./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 03:43:59,616 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:43:59,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:43:59,660 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:43:59,661 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:43:59,665 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:43:59,667 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:43:59,671 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:43:59,675 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:43:59,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:43:59,677 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:43:59,678 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:43:59,678 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:43:59,679 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:43:59,680 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:43:59,681 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:43:59,682 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:43:59,683 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:43:59,684 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:43:59,686 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:43:59,689 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:43:59,694 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:43:59,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:43:59,698 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:43:59,711 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:43:59,712 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:43:59,712 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:43:59,713 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:43:59,713 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:43:59,714 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:43:59,714 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:43:59,715 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:43:59,716 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:43:59,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:43:59,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:43:59,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:43:59,718 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:43:59,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:43:59,725 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:43:59,726 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:43:59,726 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:43:59,727 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 03:43:59,771 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:43:59,771 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:43:59,772 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:43:59,772 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:43:59,773 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:43:59,773 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:43:59,773 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:43:59,774 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:43:59,774 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:43:59,774 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:43:59,775 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:43:59,775 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:43:59,776 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:43:59,776 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:43:59,776 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:43:59,776 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:43:59,777 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:43:59,777 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:43:59,777 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:43:59,778 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:43:59,778 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:43:59,778 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:43:59,778 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:43:59,780 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 03:43:59,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:43:59,780 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 03:43:59,781 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:43:59,781 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 03:43:59,781 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:43:59,781 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 03:43:59,781 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:43:59,782 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:43:59,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:43:59,782 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:43:59,783 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:43:59,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:43:59,783 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 03:43:59,783 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:43:59,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:43:59,784 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 03:43:59,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:43:59,784 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2022-11-03 03:44:00,092 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:44:00,124 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:44:00,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:44:00,128 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:44:00,128 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:44:00,130 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-03 03:44:00,192 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/data/388fbeebd/325abc898f5d4150ac1dbec64c8622f9/FLAG901442e3b [2022-11-03 03:44:00,667 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:44:00,668 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-03 03:44:00,678 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/data/388fbeebd/325abc898f5d4150ac1dbec64c8622f9/FLAG901442e3b [2022-11-03 03:44:01,033 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/data/388fbeebd/325abc898f5d4150ac1dbec64c8622f9 [2022-11-03 03:44:01,035 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:44:01,037 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:44:01,043 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:01,044 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:44:01,047 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:44:01,049 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,051 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f91fdfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01, skipping insertion in model container [2022-11-03 03:44:01,051 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,059 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:44:01,077 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:44:01,247 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_0c72e946-dbec-4e27-97b9-91880e639b64/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-03 03:44:01,258 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:01,266 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:44:01,278 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_0c72e946-dbec-4e27-97b9-91880e639b64/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-03 03:44:01,283 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:44:01,296 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:44:01,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01 WrapperNode [2022-11-03 03:44:01,297 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:44:01,298 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:44:01,298 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:44:01,298 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:44:01,306 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,315 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,332 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2022-11-03 03:44:01,332 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:44:01,333 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:44:01,333 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:44:01,333 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:44:01,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,343 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,344 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,350 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,351 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,352 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:44:01,354 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:44:01,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:44:01,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:44:01,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (1/1) ... [2022-11-03 03:44:01,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:44:01,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:01,387 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:44:01,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:44:01,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 03:44:01,431 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 03:44:01,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:44:01,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:44:01,491 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:44:01,493 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:44:01,686 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:44:01,758 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:44:01,758 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 03:44:01,760 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:44:01 BoogieIcfgContainer [2022-11-03 03:44:01,761 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:44:01,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:44:01,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:44:01,777 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:44:01,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:44:01" (1/3) ... [2022-11-03 03:44:01,778 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ecb0b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:44:01, skipping insertion in model container [2022-11-03 03:44:01,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:44:01" (2/3) ... [2022-11-03 03:44:01,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ecb0b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:44:01, skipping insertion in model container [2022-11-03 03:44:01,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:44:01" (3/3) ... [2022-11-03 03:44:01,780 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2022-11-03 03:44:01,813 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:44:01,813 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 03:44:01,894 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:44:01,901 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@17af491c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:44:01,902 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 03:44:01,906 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:01,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 03:44:01,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:01,913 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:01,914 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:01,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:01,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2022-11-03 03:44:01,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:01,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910506880] [2022-11-03 03:44:01,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:01,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:02,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:02,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:02,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:02,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910506880] [2022-11-03 03:44:02,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910506880] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:02,120 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:02,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:44:02,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820215236] [2022-11-03 03:44:02,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:02,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 03:44:02,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:02,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 03:44:02,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 03:44:02,173 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:02,220 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-11-03 03:44:02,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 03:44:02,225 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-03 03:44:02,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:02,234 INFO L225 Difference]: With dead ends: 27 [2022-11-03 03:44:02,235 INFO L226 Difference]: Without dead ends: 13 [2022-11-03 03:44:02,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 03:44:02,246 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:02,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:02,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-03 03:44:02,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-03 03:44:02,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-03 03:44:02,283 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-11-03 03:44:02,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:02,283 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-03 03:44:02,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,285 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-03 03:44:02,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 03:44:02,286 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:02,286 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:02,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 03:44:02,287 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:02,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:02,291 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2022-11-03 03:44:02,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:02,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164841995] [2022-11-03 03:44:02,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:02,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:02,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:02,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:02,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164841995] [2022-11-03 03:44:02,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164841995] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:02,585 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:02,586 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:44:02,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523974962] [2022-11-03 03:44:02,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:02,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:44:02,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:02,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:44:02,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:44:02,589 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:02,702 