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:31,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:34,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3481 proven. 1370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:34,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:34,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605417902] [2021-11-23 02:32:34,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605417902] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:34,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700043447] [2021-11-23 02:32:34,463 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:32:34,463 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:34,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:34,464 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:34,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 02:32:34,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:34,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-23 02:32:34,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:38,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:38,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:38,942 INFO L134 CoverageAnalysis]: Checked inductivity of 4851 backedges. 3626 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:38,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700043447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:38,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1221701463] [2021-11-23 02:32:38,943 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:38,944 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:38,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:38,944 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:38,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:39,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:39,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '113626#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:39,514 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:39,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:39,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 153 [2021-11-23 02:32:39,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063511830] [2021-11-23 02:32:39,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:39,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-23 02:32:39,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:39,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-23 02:32:39,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5323, Invalid=19799, Unknown=0, NotChecked=0, Total=25122 [2021-11-23 02:32:39,517 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 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) [2021-11-23 02:32:41,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:41,834 INFO L93 Difference]: Finished difference Result 356 states and 358 transitions. [2021-11-23 02:32:41,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-23 02:32:41,834 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 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 201 [2021-11-23 02:32:41,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:41,835 INFO L225 Difference]: With dead ends: 356 [2021-11-23 02:32:41,835 INFO L226 Difference]: Without dead ends: 203 [2021-11-23 02:32:41,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 752 GetRequests, 545 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9966 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=9200, Invalid=34272, Unknown=0, NotChecked=0, Total=43472 [2021-11-23 02:32:41,841 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 5 mSDsluCounter, 513 mSDsCounter, 0 mSdLazyCounter, 1141 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 1151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:41,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 564 Invalid, 1151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1141 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:32:41,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-11-23 02:32:41,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2021-11-23 02:32:41,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.00990099009901) internal successors, (204), 202 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:41,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 204 transitions. [2021-11-23 02:32:41,874 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 204 transitions. Word has length 201 [2021-11-23 02:32:41,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:41,874 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 204 transitions. [2021-11-23 02:32:41,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 2.311688311688312) internal successors, (356), 153 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) [2021-11-23 02:32:41,874 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 204 transitions. [2021-11-23 02:32:41,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-23 02:32:41,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:41,875 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 1, 1, 1, 1] [2021-11-23 02:32:41,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:42,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2021-11-23 02:32:42,081 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:42,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:42,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1032160389, now seen corresponding path program 98 times [2021-11-23 02:32:42,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:42,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160240011] [2021-11-23 02:32:42,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:42,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:42,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:43,320 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1225 proven. 3676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:43,320 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:43,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160240011] [2021-11-23 02:32:43,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160240011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:43,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390973888] [2021-11-23 02:32:43,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:32:43,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:43,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:43,321 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:43,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 02:32:43,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2021-11-23 02:32:43,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:43,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-23 02:32:43,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:44,037 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:44,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:44,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4901 backedges. 1275 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:44,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390973888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:44,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077610632] [2021-11-23 02:32:44,445 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:44,445 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:44,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:44,446 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:44,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:44,503 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:44,756 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115953#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:44,756 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:44,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:44,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 55 [2021-11-23 02:32:44,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138067176] [2021-11-23 02:32:44,757 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:44,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 02:32:44,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:44,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 02:32:44,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=2253, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:32:44,759 INFO L87 Difference]: Start difference. First operand 203 states and 204 transitions. Second operand has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:45,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:45,955 INFO L93 Difference]: Finished difference Result 214 states and 215 transitions. [2021-11-23 02:32:45,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-23 02:32:45,956 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 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 202 [2021-11-23 02:32:45,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:45,957 INFO L225 Difference]: With dead ends: 214 [2021-11-23 02:32:45,957 INFO L226 Difference]: Without dead ends: 212 [2021-11-23 02:32:45,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 645 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3260 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4270, Invalid=8386, Unknown=0, NotChecked=0, Total=12656 [2021-11-23 02:32:45,958 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 211 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:45,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 17 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:32:45,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-23 02:32:46,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 206. [2021-11-23 02:32:46,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.0097560975609756) internal successors, (207), 205 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) [2021-11-23 02:32:46,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2021-11-23 02:32:46,019 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 202 [2021-11-23 02:32:46,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:46,019 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2021-11-23 02:32:46,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.6785714285714284) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:46,019 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2021-11-23 02:32:46,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-11-23 02:32:46,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:46,020 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 1, 1, 1, 1] [2021-11-23 02:32:46,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:46,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2021-11-23 02:32:46,221 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:46,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:46,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1424096916, now seen corresponding path program 99 times [2021-11-23 02:32:46,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:46,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804853511] [2021-11-23 02:32:46,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:46,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:46,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:49,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3627 proven. 1423 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:49,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:49,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804853511] [2021-11-23 02:32:49,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804853511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:49,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247412627] [2021-11-23 02:32:49,213 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:32:49,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:49,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:49,214 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:49,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 02:32:49,349 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:32:49,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:32:49,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-23 02:32:49,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:53,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:53,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:53,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5050 backedges. 3775 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:53,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247412627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:53,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091161559] [2021-11-23 02:32:53,750 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:53,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:53,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:53,751 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:53,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:53,828 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:54,315 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118170#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:54,315 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:54,315 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:54,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 156 [2021-11-23 02:32:54,316 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702842211] [2021-11-23 02:32:54,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:54,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2021-11-23 02:32:54,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:54,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2021-11-23 02:32:54,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5531, Invalid=20551, Unknown=0, NotChecked=0, Total=26082 [2021-11-23 02:32:54,318 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 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) [2021-11-23 02:32:56,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:32:56,842 INFO L93 Difference]: Finished difference Result 363 states and 365 transitions. [2021-11-23 02:32:56,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-23 02:32:56,843 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 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 205 [2021-11-23 02:32:56,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:32:56,844 INFO L225 Difference]: With dead ends: 363 [2021-11-23 02:32:56,844 INFO L226 Difference]: Without dead ends: 207 [2021-11-23 02:32:56,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 767 GetRequests, 556 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10344 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=9562, Invalid=35594, Unknown=0, NotChecked=0, Total=45156 [2021-11-23 02:32:56,850 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 5 mSDsluCounter, 510 mSDsCounter, 0 mSdLazyCounter, 1144 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:32:56,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 562 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1144 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:32:56,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-23 02:32:56,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-11-23 02:32:56,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0097087378640777) internal successors, (208), 206 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:32:56,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2021-11-23 02:32:56,893 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 205 [2021-11-23 02:32:56,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:32:56,893 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2021-11-23 02:32:56,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 2.3121019108280256) internal successors, (363), 156 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) [2021-11-23 02:32:56,893 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2021-11-23 02:32:56,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-23 02:32:56,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:32:56,894 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 50, 50, 1, 1, 1, 1] [2021-11-23 02:32:56,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-23 02:32:57,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2021-11-23 02:32:57,095 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:32:57,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:32:57,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1012014735, now seen corresponding path program 100 times [2021-11-23 02:32:57,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:32:57,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101351357] [2021-11-23 02:32:57,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:32:57,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:32:57,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:58,222 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1275 proven. 3826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:58,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:32:58,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101351357] [2021-11-23 02:32:58,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101351357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:32:58,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417398287] [2021-11-23 02:32:58,223 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:32:58,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:32:58,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:32:58,223 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:32:58,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-23 02:32:58,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:32:58,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-23 02:32:58,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:32:58,824 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:58,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:32:59,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5101 backedges. 1326 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:32:59,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417398287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:32:59,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149589358] [2021-11-23 02:32:59,252 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:32:59,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:32:59,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:32:59,252 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:32:59,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:32:59,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:59,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120543#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:32:59,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:59,598 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:59,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 56 [2021-11-23 02:32:59,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512287794] [2021-11-23 02:32:59,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:59,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 02:32:59,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:59,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 02:32:59,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1460, Invalid=2322, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 02:32:59,600 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:00,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:00,906 INFO L93 Difference]: Finished difference Result 218 states and 219 transitions. [2021-11-23 02:33:00,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-23 02:33:00,906 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 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 206 [2021-11-23 02:33:00,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:00,907 INFO L225 Difference]: With dead ends: 218 [2021-11-23 02:33:00,907 INFO L226 Difference]: Without dead ends: 216 [2021-11-23 02:33:00,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 658 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4431, Invalid=8679, Unknown=0, NotChecked=0, Total=13110 [2021-11-23 02:33:00,908 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 215 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 259 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 259 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:00,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 17 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [259 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:33:00,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-23 02:33:00,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 210. [2021-11-23 02:33:00,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:00,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2021-11-23 02:33:00,946 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 206 [2021-11-23 02:33:00,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:00,946 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2021-11-23 02:33:00,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.6842105263157894) internal successors, (210), 56 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:00,946 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2021-11-23 02:33:00,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-23 02:33:00,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:00,947 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 1, 1, 1, 1] [2021-11-23 02:33:00,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Ended with exit code 0 [2021-11-23 02:33:01,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-11-23 02:33:01,147 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:01,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:01,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1734627254, now seen corresponding path program 101 times [2021-11-23 02:33:01,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:01,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393496737] [2021-11-23 02:33:01,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:01,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:01,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:04,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3776 proven. 