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2022-11-03 03:44:02,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:44:02,703 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 03:44:02,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:02,704 INFO L225 Difference]: With dead ends: 18 [2022-11-03 03:44:02,704 INFO L226 Difference]: Without dead ends: 16 [2022-11-03 03:44:02,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:02,710 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:02,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 21 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:02,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-03 03:44:02,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-11-03 03:44:02,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-11-03 03:44:02,724 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2022-11-03 03:44:02,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:02,724 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-11-03 03:44:02,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,725 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-11-03 03:44:02,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 03:44:02,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:02,725 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:02,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 03:44:02,726 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:02,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:02,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2022-11-03 03:44:02,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:02,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052909959] [2022-11-03 03:44:02,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:02,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:02,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:02,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:02,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:02,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052909959] [2022-11-03 03:44:02,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052909959] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:44:02,923 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:44:02,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 03:44:02,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930932766] [2022-11-03 03:44:02,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:44:02,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:44:02,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:02,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:44:02,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:44:02,925 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:02,971 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-11-03 03:44:02,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:44:02,972 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 03:44:02,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:02,973 INFO L225 Difference]: With dead ends: 31 [2022-11-03 03:44:02,973 INFO L226 Difference]: Without dead ends: 20 [2022-11-03 03:44:02,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:44:02,974 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:02,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:44:02,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-03 03:44:02,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2022-11-03 03:44:02,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-03 03:44:02,982 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2022-11-03 03:44:02,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:02,982 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-03 03:44:02,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:02,983 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-03 03:44:02,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 03:44:02,983 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:02,983 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:02,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 03:44:02,984 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:02,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:02,985 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2022-11-03 03:44:02,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:02,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423136815] [2022-11-03 03:44:02,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:02,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:03,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:03,107 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:03,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:03,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423136815] [2022-11-03 03:44:03,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423136815] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:03,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254257627] [2022-11-03 03:44:03,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:03,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:03,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:03,111 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:03,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 03:44:03,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:03,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:44:03,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:03,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:03,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:03,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254257627] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:03,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614698775] [2022-11-03 03:44:03,378 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:03,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:03,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:03,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:03,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:03,859 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:04,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:04,364 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:04,364 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:04,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2022-11-03 03:44:04,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312117311] [2022-11-03 03:44:04,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:04,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:44:04,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:04,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:44:04,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:44:04,367 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:04,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:04,597 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-11-03 03:44:04,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 03:44:04,597 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 03:44:04,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:04,598 INFO L225 Difference]: With dead ends: 41 [2022-11-03 03:44:04,598 INFO L226 Difference]: Without dead ends: 30 [2022-11-03 03:44:04,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2022-11-03 03:44:04,600 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:04,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 41 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:04,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-03 03:44:04,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2022-11-03 03:44:04,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:04,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-03 03:44:04,606 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2022-11-03 03:44:04,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:04,606 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-03 03:44:04,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:04,607 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-03 03:44:04,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 03:44:04,607 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:04,607 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:04,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:04,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:04,831 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:04,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:04,832 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2022-11-03 03:44:04,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:04,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192469450] [2022-11-03 03:44:04,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:04,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:04,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:04,976 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:04,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:04,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192469450] [2022-11-03 03:44:04,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192469450] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:04,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364225053] [2022-11-03 03:44:04,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:04,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:04,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:04,978 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:05,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 03:44:05,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:44:05,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:05,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 03:44:05,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:05,157 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:05,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:05,251 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:05,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364225053] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:05,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1580748321] [2022-11-03 03:44:05,264 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:05,264 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:05,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:05,265 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:05,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:05,473 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:05,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '551#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:05,882 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:05,882 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:05,883 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 12 [2022-11-03 03:44:05,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651082967] [2022-11-03 03:44:05,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:05,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:44:05,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:05,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:44:05,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:44:05,884 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:06,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:06,144 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2022-11-03 03:44:06,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 03:44:06,144 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 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) Word has length 22 [2022-11-03 03:44:06,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:06,146 INFO L225 Difference]: With dead ends: 56 [2022-11-03 03:44:06,147 INFO L226 Difference]: Without dead ends: 41 [2022-11-03 03:44:06,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=172, Invalid=884, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 03:44:06,148 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 40 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:06,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 50 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:06,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-03 03:44:06,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2022-11-03 03:44:06,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:06,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-03 03:44:06,156 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2022-11-03 03:44:06,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:06,156 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-03 03:44:06,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 12 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:06,157 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-03 03:44:06,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-03 03:44:06,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:06,158 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:06,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:06,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:06,371 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:06,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:06,372 INFO L85 PathProgramCache]: Analyzing trace with hash -1367196232, now seen corresponding path program 3 times [2022-11-03 03:44:06,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:06,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990772239] [2022-11-03 03:44:06,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:06,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:06,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:06,554 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:06,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:06,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990772239] [2022-11-03 03:44:06,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990772239] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:06,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425643234] [2022-11-03 03:44:06,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:06,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:06,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:06,557 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:06,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 03:44:06,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:06,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:06,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 03:44:06,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:06,738 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:06,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:06,883 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:06,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425643234] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:06,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [26521594] [2022-11-03 03:44:06,888 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:06,888 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:06,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:06,889 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:06,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:07,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:07,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '884#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:07,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:07,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:07,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 15 [2022-11-03 03:44:07,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951910595] [2022-11-03 03:44:07,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:07,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 03:44:07,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:07,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 03:44:07,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-11-03 03:44:07,490 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:07,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:07,870 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2022-11-03 03:44:07,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 03:44:07,871 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-03 03:44:07,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:07,872 INFO L225 Difference]: With dead ends: 69 [2022-11-03 03:44:07,872 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 03:44:07,873 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 67 SyntacticMatches, 7 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 03:44:07,874 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 58 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:07,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 62 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:07,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 03:44:07,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2022-11-03 03:44:07,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:07,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-03 03:44:07,880 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2022-11-03 03:44:07,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:07,881 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-03 03:44:07,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:07,881 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-03 03:44:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 03:44:07,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:07,882 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:07,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:08,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 03:44:08,087 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:08,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:08,087 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 4 times [2022-11-03 03:44:08,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:08,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303436369] [2022-11-03 03:44:08,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:08,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:08,259 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:08,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:08,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303436369] [2022-11-03 03:44:08,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303436369] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:08,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605583052] [2022-11-03 03:44:08,265 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:08,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:08,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:08,267 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:08,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 03:44:08,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:08,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:44:08,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:08,527 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:08,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:08,672 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:08,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605583052] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:08,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149834249] [2022-11-03 03:44:08,675 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:08,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:08,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:08,676 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:08,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:08,805 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:09,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1294#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:09,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:09,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:09,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-03 03:44:09,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582134759] [2022-11-03 03:44:09,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:09,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 03:44:09,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:09,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 03:44:09,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2022-11-03 03:44:09,238 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:09,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:09,428 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-11-03 03:44:09,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:44:09,428 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 03:44:09,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:09,429 INFO L225 Difference]: With dead ends: 75 [2022-11-03 03:44:09,429 INFO L226 Difference]: Without dead ends: 52 [2022-11-03 03:44:09,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 03:44:09,430 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:09,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 105 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:09,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-03 03:44:09,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2022-11-03 03:44:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:09,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-03 03:44:09,444 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2022-11-03 03:44:09,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:09,445 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-03 03:44:09,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:09,447 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-03 03:44:09,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 03:44:09,448 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:09,449 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:09,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:09,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-03 03:44:09,649 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:09,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:09,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 5 times [2022-11-03 03:44:09,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:09,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726393158] [2022-11-03 03:44:09,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:09,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:09,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:09,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:09,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726393158] [2022-11-03 03:44:09,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726393158] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:09,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598351737] [2022-11-03 03:44:09,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:09,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:09,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:09,817 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:09,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 03:44:09,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:44:09,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:09,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:44:09,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:09,963 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:09,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:10,094 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:10,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598351737] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:10,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [722086261] [2022-11-03 03:44:10,098 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:10,098 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:10,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:10,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:10,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:10,260 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:10,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1694#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:10,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:10,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:10,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2022-11-03 03:44:10,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525016901] [2022-11-03 03:44:10,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:10,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:44:10,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:10,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:44:10,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:44:10,596 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:10,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:10,750 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2022-11-03 03:44:10,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 03:44:10,751 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-03 03:44:10,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:10,751 INFO L225 Difference]: With dead ends: 54 [2022-11-03 03:44:10,751 INFO L226 Difference]: Without dead ends: 52 [2022-11-03 03:44:10,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 90 SyntacticMatches, 9 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2022-11-03 03:44:10,753 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 38 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:10,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 73 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:10,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-03 03:44:10,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2022-11-03 03:44:10,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:10,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-11-03 03:44:10,761 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2022-11-03 03:44:10,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:10,761 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-11-03 03:44:10,761 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:10,761 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-11-03 03:44:10,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-03 03:44:10,762 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:10,762 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:10,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:10,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 03:44:10,987 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:10,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:10,988 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 6 times [2022-11-03 03:44:10,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:10,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098058777] [2022-11-03 03:44:10,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:10,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:11,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:11,306 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:11,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:11,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098058777] [2022-11-03 03:44:11,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098058777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:11,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132347169] [2022-11-03 03:44:11,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:11,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:11,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:11,309 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:11,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 03:44:11,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:11,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:11,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:44:11,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:11,627 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:11,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:11,807 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:11,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1132347169] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:11,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27048289] [2022-11-03 03:44:11,809 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:11,810 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:11,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:11,810 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:11,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:11,995 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:12,397 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2145#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:12,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:12,398 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:12,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2022-11-03 03:44:12,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020535467] [2022-11-03 03:44:12,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:12,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 03:44:12,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:12,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 03:44:12,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:44:12,401 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:12,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:12,754 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2022-11-03 03:44:12,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 03:44:12,754 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-03 03:44:12,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:12,755 INFO L225 Difference]: With dead ends: 124 [2022-11-03 03:44:12,755 INFO L226 Difference]: Without dead ends: 70 [2022-11-03 03:44:12,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 103 SyntacticMatches, 9 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=422, Invalid=1834, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 03:44:12,757 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 83 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:12,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 123 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:12,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-03 03:44:12,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2022-11-03 03:44:12,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:12,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-03 03:44:12,767 