1477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:04,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:04,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393496737] [2021-11-23 02:33:04,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393496737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:04,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091956101] [2021-11-23 02:33:04,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:04,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:04,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:04,132 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:04,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 02:33:04,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-23 02:33:04,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:04,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 803 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-23 02:33:04,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:08,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:08,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:08,982 INFO L134 CoverageAnalysis]: Checked inductivity of 5253 backedges. 3927 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:08,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2091956101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:08,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245084577] [2021-11-23 02:33:08,983 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:08,983 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:08,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:08,984 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:08,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:09,048 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:09,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122803#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:09,563 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:09,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:09,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 159 [2021-11-23 02:33:09,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373602840] [2021-11-23 02:33:09,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:09,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2021-11-23 02:33:09,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:09,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2021-11-23 02:33:09,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5743, Invalid=21317, Unknown=0, NotChecked=0, Total=27060 [2021-11-23 02:33:09,566 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:12,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:12,086 INFO L93 Difference]: Finished difference Result 370 states and 372 transitions. [2021-11-23 02:33:12,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-23 02:33:12,086 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 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 209 [2021-11-23 02:33:12,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:12,087 INFO L225 Difference]: With dead ends: 370 [2021-11-23 02:33:12,087 INFO L226 Difference]: Without dead ends: 211 [2021-11-23 02:33:12,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 567 SyntacticMatches, 0 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10729 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=9931, Invalid=36941, Unknown=0, NotChecked=0, Total=46872 [2021-11-23 02:33:12,090 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 5 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 1213 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 1223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:12,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 593 Invalid, 1223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1213 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:33:12,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-23 02:33:12,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-23 02:33:12,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 1.0095238095238095) internal successors, (212), 210 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:12,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 212 transitions. [2021-11-23 02:33:12,151 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 212 transitions. Word has length 209 [2021-11-23 02:33:12,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:12,151 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 212 transitions. [2021-11-23 02:33:12,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 2.3125) internal successors, (370), 159 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:12,152 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 212 transitions. [2021-11-23 02:33:12,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-23 02:33:12,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:12,153 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 1, 1, 1, 1] [2021-11-23 02:33:12,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:12,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-11-23 02:33:12,356 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:12,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:12,357 INFO L85 PathProgramCache]: Analyzing trace with hash 179657413, now seen corresponding path program 102 times [2021-11-23 02:33:12,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:12,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849164803] [2021-11-23 02:33:12,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:12,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:12,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:13,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1326 proven. 3979 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:13,667 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:13,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849164803] [2021-11-23 02:33:13,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849164803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:13,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171668503] [2021-11-23 02:33:13,667 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:33:13,667 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:13,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:13,668 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:13,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 02:33:13,799 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:33:13,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:13,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 808 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-23 02:33:13,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:14,212 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:14,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:14,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5305 backedges. 1378 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:14,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171668503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:14,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963086861] [2021-11-23 02:33:14,599 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:14,600 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:14,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:14,600 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:14,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:14,675 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:14,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125222#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:14,928 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:14,929 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:14,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2021-11-23 02:33:14,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130044853] [2021-11-23 02:33:14,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:14,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-23 02:33:14,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:14,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-23 02:33:14,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=2392, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 02:33:14,931 INFO L87 Difference]: Start difference. First operand 211 states and 212 transitions. Second operand has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:16,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:16,229 INFO L93 Difference]: Finished difference Result 222 states and 223 transitions. [2021-11-23 02:33:16,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-23 02:33:16,229 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 210 [2021-11-23 02:33:16,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:16,230 INFO L225 Difference]: With dead ends: 222 [2021-11-23 02:33:16,230 INFO L226 Difference]: Without dead ends: 220 [2021-11-23 02:33:16,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 788 GetRequests, 671 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3494 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4595, Invalid=8977, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 02:33:16,231 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 216 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:16,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 21 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [264 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:33:16,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-23 02:33:16,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2021-11-23 02:33:16,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 213 states have (on average 1.0093896713615023) internal successors, (215), 213 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) [2021-11-23 02:33:16,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2021-11-23 02:33:16,270 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 210 [2021-11-23 02:33:16,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:16,270 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2021-11-23 02:33:16,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.689655172413793) internal successors, (214), 57 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:16,271 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2021-11-23 02:33:16,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-23 02:33:16,272 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:16,272 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 1, 1, 1, 1] [2021-11-23 02:33:16,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:16,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2021-11-23 02:33:16,485 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:16,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:16,485 INFO L85 PathProgramCache]: Analyzing trace with hash 649560148, now seen corresponding path program 103 times [2021-11-23 02:33:16,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:16,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519143128] [2021-11-23 02:33:16,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:16,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:16,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:19,735 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 3928 proven. 1532 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:19,735 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:19,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519143128] [2021-11-23 02:33:19,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519143128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:19,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874276802] [2021-11-23 02:33:19,736 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:33:19,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:19,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:19,737 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:19,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-23 02:33:19,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:19,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-23 02:33:19,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:24,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:24,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:24,792 INFO L134 CoverageAnalysis]: Checked inductivity of 5460 backedges. 4082 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:24,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874276802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:24,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1256620509] [2021-11-23 02:33:24,793 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:24,793 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:24,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:24,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:24,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:24,849 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:25,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '127525#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:25,416 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:25,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:25,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 162 [2021-11-23 02:33:25,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460924679] [2021-11-23 02:33:25,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:25,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2021-11-23 02:33:25,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:25,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2021-11-23 02:33:25,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5959, Invalid=22097, Unknown=0, NotChecked=0, Total=28056 [2021-11-23 02:33:25,421 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 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) [2021-11-23 02:33:27,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:27,993 INFO L93 Difference]: Finished difference Result 377 states and 379 transitions. [2021-11-23 02:33:27,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-23 02:33:27,993 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 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) Word has length 213 [2021-11-23 02:33:27,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:27,994 INFO L225 Difference]: With dead ends: 377 [2021-11-23 02:33:27,994 INFO L226 Difference]: Without dead ends: 215 [2021-11-23 02:33:27,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11121 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=10307, Invalid=38313, Unknown=0, NotChecked=0, Total=48620 [2021-11-23 02:33:27,996 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 5 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 1192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:27,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 580 Invalid, 1192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:33:27,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-11-23 02:33:28,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2021-11-23 02:33:28,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.0093457943925233) internal successors, (216), 214 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) [2021-11-23 02:33:28,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 216 transitions. [2021-11-23 02:33:28,045 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 216 transitions. Word has length 213 [2021-11-23 02:33:28,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:28,045 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 216 transitions. [2021-11-23 02:33:28,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.312883435582822) internal successors, (377), 162 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) [2021-11-23 02:33:28,045 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 216 transitions. [2021-11-23 02:33:28,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-23 02:33:28,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:28,046 INFO L514 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 1, 1, 1, 1] [2021-11-23 02:33:28,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:28,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:28,247 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:28,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:28,247 INFO L85 PathProgramCache]: Analyzing trace with hash 1186035023, now seen corresponding path program 104 times [2021-11-23 02:33:28,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:28,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786824121] [2021-11-23 02:33:28,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:28,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:28,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:29,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1378 proven. 4135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:29,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:29,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786824121] [2021-11-23 02:33:29,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786824121] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:29,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575839143] [2021-11-23 02:33:29,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:29,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:29,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:29,562 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:29,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 02:33:29,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2021-11-23 02:33:29,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:29,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-23 02:33:29,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:30,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:30,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:30,660 INFO L134 CoverageAnalysis]: Checked inductivity of 5513 backedges. 1431 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:30,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575839143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:30,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1896633926] [2021-11-23 02:33:30,662 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:30,662 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:30,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:30,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:30,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:30,744 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:31,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '129990#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:31,032 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:31,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:31,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 58 [2021-11-23 02:33:31,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742820184] [2021-11-23 02:33:31,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:31,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-23 02:33:31,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:31,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-23 02:33:31,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1569, Invalid=2463, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 02:33:31,034 INFO L87 Difference]: Start difference. First operand 215 states and 216 transitions. Second operand has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 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) [2021-11-23 02:33:32,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:32,320 INFO L93 Difference]: Finished difference Result 226 states and 227 transitions. [2021-11-23 02:33:32,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-23 02:33:32,320 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 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 214 [2021-11-23 02:33:32,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:32,321 INFO L225 Difference]: With dead ends: 226 [2021-11-23 02:33:32,321 INFO L226 Difference]: Without dead ends: 224 [2021-11-23 02:33:32,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 684 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4762, Invalid=9280, Unknown=0, NotChecked=0, Total=14042 [2021-11-23 02:33:32,323 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 171 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:32,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 13 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:33:32,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-23 02:33:32,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 218. [2021-11-23 02:33:32,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.0092165898617511) internal successors, (219), 217 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) [2021-11-23 02:33:32,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 219 transitions. [2021-11-23 02:33:32,372 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 219 transitions. Word has length 214 [2021-11-23 02:33:32,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:32,372 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 219 transitions. [2021-11-23 02:33:32,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.694915254237288) internal successors, (218), 58 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) [2021-11-23 02:33:32,372 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 219 transitions. [2021-11-23 02:33:32,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-11-23 02:33:32,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:32,373 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 1, 1, 1, 1] [2021-11-23 02:33:32,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:32,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-11-23 02:33:32,574 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:32,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:32,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1521753718, now seen corresponding path program 105 times [2021-11-23 02:33:32,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:32,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722682345] [2021-11-23 02:33:32,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:32,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:32,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:35,972 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4083 proven. 