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2022-11-03 03:44:12,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:12,768 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-03 03:44:12,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:12,768 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-03 03:44:12,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 03:44:12,775 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:12,775 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:12,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:12,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:12,991 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:12,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:12,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 7 times [2022-11-03 03:44:12,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:12,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821679568] [2022-11-03 03:44:12,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:12,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:13,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:13,204 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:13,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:13,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821679568] [2022-11-03 03:44:13,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821679568] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:13,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767619533] [2022-11-03 03:44:13,205 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:13,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:13,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:13,206 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:13,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 03:44:13,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:13,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:44:13,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:13,360 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:13,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:13,505 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:13,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767619533] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:13,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387707215] [2022-11-03 03:44:13,508 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:13,508 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:13,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:13,509 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:13,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:13,658 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:14,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2725#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:14,000 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:14,000 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:14,000 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2022-11-03 03:44:14,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853437419] [2022-11-03 03:44:14,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:14,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 03:44:14,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:14,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 03:44:14,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:44:14,002 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:14,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:14,219 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2022-11-03 03:44:14,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 03:44:14,220 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-03 03:44:14,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:14,221 INFO L225 Difference]: With dead ends: 66 [2022-11-03 03:44:14,221 INFO L226 Difference]: Without dead ends: 64 [2022-11-03 03:44:14,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 124 SyntacticMatches, 13 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=242, Invalid=814, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 03:44:14,222 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 54 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:14,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 103 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:14,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-03 03:44:14,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2022-11-03 03:44:14,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:14,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-11-03 03:44:14,231 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2022-11-03 03:44:14,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:14,231 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-11-03 03:44:14,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:14,231 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-11-03 03:44:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-03 03:44:14,232 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:14,232 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:14,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:14,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:14,443 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:14,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:14,444 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 8 times [2022-11-03 03:44:14,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:14,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335455727] [2022-11-03 03:44:14,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:14,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:14,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:14,816 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:14,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:14,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335455727] [2022-11-03 03:44:14,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335455727] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:14,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271811470] [2022-11-03 03:44:14,817 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:14,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:14,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:14,819 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:14,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:44:14,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-03 03:44:14,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:14,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:44:14,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:15,218 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:15,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:15,454 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:15,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271811470] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:15,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1261268598] [2022-11-03 03:44:15,457 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:15,457 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:15,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:15,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:15,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:15,617 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:16,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3294#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:16,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:16,060 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:16,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2022-11-03 03:44:16,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004454479] [2022-11-03 03:44:16,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:16,061 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 03:44:16,061 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:16,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 03:44:16,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1350, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 03:44:16,063 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:16,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:16,517 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2022-11-03 03:44:16,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 03:44:16,518 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-03 03:44:16,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:16,518 INFO L225 Difference]: With dead ends: 158 [2022-11-03 03:44:16,519 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:44:16,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 13 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1111 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 03:44:16,520 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 94 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:16,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 171 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:16,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:44:16,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2022-11-03 03:44:16,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:16,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-11-03 03:44:16,530 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2022-11-03 03:44:16,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:16,530 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-11-03 03:44:16,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:16,531 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-11-03 03:44:16,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 03:44:16,531 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:16,531 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:16,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:16,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 03:44:16,751 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:16,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:16,751 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 9 times [2022-11-03 03:44:16,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:16,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674275200] [2022-11-03 03:44:16,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:16,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:16,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:17,055 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:17,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:17,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674275200] [2022-11-03 03:44:17,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674275200] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:17,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565696816] [2022-11-03 03:44:17,056 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:17,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:17,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:17,057 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:17,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 03:44:17,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:17,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:17,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 03:44:17,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:17,243 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:17,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:17,455 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:17,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565696816] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:17,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734107297] [2022-11-03 03:44:17,457 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:17,457 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:17,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:17,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:17,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:17,566 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:17,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4024#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:17,928 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:17,928 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:17,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2022-11-03 03:44:17,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662127795] [2022-11-03 03:44:17,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:17,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 03:44:17,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:17,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 03:44:17,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-11-03 03:44:17,931 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:18,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:18,153 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2022-11-03 03:44:18,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 03:44:18,154 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-03 03:44:18,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:18,154 INFO L225 Difference]: With dead ends: 78 [2022-11-03 03:44:18,155 INFO L226 Difference]: Without dead ends: 76 [2022-11-03 03:44:18,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 158 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=315, Invalid=1017, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:44:18,156 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 55 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:18,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 111 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:18,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-03 03:44:18,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2022-11-03 03:44:18,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:18,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-03 03:44:18,166 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2022-11-03 03:44:18,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:18,166 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-03 03:44:18,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:18,167 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-03 03:44:18,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-03 03:44:18,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:18,167 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:18,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:18,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 03:44:18,395 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:18,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:18,395 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 10 times [2022-11-03 03:44:18,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:18,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196317147] [2022-11-03 03:44:18,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:18,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:18,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:18,832 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:18,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:18,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196317147] [2022-11-03 