1588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:35,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:35,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722682345] [2021-11-23 02:33:35,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722682345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:35,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919681817] [2021-11-23 02:33:35,972 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:33:35,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:35,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:35,973 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:35,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 02:33:36,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:33:36,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:36,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 833 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-23 02:33:36,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:40,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:40,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:41,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5671 backedges. 4240 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:41,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919681817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:41,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1481559812] [2021-11-23 02:33:41,337 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:41,337 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:41,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:41,337 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:41,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:41,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:42,086 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '132336#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:42,086 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:42,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:42,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 165 [2021-11-23 02:33:42,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869944950] [2021-11-23 02:33:42,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:42,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2021-11-23 02:33:42,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:42,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2021-11-23 02:33:42,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6179, Invalid=22891, Unknown=0, NotChecked=0, Total=29070 [2021-11-23 02:33:42,090 INFO L87 Difference]: Start difference. First operand 218 states and 219 transitions. Second operand has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:45,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:45,090 INFO L93 Difference]: Finished difference Result 384 states and 386 transitions. [2021-11-23 02:33:45,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-11-23 02:33:45,091 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 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 217 [2021-11-23 02:33:45,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:45,091 INFO L225 Difference]: With dead ends: 384 [2021-11-23 02:33:45,091 INFO L226 Difference]: Without dead ends: 219 [2021-11-23 02:33:45,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 589 SyntacticMatches, 0 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11520 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=10690, Invalid=39710, Unknown=0, NotChecked=0, Total=50400 [2021-11-23 02:33:45,094 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 5 mSDsluCounter, 731 mSDsCounter, 0 mSdLazyCounter, 1599 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 1609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:45,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 786 Invalid, 1609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1599 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:33:45,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-23 02:33:45,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2021-11-23 02:33:45,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 218 states have (on average 1.0091743119266054) internal successors, (220), 218 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:45,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2021-11-23 02:33:45,151 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 217 [2021-11-23 02:33:45,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:45,152 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2021-11-23 02:33:45,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 2.3132530120481927) internal successors, (384), 165 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:45,152 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2021-11-23 02:33:45,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-23 02:33:45,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:45,153 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 1, 1, 1, 1] [2021-11-23 02:33:45,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 02:33:45,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable106 [2021-11-23 02:33:45,354 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:45,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:45,354 INFO L85 PathProgramCache]: Analyzing trace with hash -1661148923, now seen corresponding path program 106 times [2021-11-23 02:33:45,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:45,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637238825] [2021-11-23 02:33:45,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:45,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:45,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:46,746 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1431 proven. 4294 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:46,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:46,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637238825] [2021-11-23 02:33:46,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637238825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:46,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568042930] [2021-11-23 02:33:46,747 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:33:46,747 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:46,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:46,748 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:46,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-23 02:33:46,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:46,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 838 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-23 02:33:46,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:47,355 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:47,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:47,785 INFO L134 CoverageAnalysis]: Checked inductivity of 5725 backedges. 1485 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:47,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568042930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:47,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [928388696] [2021-11-23 02:33:47,787 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:47,787 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:47,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:47,788 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:47,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:47,863 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:48,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134847#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:48,135 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:48,135 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:33:48,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 59 [2021-11-23 02:33:48,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644317375] [2021-11-23 02:33:48,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:33:48,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-23 02:33:48,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:48,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-23 02:33:48,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1625, Invalid=2535, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:33:48,137 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:49,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:49,570 INFO L93 Difference]: Finished difference Result 230 states and 231 transitions. [2021-11-23 02:33:49,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-11-23 02:33:49,571 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 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 218 [2021-11-23 02:33:49,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:49,571 INFO L225 Difference]: With dead ends: 230 [2021-11-23 02:33:49,571 INFO L226 Difference]: Without dead ends: 228 [2021-11-23 02:33:49,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 697 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3736 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=4932, Invalid=9588, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 02:33:49,573 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 171 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 220 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:49,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 26 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:33:49,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-23 02:33:49,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 222. [2021-11-23 02:33:49,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:49,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2021-11-23 02:33:49,619 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 218 [2021-11-23 02:33:49,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:49,619 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2021-11-23 02:33:49,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.7) internal successors, (222), 59 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:33:49,619 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2021-11-23 02:33:49,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-11-23 02:33:49,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:49,620 INFO L514 BasicCegarLoop]: trace histogram [55, 54, 54, 54, 1, 1, 1, 1] [2021-11-23 02:33:49,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:49,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:49,821 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:49,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:49,821 INFO L85 PathProgramCache]: Analyzing trace with hash -669560300, now seen corresponding path program 107 times [2021-11-23 02:33:49,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:49,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669070675] [2021-11-23 02:33:49,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:49,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:49,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:53,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4241 proven. 1645 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:53,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:53,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669070675] [2021-11-23 02:33:53,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669070675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:53,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219659565] [2021-11-23 02:33:53,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:33:53,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:53,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:53,467 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:53,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 02:33:53,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2021-11-23 02:33:53,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:33:53,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-23 02:33:53,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:58,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:58,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:59,337 INFO L134 CoverageAnalysis]: Checked inductivity of 5886 backedges. 4401 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:33:59,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219659565] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:33:59,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239322082] [2021-11-23 02:33:59,338 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:33:59,338 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:33:59,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:33:59,339 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:33:59,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:33:59,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:33:59,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '137236#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:33:59,999 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:33:59,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:00,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 168 [2021-11-23 02:34:00,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392643008] [2021-11-23 02:34:00,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:00,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2021-11-23 02:34:00,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:00,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2021-11-23 02:34:00,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6403, Invalid=23699, Unknown=0, NotChecked=0, Total=30102 [2021-11-23 02:34:00,003 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 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) [2021-11-23 02:34:03,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:03,073 INFO L93 Difference]: Finished difference Result 391 states and 393 transitions. [2021-11-23 02:34:03,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-23 02:34:03,073 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 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) Word has length 221 [2021-11-23 02:34:03,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:03,074 INFO L225 Difference]: With dead ends: 391 [2021-11-23 02:34:03,074 INFO L226 Difference]: Without dead ends: 223 [2021-11-23 02:34:03,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 600 SyntacticMatches, 0 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11926 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=11080, Invalid=41132, Unknown=0, NotChecked=0, Total=52212 [2021-11-23 02:34:03,077 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 5 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 1363 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 1372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:03,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 668 Invalid, 1372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1363 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:34:03,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-23 02:34:03,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2021-11-23 02:34:03,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 222 states have (on average 1.009009009009009) internal successors, (224), 222 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:03,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2021-11-23 02:34:03,124 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 221 [2021-11-23 02:34:03,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:03,125 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2021-11-23 02:34:03,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 2.3136094674556213) internal successors, (391), 168 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) [2021-11-23 02:34:03,125 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2021-11-23 02:34:03,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-11-23 02:34:03,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:03,126 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 1, 1, 1, 1] [2021-11-23 02:34:03,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-23 02:34:03,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable108 [2021-11-23 02:34:03,353 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:03,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:03,353 INFO L85 PathProgramCache]: Analyzing trace with hash -2013914097, now seen corresponding path program 108 times [2021-11-23 02:34:03,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:03,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163772999] [2021-11-23 02:34:03,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:03,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:03,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:04,811 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1485 proven. 4456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:04,811 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:04,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163772999] [2021-11-23 02:34:04,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163772999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:04,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81222430] [2021-11-23 02:34:04,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:34:04,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:04,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:04,813 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:04,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 02:34:04,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:34:04,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:04,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 113 conjunts are in the unsatisfiable core [2021-11-23 02:34:04,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:05,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:05,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:05,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5941 backedges. 1540 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:05,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81222430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:05,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875421709] [2021-11-23 02:34:05,861 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:05,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:05,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:05,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:05,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:05,938 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:06,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '139793#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:06,212 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:06,212 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:06,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 60 [2021-11-23 02:34:06,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112250071] [2021-11-23 02:34:06,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:06,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-23 02:34:06,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:06,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-23 02:34:06,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=2608, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:34:06,215 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:07,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:07,748 INFO L93 Difference]: Finished difference Result 234 states and 235 transitions. [2021-11-23 02:34:07,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-23 02:34:07,749 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 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 222 [2021-11-23 02:34:07,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:07,749 INFO L225 Difference]: With dead ends: 234 [2021-11-23 02:34:07,749 INFO L226 Difference]: Without dead ends: 232 [2021-11-23 02:34:07,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 710 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3860 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=5105, Invalid=9901, Unknown=0, NotChecked=0, Total=15006 [2021-11-23 02:34:07,750 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 120 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:07,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 22 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:34:07,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-23 02:34:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 226. [2021-11-23 02:34:07,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 225 states have (on average 1.008888888888889) internal successors, (227), 225 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) [2021-11-23 02:34:07,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2021-11-23 02:34:07,810 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2021-11-23 02:34:07,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:07,810 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2021-11-23 02:34:07,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.7049180327868854) internal successors, (226), 60 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:07,811 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2021-11-23 02:34:07,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-11-23 02:34:07,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:07,812 INFO L514 BasicCegarLoop]: trace histogram [56, 55, 55, 55, 1, 1, 1, 1] [2021-11-23 02:34:07,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:08,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable109 [2021-11-23 02:34:08,033 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:08,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:08,033 INFO L85 PathProgramCache]: Analyzing trace with hash -111885622, now seen corresponding path program 109 times [2021-11-23 02:34:08,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:08,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303760233] [2021-11-23 02:34:08,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:08,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:08,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:11,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4402 proven. 