03:44:18,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196317147] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:18,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313746251] [2022-11-03 03:44:18,833 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:18,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:18,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:18,835 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:18,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:44:18,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:18,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:44:18,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:19,317 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:44:19,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:19,589 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:44:19,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313746251] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:19,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143757844] [2022-11-03 03:44:19,591 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:19,591 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:19,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:19,592 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:19,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:19,713 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:20,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4708#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:20,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:20,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:20,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2022-11-03 03:44:20,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220142508] [2022-11-03 03:44:20,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:20,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 03:44:20,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:20,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 03:44:20,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 03:44:20,178 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:20,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:20,518 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2022-11-03 03:44:20,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 03:44:20,518 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-03 03:44:20,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:20,519 INFO L225 Difference]: With dead ends: 146 [2022-11-03 03:44:20,519 INFO L226 Difference]: Without dead ends: 101 [2022-11-03 03:44:20,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 03:44:20,521 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 68 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:20,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 219 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:20,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-03 03:44:20,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2022-11-03 03:44:20,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:20,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-11-03 03:44:20,542 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2022-11-03 03:44:20,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:20,543 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-11-03 03:44:20,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:20,543 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-11-03 03:44:20,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-03 03:44:20,544 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:20,544 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:20,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:20,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:20,767 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:20,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:20,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 11 times [2022-11-03 03:44:20,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:20,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573272958] [2022-11-03 03:44:20,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:20,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:20,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:21,236 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:21,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:21,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573272958] [2022-11-03 03:44:21,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573272958] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:21,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534733726] [2022-11-03 03:44:21,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:21,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:21,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:21,239 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:21,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:44:21,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-03 03:44:21,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:21,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:44:21,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:21,625 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:21,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:22,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534733726] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:22,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [22415717] [2022-11-03 03:44:22,085 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:22,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:22,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:22,086 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:22,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:22,215 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:22,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5501#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:22,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:22,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:22,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 36 [2022-11-03 03:44:22,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022957818] [2022-11-03 03:44:22,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:22,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-03 03:44:22,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:22,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-03 03:44:22,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 03:44:22,666 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:23,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:23,740 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2022-11-03 03:44:23,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-03 03:44:23,740 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-11-03 03:44:23,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:23,741 INFO L225 Difference]: With dead ends: 160 [2022-11-03 03:44:23,742 INFO L226 Difference]: Without dead ends: 113 [2022-11-03 03:44:23,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 179 SyntacticMatches, 21 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2946 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1184, Invalid=6648, Unknown=0, NotChecked=0, Total=7832 [2022-11-03 03:44:23,744 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 188 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:23,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 166 Invalid, 751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:44:23,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-03 03:44:23,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2022-11-03 03:44:23,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:23,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-11-03 03:44:23,757 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 70 [2022-11-03 03:44:23,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:23,757 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-11-03 03:44:23,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:23,758 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-11-03 03:44:23,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-03 03:44:23,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:23,759 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:23,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:23,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 03:44:23,987 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:23,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:23,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1928614536, now seen corresponding path program 12 times [2022-11-03 03:44:23,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:23,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365230313] [2022-11-03 03:44:23,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:23,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:24,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:24,518 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:24,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:24,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365230313] [2022-11-03 03:44:24,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365230313] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:24,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923386432] [2022-11-03 03:44:24,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:24,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:24,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:24,520 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:24,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 03:44:24,599 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:24,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:24,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 03:44:24,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:24,974 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:24,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:25,477 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:25,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923386432] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:25,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656131996] [2022-11-03 03:44:25,479 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:25,479 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:25,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:25,479 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:25,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:25,601 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:26,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6442#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:26,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:26,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:26,106 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2022-11-03 03:44:26,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059609966] [2022-11-03 03:44:26,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:26,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-03 03:44:26,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:26,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-03 03:44:26,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1937, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 03:44:26,109 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:27,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:27,274 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2022-11-03 03:44:27,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-03 03:44:27,275 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-11-03 03:44:27,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:27,275 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:44:27,276 INFO L226 Difference]: Without dead ends: 122 [2022-11-03 03:44:27,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 195 SyntacticMatches, 23 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3485 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1378, Invalid=7742, Unknown=0, NotChecked=0, Total=9120 [2022-11-03 03:44:27,279 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 176 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:27,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 186 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:44:27,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-03 03:44:27,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 83. [2022-11-03 03:44:27,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:27,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-11-03 03:44:27,289 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 76 [2022-11-03 03:44:27,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:27,290 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-11-03 03:44:27,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:27,290 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-11-03 03:44:27,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-03 03:44:27,291 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:27,291 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:27,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:27,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 03:44:27,503 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:27,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:27,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 13 times [2022-11-03 03:44:27,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:27,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079597313] [2022-11-03 03:44:27,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:27,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:27,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:28,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:28,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079597313] [2022-11-03 03:44:28,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079597313] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:28,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332290381] [2022-11-03 03:44:28,170 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:28,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:28,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:28,173 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:28,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 03:44:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:28,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:44:28,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:28,807 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:28,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:29,203 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:29,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332290381] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:29,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142697684] [2022-11-03 03:44:29,204 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:29,205 