1703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:11,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:11,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303760233] [2021-11-23 02:34:11,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303760233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:11,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536958141] [2021-11-23 02:34:11,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:34:11,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:11,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:11,872 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:11,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-23 02:34:12,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:12,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-23 02:34:12,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:17,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:17,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6105 backedges. 4565 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:17,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536958141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:17,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [665394792] [2021-11-23 02:34:17,522 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:17,523 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:17,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:17,523 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:17,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:17,603 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:18,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '142225#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:18,176 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:18,176 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:18,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 171 [2021-11-23 02:34:18,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043649943] [2021-11-23 02:34:18,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:18,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-23 02:34:18,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:18,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-23 02:34:18,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6631, Invalid=24521, Unknown=0, NotChecked=0, Total=31152 [2021-11-23 02:34:18,179 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 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) [2021-11-23 02:34:20,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:20,844 INFO L93 Difference]: Finished difference Result 398 states and 400 transitions. [2021-11-23 02:34:20,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-23 02:34:20,844 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 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 225 [2021-11-23 02:34:20,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:20,845 INFO L225 Difference]: With dead ends: 398 [2021-11-23 02:34:20,845 INFO L226 Difference]: Without dead ends: 227 [2021-11-23 02:34:20,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 611 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12339 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=11477, Invalid=42579, Unknown=0, NotChecked=0, Total=54056 [2021-11-23 02:34:20,847 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 5 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 1204 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 1217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:20,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 583 Invalid, 1217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1204 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:34:20,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-23 02:34:20,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2021-11-23 02:34:20,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.008849557522124) internal successors, (228), 226 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:20,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2021-11-23 02:34:20,888 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 225 [2021-11-23 02:34:20,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:20,889 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2021-11-23 02:34:20,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 2.313953488372093) internal successors, (398), 171 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) [2021-11-23 02:34:20,889 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2021-11-23 02:34:20,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-23 02:34:20,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:20,890 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 1, 1, 1, 1] [2021-11-23 02:34:20,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:21,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:21,090 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:21,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:21,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1468524731, now seen corresponding path program 110 times [2021-11-23 02:34:21,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:21,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943260044] [2021-11-23 02:34:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:21,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:21,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:22,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1540 proven. 4621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:22,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:22,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943260044] [2021-11-23 02:34:22,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943260044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:22,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161119112] [2021-11-23 02:34:22,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:34:22,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:22,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:22,458 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:22,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 02:34:22,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2021-11-23 02:34:22,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:22,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 868 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-23 02:34:22,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:23,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:23,535 INFO L134 CoverageAnalysis]: Checked inductivity of 6161 backedges. 1596 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:23,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161119112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:23,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860414395] [2021-11-23 02:34:23,536 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:23,536 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:23,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:23,537 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:23,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:23,613 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:23,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '144828#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:23,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:23,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:23,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 61 [2021-11-23 02:34:23,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235528173] [2021-11-23 02:34:23,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:23,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-23 02:34:23,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:23,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-23 02:34:23,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=2682, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 02:34:23,881 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:25,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:25,236 INFO L93 Difference]: Finished difference Result 238 states and 239 transitions. [2021-11-23 02:34:25,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-11-23 02:34:25,237 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 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 [2021-11-23 02:34:25,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:25,237 INFO L225 Difference]: With dead ends: 238 [2021-11-23 02:34:25,237 INFO L226 Difference]: Without dead ends: 236 [2021-11-23 02:34:25,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 723 SyntacticMatches, 2 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3986 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5281, Invalid=10219, Unknown=0, NotChecked=0, Total=15500 [2021-11-23 02:34:25,239 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 122 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:25,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 18 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:25,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-23 02:34:25,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 230. [2021-11-23 02:34:25,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 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) [2021-11-23 02:34:25,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2021-11-23 02:34:25,299 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 226 [2021-11-23 02:34:25,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:25,300 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2021-11-23 02:34:25,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.7096774193548385) internal successors, (230), 61 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:25,300 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2021-11-23 02:34:25,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-23 02:34:25,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:25,301 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 56, 1, 1, 1, 1] [2021-11-23 02:34:25,325 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-23 02:34:25,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-11-23 02:34:25,501 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:25,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:25,502 INFO L85 PathProgramCache]: Analyzing trace with hash -278563884, now seen corresponding path program 111 times [2021-11-23 02:34:25,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:25,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996118072] [2021-11-23 02:34:25,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:25,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:25,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:29,062 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4566 proven. 1762 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:29,062 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:29,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996118072] [2021-11-23 02:34:29,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996118072] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:29,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56056006] [2021-11-23 02:34:29,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:34:29,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:29,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:29,064 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:29,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 02:34:29,226 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:34:29,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:29,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-23 02:34:29,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:34,100 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:34,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:34,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6328 backedges. 4732 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:34,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56056006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:34,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [971192019] [2021-11-23 02:34:34,516 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:34,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:34,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:34,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:34,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:34,579 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:35,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '147303#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:35,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:35,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:35,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 174 [2021-11-23 02:34:35,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586226453] [2021-11-23 02:34:35,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:35,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 175 states [2021-11-23 02:34:35,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:35,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2021-11-23 02:34:35,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6863, Invalid=25357, Unknown=0, NotChecked=0, Total=32220 [2021-11-23 02:34:35,128 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 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) [2021-11-23 02:34:37,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:37,870 INFO L93 Difference]: Finished difference Result 405 states and 407 transitions. [2021-11-23 02:34:37,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-23 02:34:37,871 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 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) Word has length 229 [2021-11-23 02:34:37,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:37,871 INFO L225 Difference]: With dead ends: 405 [2021-11-23 02:34:37,871 INFO L226 Difference]: Without dead ends: 231 [2021-11-23 02:34:37,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 622 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12759 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=11881, Invalid=44051, Unknown=0, NotChecked=0, Total=55932 [2021-11-23 02:34:37,875 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 5 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 1166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:37,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 561 Invalid, 1166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:34:37,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-23 02:34:37,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-23 02:34:37,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.008695652173913) internal successors, (232), 230 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:37,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 232 transitions. [2021-11-23 02:34:37,916 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 232 transitions. Word has length 229 [2021-11-23 02:34:37,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:37,916 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 232 transitions. [2021-11-23 02:34:37,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 175 states, 175 states have (on average 2.3142857142857145) internal successors, (405), 174 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) [2021-11-23 02:34:37,917 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 232 transitions. [2021-11-23 02:34:37,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-11-23 02:34:37,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:37,917 INFO L514 BasicCegarLoop]: trace histogram [57, 57, 56, 56, 1, 1, 1, 1] [2021-11-23 02:34:37,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 02:34:38,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-11-23 02:34:38,118 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:38,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:38,118 INFO L85 PathProgramCache]: Analyzing trace with hash -75230513, now seen corresponding path program 112 times [2021-11-23 02:34:38,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:38,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942686458] [2021-11-23 02:34:38,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:38,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:38,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:39,531 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1596 proven. 4789 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:39,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:39,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942686458] [2021-11-23 02:34:39,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942686458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:39,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806723567] [2021-11-23 02:34:39,532 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:34:39,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:39,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:39,532 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:39,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 02:34:39,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:39,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-23 02:34:39,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:40,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:40,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:40,497 INFO L134 CoverageAnalysis]: Checked inductivity of 6385 backedges. 1653 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:40,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806723567] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:40,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353613491] [2021-11-23 02:34:40,498 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:40,498 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:40,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:40,499 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:40,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:40,562 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:40,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149952#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:40,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:40,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:40,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 62 [2021-11-23 02:34:40,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744628021] [2021-11-23 02:34:40,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:40,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-23 02:34:40,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:40,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-23 02:34:40,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1799, Invalid=2757, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 02:34:40,808 INFO L87 Difference]: Start difference. First operand 231 states and 232 transitions. Second operand has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:42,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:42,105 INFO L93 Difference]: Finished difference Result 242 states and 243 transitions. [2021-11-23 02:34:42,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-11-23 02:34:42,106 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 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 230 [2021-11-23 02:34:42,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:42,106 INFO L225 Difference]: With dead ends: 242 [2021-11-23 02:34:42,106 INFO L226 Difference]: Without dead ends: 240 [2021-11-23 02:34:42,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 736 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4114 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=5460, Invalid=10542, Unknown=0, NotChecked=0, Total=16002 [2021-11-23 02:34:42,107 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 125 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:42,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 16 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:42,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-11-23 02:34:42,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 234. [2021-11-23 02:34:42,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.0085836909871244) internal successors, (235), 233 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:42,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 235 transitions. [2021-11-23 02:34:42,149 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 235 transitions. Word has length 230 [2021-11-23 02:34:42,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:42,149 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 235 transitions. [2021-11-23 02:34:42,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.7142857142857144) internal successors, (234), 62 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:42,150 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 235 transitions. [2021-11-23 02:34:42,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-11-23 02:34:42,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:42,150 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 1, 1, 1, 1] [2021-11-23 02:34:42,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:42,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2021-11-23 02:34:42,351 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:42,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:42,351 INFO L85 PathProgramCache]: Analyzing trace with hash 785536010, now seen corresponding path program 113 times [2021-11-23 02:34:42,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:42,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736842272] [2021-11-23 02:34:42,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:42,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:42,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:45,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4733 proven. 1822 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:45,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:45,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736842272] [2021-11-23 02:34:45,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736842272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:45,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326938404] [2021-11-23 02:34:45,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:34:45,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:45,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:45,919 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:45,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 02:34:46,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-23 02:34:46,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:46,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-23 02:34:46,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:51,054 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:51,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6555 backedges. 