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:29,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:29,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:29,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:29,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:29,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7460#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:29,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:29,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:29,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-03 03:44:29,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316983195] [2022-11-03 03:44:29,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:29,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-03 03:44:29,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:29,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-03 03:44:29,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 03:44:29,829 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:30,265 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2022-11-03 03:44:30,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 03:44:30,265 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-11-03 03:44:30,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:30,266 INFO L225 Difference]: With dead ends: 179 [2022-11-03 03:44:30,266 INFO L226 Difference]: Without dead ends: 124 [2022-11-03 03:44:30,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 03:44:30,269 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 84 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:30,269 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 268 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:30,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-03 03:44:30,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2022-11-03 03:44:30,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-11-03 03:44:30,279 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2022-11-03 03:44:30,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:30,279 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-11-03 03:44:30,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:30,280 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-11-03 03:44:30,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-03 03:44:30,281 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:30,281 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:30,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:30,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 03:44:30,487 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:30,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:30,488 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 14 times [2022-11-03 03:44:30,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:30,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918119391] [2022-11-03 03:44:30,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:30,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:30,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:30,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:30,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918119391] [2022-11-03 03:44:30,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918119391] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:30,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57764320] [2022-11-03 03:44:30,963 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:30,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:30,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:30,964 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:30,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 03:44:31,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-03 03:44:31,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:31,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 03:44:31,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:31,191 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:31,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:31,510 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:31,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57764320] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:31,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387758458] [2022-11-03 03:44:31,512 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:31,512 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:31,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:31,513 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:31,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:31,632 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:32,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8396#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:32,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:32,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:32,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2022-11-03 03:44:32,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229325070] [2022-11-03 03:44:32,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:32,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 03:44:32,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:32,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 03:44:32,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2022-11-03 03:44:32,011 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:32,306 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2022-11-03 03:44:32,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-03 03:44:32,307 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-11-03 03:44:32,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:32,308 INFO L225 Difference]: With dead ends: 102 [2022-11-03 03:44:32,308 INFO L226 Difference]: Without dead ends: 100 [2022-11-03 03:44:32,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 226 SyntacticMatches, 25 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 797 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=497, Invalid=1483, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 03:44:32,309 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 70 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:32,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 147 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:32,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-03 03:44:32,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-11-03 03:44:32,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-11-03 03:44:32,320 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2022-11-03 03:44:32,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:32,321 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-11-03 03:44:32,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:32,321 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-11-03 03:44:32,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-03 03:44:32,322 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:32,322 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:32,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:32,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:32,527 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:32,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:32,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 15 times [2022-11-03 03:44:32,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:32,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132112374] [2022-11-03 03:44:32,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:32,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:32,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:33,260 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:33,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132112374] [2022-11-03 03:44:33,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132112374] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:33,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353320474] [2022-11-03 03:44:33,260 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:33,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:33,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:33,263 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:33,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 03:44:33,356 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:33,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:33,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-03 03:44:33,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:33,994 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:33,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:34,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353320474] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:34,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1048708936] [2022-11-03 03:44:34,437 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:34,437 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:34,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:34,438 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:34,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:34,552 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:35,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9319#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:35,078 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:35,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:35,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 50 [2022-11-03 03:44:35,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309888517] [2022-11-03 03:44:35,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:35,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 03:44:35,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:35,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 03:44:35,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=2784, Unknown=0, NotChecked=0, Total=3422 [2022-11-03 03:44:35,081 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:35,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:35,849 INFO L93 Difference]: Finished difference Result 260 states and 279 transitions. [2022-11-03 03:44:35,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-03 03:44:35,850 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-03 03:44:35,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:35,851 INFO L225 Difference]: With dead ends: 260 [2022-11-03 03:44:35,851 INFO L226 Difference]: Without dead ends: 142 [2022-11-03 03:44:35,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 223 SyntacticMatches, 25 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2626 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1582, Invalid=6074, Unknown=0, NotChecked=0, Total=7656 [2022-11-03 03:44:35,853 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 160 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:35,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 350 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:44:35,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-03 03:44:35,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2022-11-03 03:44:35,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:35,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-11-03 03:44:35,865 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2022-11-03 03:44:35,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:35,866 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-11-03 03:44:35,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:35,866 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-11-03 03:44:35,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-03 03:44:35,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:35,867 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:35,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:36,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 03:44:36,068 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:36,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:36,068 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 16 times [2022-11-03 03:44:36,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:36,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826784146] [2022-11-03 03:44:36,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:36,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:36,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:36,646 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:36,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:36,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826784146] [2022-11-03 03:44:36,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826784146] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:36,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652460692] [2022-11-03 03:44:36,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:36,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:36,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:36,648 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:36,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 03:44:36,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:36,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-03 03:44:36,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:36,895 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:36,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:37,231 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:37,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652460692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:37,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16684719] [2022-11-03 03:44:37,233 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:37,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:37,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:37,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:37,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:37,355 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:37,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10499#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:37,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:37,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:37,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2022-11-03 03:44:37,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513734010] [2022-11-03 03:44:37,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:37,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 03:44:37,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:37,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 03:44:37,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=707, Unknown=0, NotChecked=0, Total=930 [2022-11-03 03:44:37,742 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:38,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:38,122 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2022-11-03 03:44:38,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 03:44:38,123 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-11-03 03:44:38,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:38,124 INFO L225 Difference]: With dead ends: 114 [2022-11-03 03:44:38,124 INFO L226 Difference]: Without dead ends: 112 [2022-11-03 03:44:38,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 260 SyntacticMatches, 29 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=606, Invalid=1746, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 03:44:38,125 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 95 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:38,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 166 