4902 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:51,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326938404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:51,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359477605] [2021-11-23 02:34:51,463 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:51,463 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:51,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:51,464 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:51,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:51,536 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:52,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152470#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:52,103 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:52,103 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:52,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 177 [2021-11-23 02:34:52,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952368431] [2021-11-23 02:34:52,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:52,104 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2021-11-23 02:34:52,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:52,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-11-23 02:34:52,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7099, Invalid=26207, Unknown=0, NotChecked=0, Total=33306 [2021-11-23 02:34:52,106 INFO L87 Difference]: Start difference. First operand 234 states and 235 transitions. Second operand has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:54,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:54,864 INFO L93 Difference]: Finished difference Result 412 states and 414 transitions. [2021-11-23 02:34:54,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-23 02:34:54,865 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 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 233 [2021-11-23 02:34:54,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:54,865 INFO L225 Difference]: With dead ends: 412 [2021-11-23 02:34:54,865 INFO L226 Difference]: Without dead ends: 235 [2021-11-23 02:34:54,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 633 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13186 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=12292, Invalid=45548, Unknown=0, NotChecked=0, Total=57840 [2021-11-23 02:34:54,870 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 5 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 1336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:54,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 650 Invalid, 1336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:34:54,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-11-23 02:34:54,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 235. [2021-11-23 02:34:54,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 234 states have (on average 1.0085470085470085) internal successors, (236), 234 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) [2021-11-23 02:34:54,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 236 transitions. [2021-11-23 02:34:54,930 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 236 transitions. Word has length 233 [2021-11-23 02:34:54,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:54,930 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 236 transitions. [2021-11-23 02:34:54,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 178 states, 178 states have (on average 2.3146067415730336) internal successors, (412), 177 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:34:54,930 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 236 transitions. [2021-11-23 02:34:54,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2021-11-23 02:34:54,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:54,931 INFO L514 BasicCegarLoop]: trace histogram [58, 58, 57, 57, 1, 1, 1, 1] [2021-11-23 02:34:54,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:55,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2021-11-23 02:34:55,132 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:55,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:55,132 INFO L85 PathProgramCache]: Analyzing trace with hash -1136460411, now seen corresponding path program 114 times [2021-11-23 02:34:55,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:55,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302148897] [2021-11-23 02:34:55,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:55,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:55,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:56,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1653 proven. 4960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:56,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:56,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302148897] [2021-11-23 02:34:56,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302148897] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:56,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679149285] [2021-11-23 02:34:56,485 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:34:56,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:56,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:56,485 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:56,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 02:34:56,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:34:56,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:56,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-23 02:34:56,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:57,048 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:57,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:57,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6613 backedges. 1711 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:57,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679149285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:57,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177990283] [2021-11-23 02:34:57,443 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:34:57,443 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:57,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:57,444 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:57,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:34:57,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:34:57,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155165#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:34:57,780 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:34:57,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:34:57,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 63 [2021-11-23 02:34:57,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352060914] [2021-11-23 02:34:57,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:34:57,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 02:34:57,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:57,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 02:34:57,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=2833, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 02:34:57,782 INFO L87 Difference]: Start difference. First operand 235 states and 236 transitions. Second operand has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 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) [2021-11-23 02:34:59,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:59,152 INFO L93 Difference]: Finished difference Result 246 states and 247 transitions. [2021-11-23 02:34:59,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-11-23 02:34:59,152 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 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 234 [2021-11-23 02:34:59,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:59,153 INFO L225 Difference]: With dead ends: 246 [2021-11-23 02:34:59,153 INFO L226 Difference]: Without dead ends: 244 [2021-11-23 02:34:59,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 749 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4244 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5642, Invalid=10870, Unknown=0, NotChecked=0, Total=16512 [2021-11-23 02:34:59,154 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 243 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 294 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 294 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:59,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 17 Invalid, 904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [294 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:59,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-23 02:34:59,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 238. [2021-11-23 02:34:59,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 1.0084388185654007) internal successors, (239), 237 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) [2021-11-23 02:34:59,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2021-11-23 02:34:59,197 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 234 [2021-11-23 02:34:59,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:59,198 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2021-11-23 02:34:59,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 3.71875) internal successors, (238), 63 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) [2021-11-23 02:34:59,198 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2021-11-23 02:34:59,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2021-11-23 02:34:59,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:59,199 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 58, 1, 1, 1, 1] [2021-11-23 02:34:59,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:59,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:59,399 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:59,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:59,399 INFO L85 PathProgramCache]: Analyzing trace with hash 939910548, now seen corresponding path program 115 times [2021-11-23 02:34:59,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:59,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279197621] [2021-11-23 02:34:59,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:59,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:59,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:03,070 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 4903 proven. 1883 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:03,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:03,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279197621] [2021-11-23 02:35:03,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279197621] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:03,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248732164] [2021-11-23 02:35:03,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:35:03,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:03,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:03,072 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:03,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 02:35:03,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:03,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-23 02:35:03,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:08,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:08,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:08,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6786 backedges. 5075 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:08,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248732164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:08,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1418766713] [2021-11-23 02:35:08,598 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:08,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:08,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:08,599 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:08,599 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:08,670 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:09,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '157726#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:09,229 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:09,229 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:09,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 180 [2021-11-23 02:35:09,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787352216] [2021-11-23 02:35:09,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:09,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2021-11-23 02:35:09,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:09,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2021-11-23 02:35:09,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7339, Invalid=27071, Unknown=0, NotChecked=0, Total=34410 [2021-11-23 02:35:09,232 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:12,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:12,116 INFO L93 Difference]: Finished difference Result 419 states and 421 transitions. [2021-11-23 02:35:12,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-23 02:35:12,116 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 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 237 [2021-11-23 02:35:12,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:12,117 INFO L225 Difference]: With dead ends: 419 [2021-11-23 02:35:12,117 INFO L226 Difference]: Without dead ends: 239 [2021-11-23 02:35:12,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 644 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13620 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=12710, Invalid=47070, Unknown=0, NotChecked=0, Total=59780 [2021-11-23 02:35:12,122 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 5 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 1464 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 1473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:12,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 722 Invalid, 1473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1464 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:35:12,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-23 02:35:12,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2021-11-23 02:35:12,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0084033613445378) internal successors, (240), 238 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:12,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2021-11-23 02:35:12,166 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 237 [2021-11-23 02:35:12,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:12,166 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2021-11-23 02:35:12,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 2.314917127071823) internal successors, (419), 180 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:12,166 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2021-11-23 02:35:12,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-23 02:35:12,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:12,167 INFO L514 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 1, 1, 1, 1] [2021-11-23 02:35:12,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:12,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable116 [2021-11-23 02:35:12,368 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:12,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:12,368 INFO L85 PathProgramCache]: Analyzing trace with hash -507553393, now seen corresponding path program 116 times [2021-11-23 02:35:12,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:12,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296996046] [2021-11-23 02:35:12,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:12,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:12,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:13,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1711 proven. 5134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:13,818 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:13,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296996046] [2021-11-23 02:35:13,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296996046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:13,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964464900] [2021-11-23 02:35:13,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:35:13,819 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:13,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:13,820 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:13,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 02:35:14,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2021-11-23 02:35:14,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:14,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-23 02:35:14,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:14,502 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:14,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:14,919 INFO L134 CoverageAnalysis]: Checked inductivity of 6845 backedges. 1770 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:14,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964464900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:14,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114628341] [2021-11-23 02:35:14,920 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:14,921 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:14,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:14,921 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:14,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:14,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:15,262 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '160467#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:15,262 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:15,262 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:15,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 64 [2021-11-23 02:35:15,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397606148] [2021-11-23 02:35:15,262 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:15,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 02:35:15,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:15,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 02:35:15,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1920, Invalid=2910, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 02:35:15,263 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:16,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:16,657 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2021-11-23 02:35:16,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-11-23 02:35:16,658 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 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 [2021-11-23 02:35:16,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:16,658 INFO L225 Difference]: With dead ends: 250 [2021-11-23 02:35:16,658 INFO L226 Difference]: Without dead ends: 248 [2021-11-23 02:35:16,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 893 GetRequests, 762 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4376 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5827, Invalid=11203, Unknown=0, NotChecked=0, Total=17030 [2021-11-23 02:35:16,659 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 248 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 299 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 299 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:16,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 21 Invalid, 927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [299 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:35:16,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-23 02:35:16,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2021-11-23 02:35:16,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 1.008298755186722) internal successors, (243), 241 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) [2021-11-23 02:35:16,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 243 transitions. [2021-11-23 02:35:16,704 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 243 transitions. Word has length 238 [2021-11-23 02:35:16,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:16,704 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 243 transitions. [2021-11-23 02:35:16,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.723076923076923) internal successors, (242), 64 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:16,704 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 243 transitions. [2021-11-23 02:35:16,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-11-23 02:35:16,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:16,705 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 1, 1, 1, 1] [2021-11-23 02:35:16,726 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-23 02:35:16,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable117 [2021-11-23 02:35:16,905 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:16,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:16,906 INFO L85 PathProgramCache]: Analyzing trace with hash 2061538634, now seen corresponding path program 117 times [2021-11-23 02:35:16,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:16,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951153018] [2021-11-23 02:35:16,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:16,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:20,710 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5076 proven. 1945 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:20,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:20,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951153018] [2021-11-23 02:35:20,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951153018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:20,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041070188] [2021-11-23 02:35:20,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:35:20,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:20,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:20,712 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:20,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-23 02:35:20,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:35:20,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:20,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 923 conjuncts, 122 conjunts are in the unsatisfiable core [2021-11-23 02:35:20,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:26,133 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:26,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:26,563 INFO L134 CoverageAnalysis]: Checked inductivity of 7021 backedges. 5251 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:26,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041070188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:26,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [699258013] [2021-11-23 02:35:26,564 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:26,564 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:26,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:26,565 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:26,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:26,632 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:27,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163071#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:27,205 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:27,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:27,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 183 [2021-11-23 02:35:27,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067060460] [2021-11-23 02:35:27,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:27,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2021-11-23 02:35:27,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:27,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2021-11-23 02:35:27,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7583, Invalid=27949, Unknown=0, NotChecked=0, Total=35532 [2021-11-23 02:35:27,209 INFO L87 Difference]: Start difference. First operand 242 states and 243 transitions. Second operand has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:30,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:30,145 INFO L93 Difference]: Finished difference Result 426 states and 428 transitions. [2021-11-23 02:35:30,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-23 02:35:30,145 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 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 241 [2021-11-23 02:35:30,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:30,147 INFO L225 Difference]: With dead ends: 426 [2021-11-23 02:35:30,147 INFO L226 Difference]: Without dead ends: 243 [2021-11-23 02:35:30,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 655 SyntacticMatches, 0 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14061 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=13135, Invalid=48617, Unknown=0, NotChecked=0, Total=61752 [2021-11-23 02:35:30,149 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 5 mSDsluCounter, 557 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 1271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:30,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 618 Invalid, 1271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:35:30,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-23 02:35:30,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-11-23 02:35:30,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.0082644628099173) internal successors, (244), 242 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:30,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 244 transitions. [2021-11-23 02:35:30,194 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 244 transitions. Word has length 241 [2021-11-23 02:35:30,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:30,195 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 244 transitions. [2021-11-23 02:35:30,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 2.3152173913043477) internal successors, (426), 183 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:30,195 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 244 transitions. [2021-11-23 02:35:30,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-23 02:35:30,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:30,196 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 59, 59, 1, 1, 1, 1] [2021-11-23 02:35:30,216 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2021-11-23 02:35:30,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:30,396 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:30,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:30,396 INFO L85 PathProgramCache]: Analyzing trace with hash 41522117, now seen corresponding path program 118 times [2021-11-23 02:35:30,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:30,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795434068] [2021-11-23 02:35:30,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:30,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:31,913 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1770 proven. 5311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:31,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:31,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795434068] [2021-11-23 02:35:31,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795434068] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:31,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086924877] [2021-11-23 02:35:31,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:35:31,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:31,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:31,914 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:31,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-23 02:35:32,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:32,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 928 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-23 02:35:32,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:32,473 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:32,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 7081 backedges. 1830 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:32,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086924877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:32,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295616961] [2021-11-23 02:35:32,920 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:32,921 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:32,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:32,921 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:32,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:32,988 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:33,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165858#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:33,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:33,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:33,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 65 [2021-11-23 02:35:33,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603332558] [2021-11-23 02:35:33,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:33,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-23 02:35:33,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:33,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-23 02:35:33,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1982, Invalid=2988, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 02:35:33,266 INFO L87 Difference]: Start difference. First operand 243 states and 244 transitions. Second operand has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:34,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:34,703 INFO L93 Difference]: Finished difference Result 254 states and 255 transitions. [2021-11-23 02:35:34,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-11-23 02:35:34,704 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 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 242 [2021-11-23 02:35:34,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:34,704 INFO L225 Difference]: With dead ends: 254 [2021-11-23 02:35:34,705 INFO L226 Difference]: Without dead ends: 252 [2021-11-23 02:35:34,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 775 SyntacticMatches, 2 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4510 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=6015, Invalid=11541, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 02:35:34,706 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 191 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:34,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 14 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:35:34,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-23 02:35:34,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 246. [2021-11-23 02:35:34,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.0081632653061225) internal successors, (247), 245 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:34,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 247 transitions. [2021-11-23 02:35:34,751 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 247 transitions. Word has length 242 [2021-11-23 02:35:34,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:34,752 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 247 transitions. [2021-11-23 02:35:34,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.727272727272727) internal successors, (246), 65 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:34,752 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 247 transitions. [2021-11-23 02:35:34,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-11-23 02:35:34,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:34,753 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 60, 1, 1, 1, 1] [2021-11-23 02:35:34,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2021-11-23 02:35:34,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:34,953 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:34,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:34,954 INFO L85 PathProgramCache]: Analyzing trace with hash 39626580, now seen corresponding path program 119 times [2021-11-23 02:35:34,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:34,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011803648] [2021-11-23 02:35:34,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:34,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:35,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:38,851 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5252 proven. 2008 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:38,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:38,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011803648] [2021-11-23 02:35:38,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011803648] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:38,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311295019] [2021-11-23 02:35:38,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:35:38,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:38,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:38,853 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:38,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 02:35:39,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2021-11-23 02:35:39,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:39,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-23 02:35:39,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:44,562 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:44,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:45,012 INFO L134 CoverageAnalysis]: Checked inductivity of 7260 backedges. 5430 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:45,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311295019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:45,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473416980] [2021-11-23 02:35:45,013 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:45,013 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:45,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:45,013 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:45,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:45,075 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:45,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '168505#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:45,622 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:45,622 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:45,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 186 [2021-11-23 02:35:45,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622994661] [2021-11-23 02:35:45,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:45,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2021-11-23 02:35:45,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:45,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2021-11-23 02:35:45,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7831, Invalid=28841, Unknown=0, NotChecked=0, Total=36672 [2021-11-23 02:35:45,626 INFO L87 Difference]: Start difference. First operand 246 states and 247 transitions. Second operand has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:48,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:48,847 INFO L93 Difference]: Finished difference Result 433 states and 435 transitions. [2021-11-23 02:35:48,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-23 02:35:48,848 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 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 245 [2021-11-23 02:35:48,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:48,848 INFO L225 Difference]: With dead ends: 433 [2021-11-23 02:35:48,848 INFO L226 Difference]: Without dead ends: 247 [2021-11-23 02:35:48,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 666 SyntacticMatches, 0 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14509 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=13567, Invalid=50189, Unknown=0, NotChecked=0, Total=63756 [2021-11-23 02:35:48,851 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 5 mSDsluCounter, 697 mSDsCounter, 0 mSdLazyCounter, 1550 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 1560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:48,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 759 Invalid, 1560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1550 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:35:48,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-23 02:35:48,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2021-11-23 02:35:48,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 1.008130081300813) internal successors, (248), 246 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:48,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2021-11-23 02:35:48,901 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 245 [2021-11-23 02:35:48,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:48,901 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2021-11-23 02:35:48,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 2.3155080213903743) internal successors, (433), 186 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:48,902 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2021-11-23 02:35:48,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-11-23 02:35:48,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:48,902 INFO L514 BasicCegarLoop]: trace histogram [61, 61, 60, 60, 1, 1, 1, 1] [2021-11-23 02:35:48,925 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-23 02:35:49,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable120 [2021-11-23 02:35:49,103 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:49,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:49,103 INFO L85 PathProgramCache]: Analyzing trace with hash 782415, now seen corresponding path program 120 times [2021-11-23 02:35:49,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:49,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901530314] [2021-11-23 02:35:49,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:49,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:49,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:50,648 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1830 proven. 5491 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:50,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:50,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901530314] [2021-11-23 02:35:50,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901530314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:50,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182027814] [2021-11-23 02:35:50,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:35:50,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:50,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:50,653 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:50,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-23 02:35:50,804 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:35:50,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:35:50,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 943 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-23 02:35:50,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:51,244 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:51,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:51,683 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 1891 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:51,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182027814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:35:51,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [751755584] [2021-11-23 02:35:51,684 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:35:51,684 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:35:51,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:35:51,685 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:35:51,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:51,746 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:35:52,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171338#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:35:52,004 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:35:52,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:35:52,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 66 [2021-11-23 02:35:52,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142241804] [2021-11-23 02:35:52,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:35:52,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 02:35:52,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:52,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 02:35:52,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=3067, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:35:52,006 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:53,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:53,513 INFO L93 Difference]: Finished difference Result 258 states and 259 transitions. [2021-11-23 02:35:53,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-11-23 02:35:53,513 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 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 246 [2021-11-23 02:35:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:53,514 INFO L225 Difference]: With dead ends: 258 [2021-11-23 02:35:53,514 INFO L226 Difference]: Without dead ends: 256 [2021-11-23 02:35:53,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 923 GetRequests, 788 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4646 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=6206, Invalid=11884, Unknown=0, NotChecked=0, Total=18090 [2021-11-23 02:35:53,515 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 254 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:53,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 21 Invalid, 904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:35:53,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-23 02:35:53,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 250. [2021-11-23 02:35:53,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.0080321285140563) internal successors, (251), 249 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) [2021-11-23 02:35:53,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 251 transitions. [2021-11-23 02:35:53,566 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 251 transitions. Word has length 246 [2021-11-23 02:35:53,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:53,566 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 251 transitions. [2021-11-23 02:35:53,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.7313432835820897) internal successors, (250), 66 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:35:53,566 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 251 transitions. [2021-11-23 02:35:53,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 02:35:53,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:53,567 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 1, 1, 1, 1] [2021-11-23 02:35:53,589 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-23 02:35:53,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:53,768 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:53,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:53,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1838909066, now seen corresponding path program 121 times [2021-11-23 02:35:53,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:53,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128877478] [2021-11-23 02:35:53,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:53,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:57,842 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5431 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:57,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:57,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128877478] [2021-11-23 02:35:57,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128877478] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:57,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021595159] [2021-11-23 02:35:57,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:35:57,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:57,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:57,843 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:57,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 02:35:57,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:57,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 953 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-23 02:35:57,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:03,542 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:03,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:03,980 INFO L134 CoverageAnalysis]: Checked inductivity of 7503 backedges. 