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:44:38,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-03 03:44:38,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2022-11-03 03:44:38,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:38,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-11-03 03:44:38,139 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2022-11-03 03:44:38,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:38,139 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-11-03 03:44:38,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:38,140 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-11-03 03:44:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-03 03:44:38,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:38,143 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:38,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:38,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:38,373 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:38,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:38,374 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 17 times [2022-11-03 03:44:38,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:38,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142716115] [2022-11-03 03:44:38,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:38,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:38,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:39,183 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:39,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:39,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142716115] [2022-11-03 03:44:39,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142716115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:39,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785501057] [2022-11-03 03:44:39,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:39,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:39,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:39,185 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:39,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 03:44:39,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-03 03:44:39,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:39,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-03 03:44:39,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:40,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:40,544 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:40,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785501057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:40,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327690184] [2022-11-03 03:44:40,545 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:40,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:40,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:40,546 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:40,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:40,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:41,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11540#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:41,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:41,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:41,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 56 [2022-11-03 03:44:41,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050773684] [2022-11-03 03:44:41,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:41,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 03:44:41,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:41,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 03:44:41,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 03:44:41,248 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:42,150 INFO L93 Difference]: Finished difference Result 294 states and 315 transitions. [2022-11-03 03:44:42,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-03 03:44:42,151 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-11-03 03:44:42,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:42,151 INFO L225 Difference]: With dead ends: 294 [2022-11-03 03:44:42,151 INFO L226 Difference]: Without dead ends: 160 [2022-11-03 03:44:42,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 253 SyntacticMatches, 29 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3267 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1992, Invalid=7514, Unknown=0, NotChecked=0, Total=9506 [2022-11-03 03:44:42,153 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 188 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:42,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 411 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:44:42,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-03 03:44:42,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2022-11-03 03:44:42,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-11-03 03:44:42,165 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2022-11-03 03:44:42,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:42,165 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-11-03 03:44:42,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:42,165 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-11-03 03:44:42,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-03 03:44:42,166 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:42,166 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:42,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:42,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:42,367 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:42,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:42,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 18 times [2022-11-03 03:44:42,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:42,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481647271] [2022-11-03 03:44:42,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:42,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:42,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:42,994 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:42,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:42,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481647271] [2022-11-03 03:44:42,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481647271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:42,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636306756] [2022-11-03 03:44:42,995 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:42,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:42,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:42,999 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:43,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 03:44:43,097 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:43,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:43,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 03:44:43,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:43,288 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:43,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:43,754 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:43,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636306756] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:43,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [857264913] [2022-11-03 03:44:43,756 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:43,756 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:43,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:43,757 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:43,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:43,860 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:44,237 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12870#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:44,237 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:44,237 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:44,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2022-11-03 03:44:44,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625129196] [2022-11-03 03:44:44,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:44,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 03:44:44,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:44,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 03:44:44,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=794, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 03:44:44,239 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:44,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:44,659 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2022-11-03 03:44:44,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-03 03:44:44,660 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2022-11-03 03:44:44,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:44,661 INFO L225 Difference]: With dead ends: 126 [2022-11-03 03:44:44,661 INFO L226 Difference]: Without dead ends: 124 [2022-11-03 03:44:44,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 294 SyntacticMatches, 33 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=727, Invalid=2029, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 03:44:44,662 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 87 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:44,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 164 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:44:44,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-03 03:44:44,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2022-11-03 03:44:44,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:44,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2022-11-03 03:44:44,677 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2022-11-03 03:44:44,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:44,677 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2022-11-03 03:44:44,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:44,678 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2022-11-03 03:44:44,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-03 03:44:44,679 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:44,679 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:44,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:44,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 03:44:44,899 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:44,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:44,899 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 19 times [2022-11-03 03:44:44,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:44,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238008445] [2022-11-03 03:44:44,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:44,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:44,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:45,934 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:45,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:45,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238008445] [2022-11-03 03:44:45,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238008445] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:45,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140326366] [2022-11-03 03:44:45,935 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:44:45,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:45,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:45,936 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:45,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 03:44:46,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:46,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 03:44:46,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:46,917 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:44:46,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:47,504 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:44:47,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140326366] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:47,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [987124610] [2022-11-03 03:44:47,506 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:47,506 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:47,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:47,506 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:47,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:47,614 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:48,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14026#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:48,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:48,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:48,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2022-11-03 03:44:48,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539254790] [2022-11-03 03:44:48,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:48,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-03 03:44:48,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:48,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-03 03:44:48,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2022-11-03 03:44:48,198 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:48,858 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2022-11-03 03:44:48,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 03:44:48,858 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2022-11-03 03:44:48,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:48,859 INFO L225 Difference]: With dead ends: 250 [2022-11-03 03:44:48,859 INFO L226 Difference]: Without dead ends: 173 [2022-11-03 03:44:48,860 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 285 SyntacticMatches, 34 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2829 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2022-11-03 03:44:48,861 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 167 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:48,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 433 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:44:48,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-03 03:44:48,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2022-11-03 03:44:48,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2022-11-03 03:44:48,876 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2022-11-03 03:44:48,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:48,877 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2022-11-03 03:44:48,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:44:48,877 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2022-11-03 03:44:48,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-03 03:44:48,878 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:48,878 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:48,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:49,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-03 03:44:49,079 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:49,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:49,079 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 20 times [2022-11-03 03:44:49,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:49,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509035161] [2022-11-03 03:44:49,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:49,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:49,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:50,109 