5612 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:03,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021595159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:03,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28098209] [2021-11-23 02:36:03,981 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:03,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:03,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:03,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:03,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:04,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:04,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '174028#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:04,590 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:04,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:04,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 189 [2021-11-23 02:36:04,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535742098] [2021-11-23 02:36:04,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:04,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-11-23 02:36:04,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:04,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-11-23 02:36:04,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8083, Invalid=29747, Unknown=0, NotChecked=0, Total=37830 [2021-11-23 02:36:04,606 INFO L87 Difference]: Start difference. First operand 250 states and 251 transitions. Second operand has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:07,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:07,861 INFO L93 Difference]: Finished difference Result 440 states and 442 transitions. [2021-11-23 02:36:07,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-23 02:36:07,861 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 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 249 [2021-11-23 02:36:07,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:07,862 INFO L225 Difference]: With dead ends: 440 [2021-11-23 02:36:07,862 INFO L226 Difference]: Without dead ends: 251 [2021-11-23 02:36:07,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 677 SyntacticMatches, 0 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14964 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=14006, Invalid=51786, Unknown=0, NotChecked=0, Total=65792 [2021-11-23 02:36:07,865 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 5 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 1522 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 750 SdHoareTripleChecker+Invalid, 1532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:07,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 750 Invalid, 1532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1522 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:36:07,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-23 02:36:07,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-23 02:36:07,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.008) internal successors, (252), 250 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:07,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 252 transitions. [2021-11-23 02:36:07,932 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 252 transitions. Word has length 249 [2021-11-23 02:36:07,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:07,932 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 252 transitions. [2021-11-23 02:36:07,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 190 states have (on average 2.3157894736842106) internal successors, (440), 189 states have internal predecessors, (440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:07,933 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 252 transitions. [2021-11-23 02:36:07,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-23 02:36:07,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:07,933 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 1, 1, 1, 1] [2021-11-23 02:36:07,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2021-11-23 02:36:08,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2021-11-23 02:36:08,134 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:08,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:08,134 INFO L85 PathProgramCache]: Analyzing trace with hash 3660293, now seen corresponding path program 122 times [2021-11-23 02:36:08,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:08,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658573142] [2021-11-23 02:36:08,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:08,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:08,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:09,714 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1891 proven. 5674 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:09,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:09,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658573142] [2021-11-23 02:36:09,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658573142] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:09,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955677037] [2021-11-23 02:36:09,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:36:09,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:09,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:09,715 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:09,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-23 02:36:10,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-23 02:36:10,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:36:10,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-23 02:36:10,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:10,531 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:10,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:11,010 INFO L134 CoverageAnalysis]: Checked inductivity of 7565 backedges. 1953 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:11,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955677037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:11,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153726516] [2021-11-23 02:36:11,011 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:11,011 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:11,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:11,012 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:11,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:11,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:11,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176907#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:11,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:11,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:11,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 67 [2021-11-23 02:36:11,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497732040] [2021-11-23 02:36:11,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:11,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 02:36:11,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:11,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 02:36:11,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2109, Invalid=3147, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:36:11,372 INFO L87 Difference]: Start difference. First operand 251 states and 252 transitions. Second operand has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:12,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:12,915 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2021-11-23 02:36:12,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-11-23 02:36:12,916 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 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 [2021-11-23 02:36:12,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:12,916 INFO L225 Difference]: With dead ends: 262 [2021-11-23 02:36:12,916 INFO L226 Difference]: Without dead ends: 260 [2021-11-23 02:36:12,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 801 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4784 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6400, Invalid=12232, Unknown=0, NotChecked=0, Total=18632 [2021-11-23 02:36:12,918 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 196 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 253 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 873 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 253 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:12,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 15 Invalid, 873 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [253 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:36:12,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-23 02:36:12,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 254. [2021-11-23 02:36:12,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 253 states have (on average 1.007905138339921) internal successors, (255), 253 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) [2021-11-23 02:36:12,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 255 transitions. [2021-11-23 02:36:12,967 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 255 transitions. Word has length 250 [2021-11-23 02:36:12,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:12,968 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 255 transitions. [2021-11-23 02:36:12,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.735294117647059) internal successors, (254), 67 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:12,968 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 255 transitions. [2021-11-23 02:36:12,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-11-23 02:36:12,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:12,969 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 62, 1, 1, 1, 1] [2021-11-23 02:36:12,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:13,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2021-11-23 02:36:13,169 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:13,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:13,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1674426644, now seen corresponding path program 123 times [2021-11-23 02:36:13,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:13,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542617693] [2021-11-23 02:36:13,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:13,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:13,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:17,389 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5613 proven. 2137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:17,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:17,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542617693] [2021-11-23 02:36:17,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542617693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:17,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371923930] [2021-11-23 02:36:17,389 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:36:17,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:17,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:17,390 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:17,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-23 02:36:17,543 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:36:17,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:36:17,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-23 02:36:17,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:23,247 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:23,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:23,727 INFO L134 CoverageAnalysis]: Checked inductivity of 7750 backedges. 5797 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:23,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371923930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:23,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [889484847] [2021-11-23 02:36:23,728 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:23,728 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:23,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:23,729 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:23,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:23,791 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:24,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179640#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:24,354 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:24,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:24,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 192 [2021-11-23 02:36:24,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8223988] [2021-11-23 02:36:24,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:24,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-23 02:36:24,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:24,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-23 02:36:24,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8339, Invalid=30667, Unknown=0, NotChecked=0, Total=39006 [2021-11-23 02:36:24,359 INFO L87 Difference]: Start difference. First operand 254 states and 255 transitions. Second operand has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:27,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:27,649 INFO L93 Difference]: Finished difference Result 447 states and 449 transitions. [2021-11-23 02:36:27,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-23 02:36:27,649 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 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 253 [2021-11-23 02:36:27,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:27,650 INFO L225 Difference]: With dead ends: 447 [2021-11-23 02:36:27,650 INFO L226 Difference]: Without dead ends: 255 [2021-11-23 02:36:27,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 688 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15426 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=14452, Invalid=53408, Unknown=0, NotChecked=0, Total=67860 [2021-11-23 02:36:27,653 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 5 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 1486 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 1495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:27,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 726 Invalid, 1495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1486 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:36:27,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-23 02:36:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2021-11-23 02:36:27,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.0078740157480315) internal successors, (256), 254 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) [2021-11-23 02:36:27,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 256 transitions. [2021-11-23 02:36:27,703 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 256 transitions. Word has length 253 [2021-11-23 02:36:27,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:27,703 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 256 transitions. [2021-11-23 02:36:27,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.316062176165803) internal successors, (447), 192 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:27,703 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 256 transitions. [2021-11-23 02:36:27,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-23 02:36:27,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:27,704 INFO L514 BasicCegarLoop]: trace histogram [63, 63, 62, 62, 1, 1, 1, 1] [2021-11-23 02:36:27,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:27,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable124 [2021-11-23 02:36:27,905 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:27,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:27,905 INFO L85 PathProgramCache]: Analyzing trace with hash -523380977, now seen corresponding path program 124 times [2021-11-23 02:36:27,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:27,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443084126] [2021-11-23 02:36:27,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:27,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:27,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 1953 proven. 5860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:29,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:29,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443084126] [2021-11-23 02:36:29,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443084126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:29,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340793472] [2021-11-23 02:36:29,505 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:36:29,505 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:29,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:29,505 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:29,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-23 02:36:29,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:29,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-23 02:36:29,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:30,095 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:30,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:30,551 INFO L134 CoverageAnalysis]: Checked inductivity of 7813 backedges. 2016 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:30,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340793472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:30,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910636814] [2021-11-23 02:36:30,552 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:30,552 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:30,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:30,553 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:30,553 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:30,606 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:30,889 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182565#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:30,889 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:30,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:30,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 68 [2021-11-23 02:36:30,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675684277] [2021-11-23 02:36:30,890 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:30,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-23 02:36:30,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:30,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-23 02:36:30,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2174, Invalid=3228, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 02:36:30,891 INFO L87 Difference]: Start difference. First operand 255 states and 256 transitions. Second operand has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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) [2021-11-23 02:36:32,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:32,420 INFO L93 Difference]: Finished difference Result 266 states and 267 transitions. [2021-11-23 02:36:32,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-11-23 02:36:32,421 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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 254 [2021-11-23 02:36:32,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:32,421 INFO L225 Difference]: With dead ends: 266 [2021-11-23 02:36:32,421 INFO L226 Difference]: Without dead ends: 264 [2021-11-23 02:36:32,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 953 GetRequests, 814 SyntacticMatches, 2 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4924 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6597, Invalid=12585, Unknown=0, NotChecked=0, Total=19182 [2021-11-23 02:36:32,423 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 136 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:32,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 18 Invalid, 866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 672 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:36:32,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-23 02:36:32,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 258. [2021-11-23 02:36:32,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 257 states have (on average 1.0077821011673151) internal successors, (259), 257 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:32,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 259 transitions. [2021-11-23 02:36:32,473 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 259 transitions. Word has length 254 [2021-11-23 02:36:32,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:32,474 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 259 transitions. [2021-11-23 02:36:32,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.739130434782609) internal successors, (258), 68 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) [2021-11-23 02:36:32,474 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 259 transitions. [2021-11-23 02:36:32,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-23 02:36:32,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:32,475 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 1, 1, 1, 1] [2021-11-23 02:36:32,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:32,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-11-23 02:36:32,675 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:32,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:32,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1306581046, now seen corresponding path program 125 times [2021-11-23 02:36:32,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:32,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784786787] [2021-11-23 02:36:32,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:32,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:32,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:37,008 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5798 proven. 