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:50,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:50,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509035161] [2022-11-03 03:44:50,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509035161] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:50,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947867889] [2022-11-03 03:44:50,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:44:50,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:50,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:50,111 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:50,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 03:44:50,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-03 03:44:50,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:50,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-03 03:44:50,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:50,953 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 342 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:50,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:52,024 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 342 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:52,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947867889] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:52,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430714354] [2022-11-03 03:44:52,026 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:52,026 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:52,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:52,027 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:52,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:52,153 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:52,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15371#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:52,739 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:52,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:52,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 21, 21] total 60 [2022-11-03 03:44:52,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158049318] [2022-11-03 03:44:52,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:52,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-03 03:44:52,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:52,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-03 03:44:52,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=4009, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 03:44:52,742 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 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) [2022-11-03 03:44:54,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:44:54,794 INFO L93 Difference]: Finished difference Result 264 states and 287 transitions. [2022-11-03 03:44:54,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-11-03 03:44:54,795 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 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) Word has length 118 [2022-11-03 03:44:54,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:44:54,796 INFO L225 Difference]: With dead ends: 264 [2022-11-03 03:44:54,796 INFO L226 Difference]: Without dead ends: 185 [2022-11-03 03:44:54,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 307 SyntacticMatches, 37 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8518 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3156, Invalid=17724, Unknown=0, NotChecked=0, Total=20880 [2022-11-03 03:44:54,799 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 296 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 1121 mSolverCounterSat, 294 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 1415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 294 IncrementalHoareTripleChecker+Valid, 1121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:44:54,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 313 Invalid, 1415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [294 Valid, 1121 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:44:54,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-11-03 03:44:54,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 125. [2022-11-03 03:44:54,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 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) [2022-11-03 03:44:54,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2022-11-03 03:44:54,816 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 118 [2022-11-03 03:44:54,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:44:54,816 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2022-11-03 03:44:54,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.9166666666666665) internal successors, (235), 60 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) [2022-11-03 03:44:54,817 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2022-11-03 03:44:54,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 03:44:54,818 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:44:54,818 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:44:54,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 03:44:55,031 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-03 03:44:55,031 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:44:55,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:44:55,031 INFO L85 PathProgramCache]: Analyzing trace with hash 1021193528, now seen corresponding path program 21 times [2022-11-03 03:44:55,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:44:55,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720936479] [2022-11-03 03:44:55,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:44:55,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:44:55,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:44:56,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 668 proven. 434 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:56,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:44:56,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720936479] [2022-11-03 03:44:56,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720936479] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:44:56,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055185255] [2022-11-03 03:44:56,194 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:44:56,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:44:56,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:44:56,196 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:44:56,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 03:44:56,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:44:56,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:44:56,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 03:44:56,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:44:57,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 380 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:57,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:44:58,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 380 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:44:58,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1055185255] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:44:58,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170585062] [2022-11-03 03:44:58,162 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:44:58,163 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:44:58,163 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:44:58,163 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:44:58,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:44:58,278 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:44:58,883 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16920#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:44:58,883 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:44:58,883 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:44:58,883 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 22, 22] total 63 [2022-11-03 03:44:58,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986759982] [2022-11-03 03:44:58,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:44:58,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-03 03:44:58,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:44:58,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-03 03:44:58,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=4365, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 03:44:58,886 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 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) [2022-11-03 03:45:01,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:01,148 INFO L93 Difference]: Finished difference Result 277 states and 301 transitions. [2022-11-03 03:45:01,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-03 03:45:01,149 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 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) Word has length 124 [2022-11-03 03:45:01,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:01,149 INFO L225 Difference]: With dead ends: 277 [2022-11-03 03:45:01,149 INFO L226 Difference]: Without dead ends: 194 [2022-11-03 03:45:01,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 323 SyntacticMatches, 39 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9417 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3470, Invalid=19482, Unknown=0, NotChecked=0, Total=22952 [2022-11-03 03:45:01,151 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 342 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 1228 mSolverCounterSat, 327 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 1555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 327 IncrementalHoareTripleChecker+Valid, 1228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:01,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [342 Valid, 337 Invalid, 1555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [327 Valid, 1228 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:45:01,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-11-03 03:45:01,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2022-11-03 03:45:01,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:01,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2022-11-03 03:45:01,169 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 124 [2022-11-03 03:45:01,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:01,170 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2022-11-03 03:45:01,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.9206349206349205) internal successors, (247), 63 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) [2022-11-03 03:45:01,170 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2022-11-03 03:45:01,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-03 03:45:01,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:01,171 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:01,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:01,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:01,375 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:01,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:01,375 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 22 times [2022-11-03 03:45:01,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:01,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557265610] [2022-11-03 03:45:01,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:01,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:01,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:02,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:02,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:02,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557265610] [2022-11-03 03:45:02,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557265610] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:02,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440850270] [2022-11-03 03:45:02,539 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:45:02,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:02,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:02,542 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:02,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 03:45:02,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:02,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 03:45:02,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:03,756 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:03,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:04,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:04,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440850270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:04,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511009590] [2022-11-03 03:45:04,528 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:04,528 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:04,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:04,528 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:04,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:04,634 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:05,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18546#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:05,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:05,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:05,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-11-03 03:45:05,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703636698] [2022-11-03 03:45:05,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:05,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-03 03:45:05,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:05,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-03 03:45:05,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2022-11-03 03:45:05,249 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:06,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:06,051 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2022-11-03 03:45:06,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-03 03:45:06,051 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-11-03 03:45:06,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:06,053 INFO L225 Difference]: With dead ends: 283 [2022-11-03 03:45:06,053 INFO L226 Difference]: Without dead ends: 196 [2022-11-03 03:45:06,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 318 SyntacticMatches, 40 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3586 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2022-11-03 03:45:06,055 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 163 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 686 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:06,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 512 Invalid, 686 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:45:06,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-03 03:45:06,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2022-11-03 03:45:06,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:06,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2022-11-03 03:45:06,075 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2022-11-03 03:45:06,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:06,075 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