2203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:37,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:37,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784786787] [2021-11-23 02:36:37,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784786787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:37,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600616828] [2021-11-23 02:36:37,009 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:36:37,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:37,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:37,010 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:37,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-23 02:36:37,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-23 02:36:37,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:36:37,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 983 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-23 02:36:37,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:43,207 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:43,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:43,701 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 5985 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:43,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600616828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:43,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1730095169] [2021-11-23 02:36:43,702 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:43,702 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:43,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:43,703 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:43,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:43,792 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:44,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185341#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:44,356 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:44,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:44,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 195 [2021-11-23 02:36:44,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636780244] [2021-11-23 02:36:44,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:44,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2021-11-23 02:36:44,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:44,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2021-11-23 02:36:44,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8599, Invalid=31601, Unknown=0, NotChecked=0, Total=40200 [2021-11-23 02:36:44,360 INFO L87 Difference]: Start difference. First operand 258 states and 259 transitions. Second operand has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:47,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:47,636 INFO L93 Difference]: Finished difference Result 454 states and 456 transitions. [2021-11-23 02:36:47,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-23 02:36:47,637 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 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 257 [2021-11-23 02:36:47,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:47,637 INFO L225 Difference]: With dead ends: 454 [2021-11-23 02:36:47,637 INFO L226 Difference]: Without dead ends: 259 [2021-11-23 02:36:47,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 699 SyntacticMatches, 0 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15895 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=14905, Invalid=55055, Unknown=0, NotChecked=0, Total=69960 [2021-11-23 02:36:47,640 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 5 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 1413 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 688 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:47,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 688 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1413 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:36:47,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-23 02:36:47,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-11-23 02:36:47,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 1.0077519379844961) internal successors, (260), 258 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:47,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2021-11-23 02:36:47,691 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 257 [2021-11-23 02:36:47,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:47,691 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2021-11-23 02:36:47,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 2.316326530612245) internal successors, (454), 195 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:47,692 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2021-11-23 02:36:47,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-23 02:36:47,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:47,693 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 1, 1, 1, 1] [2021-11-23 02:36:47,714 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Ended with exit code 0 [2021-11-23 02:36:47,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:47,897 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:47,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:47,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1436143685, now seen corresponding path program 126 times [2021-11-23 02:36:47,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:47,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861910633] [2021-11-23 02:36:47,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:47,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:47,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:49,548 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2016 proven. 6049 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:49,548 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:49,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861910633] [2021-11-23 02:36:49,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861910633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:49,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391563679] [2021-11-23 02:36:49,548 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:36:49,549 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:49,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:49,550 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:49,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 02:36:49,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:36:49,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:36:49,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-23 02:36:49,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:50,168 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:50,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:36:50,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8065 backedges. 2080 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:50,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391563679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:36:50,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [468698720] [2021-11-23 02:36:50,632 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:36:50,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:36:50,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:36:50,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:36:50,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:36:50,694 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:36:50,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '188312#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:36:50,956 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:36:50,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:36:50,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 69 [2021-11-23 02:36:50,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139047432] [2021-11-23 02:36:50,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:36:50,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-23 02:36:50,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:50,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-23 02:36:50,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2240, Invalid=3310, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 02:36:50,959 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:52,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:52,547 INFO L93 Difference]: Finished difference Result 270 states and 271 transitions. [2021-11-23 02:36:52,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-11-23 02:36:52,548 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 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 258 [2021-11-23 02:36:52,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:52,549 INFO L225 Difference]: With dead ends: 270 [2021-11-23 02:36:52,549 INFO L226 Difference]: Without dead ends: 268 [2021-11-23 02:36:52,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 827 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5066 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=6797, Invalid=12943, Unknown=0, NotChecked=0, Total=19740 [2021-11-23 02:36:52,551 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 267 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:52,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [267 Valid, 21 Invalid, 972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:36:52,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-23 02:36:52,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 262. [2021-11-23 02:36:52,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 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) [2021-11-23 02:36:52,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2021-11-23 02:36:52,604 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2021-11-23 02:36:52,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:52,605 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2021-11-23 02:36:52,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 3.742857142857143) internal successors, (262), 69 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:36:52,605 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2021-11-23 02:36:52,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-11-23 02:36:52,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:52,606 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 64, 1, 1, 1, 1] [2021-11-23 02:36:52,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2021-11-23 02:36:52,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable127 [2021-11-23 02:36:52,808 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:52,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:52,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1992104660, now seen corresponding path program 127 times [2021-11-23 02:36:52,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:52,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186666359] [2021-11-23 02:36:52,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:52,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:52,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:57,309 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 5986 proven. 2270 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:36:57,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:57,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186666359] [2021-11-23 02:36:57,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186666359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:57,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104147446] [2021-11-23 02:36:57,310 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:36:57,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:57,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:57,312 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:57,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-23 02:36:57,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:57,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-23 02:36:57,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:03,482 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:37:03,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:37:03,946 INFO L134 CoverageAnalysis]: Checked inductivity of 8256 backedges. 6176 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:37:03,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104147446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:37:03,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140783376] [2021-11-23 02:37:03,948 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:37:03,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:37:03,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:37:03,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:37:03,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:37:04,009 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:37:04,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191131#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:37:04,582 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:37:04,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:37:04,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [131, 131, 131] total 198 [2021-11-23 02:37:04,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977317210] [2021-11-23 02:37:04,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:37:04,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2021-11-23 02:37:04,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:04,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2021-11-23 02:37:04,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8863, Invalid=32549, Unknown=0, NotChecked=0, Total=41412 [2021-11-23 02:37:04,587 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:08,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:08,171 INFO L93 Difference]: Finished difference Result 461 states and 463 transitions. [2021-11-23 02:37:08,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-23 02:37:08,171 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 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 261 [2021-11-23 02:37:08,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:08,172 INFO L225 Difference]: With dead ends: 461 [2021-11-23 02:37:08,172 INFO L226 Difference]: Without dead ends: 263 [2021-11-23 02:37:08,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 710 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16371 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=15365, Invalid=56727, Unknown=0, NotChecked=0, Total=72092 [2021-11-23 02:37:08,175 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 5 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 1905 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 938 SdHoareTripleChecker+Invalid, 1912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:08,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 938 Invalid, 1912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1905 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:37:08,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-23 02:37:08,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2021-11-23 02:37:08,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0076335877862594) internal successors, (264), 262 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:08,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 264 transitions. [2021-11-23 02:37:08,228 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 264 transitions. Word has length 261 [2021-11-23 02:37:08,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:08,228 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 264 transitions. [2021-11-23 02:37:08,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 2.3165829145728645) internal successors, (461), 198 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:08,229 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 264 transitions. [2021-11-23 02:37:08,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:37:08,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:08,229 INFO L514 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 1, 1, 1, 1] [2021-11-23 02:37:08,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:08,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable128 [2021-11-23 02:37:08,433 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:08,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:08,433 INFO L85 PathProgramCache]: Analyzing trace with hash 325651919, now seen corresponding path program 128 times [2021-11-23 02:37:08,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:08,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202282957] [2021-11-23 02:37:08,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:08,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:08,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:37:10,208 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2080 proven. 6241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:37:10,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:37:10,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202282957] [2021-11-23 02:37:10,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202282957] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:37:10,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807928342] [2021-11-23 02:37:10,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:37:10,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:37:10,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:37:10,209 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:37:10,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2021-11-23 02:37:10,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2021-11-23 02:37:10,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:37:10,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-23 02:37:10,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:37:11,009 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:37:11,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:37:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 8321 backedges. 2145 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:37:11,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807928342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:37:11,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [852346846] [2021-11-23 02:37:11,504 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:37:11,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:37:11,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:37:11,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:37:11,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:37:11,581 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:37:11,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '194148#(and (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:37:11,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:37:11,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:37:11,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 70 [2021-11-23 02:37:11,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917184250] [2021-11-23 02:37:11,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:37:11,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 02:37:11,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:37:11,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 02:37:11,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2307, Invalid=3393, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 02:37:11,882 INFO L87 Difference]: Start difference. First operand 263 states and 264 transitions. Second operand has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:13,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:37:13,488 INFO L93 Difference]: Finished difference Result 274 states and 275 transitions. [2021-11-23 02:37:13,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-23 02:37:13,489 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 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 [2021-11-23 02:37:13,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:37:13,490 INFO L225 Difference]: With dead ends: 274 [2021-11-23 02:37:13,490 INFO L226 Difference]: Without dead ends: 272 [2021-11-23 02:37:13,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 840 SyntacticMatches, 2 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5210 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=7000, Invalid=13306, Unknown=0, NotChecked=0, Total=20306 [2021-11-23 02:37:13,492 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 205 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:37:13,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 19 Invalid, 920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 655 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:37:13,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-11-23 02:37:13,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 266. [2021-11-23 02:37:13,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:13,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2021-11-23 02:37:13,548 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 262 [2021-11-23 02:37:13,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:37:13,549 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2021-11-23 02:37:13,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.7464788732394365) internal successors, (266), 70 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:37:13,549 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2021-11-23 02:37:13,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-23 02:37:13,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:37:13,550 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 1, 1, 1, 1] [2021-11-23 02:37:13,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Forceful destruction successful, exit code 0 [2021-11-23 02:37:13,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b20a0ff1-64ac-49c5-84ba-61b7cdc41475/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-11-23 02:37:13,750 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:37:13,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:37:13,751 INFO L85 PathProgramCache]: Analyzing trace with hash -829982454, now seen corresponding path program 129 times [2021-11-23 02:37:13,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:37:13,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68214988] [2021-11-23 02:37:13,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:37:13,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:37:13,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat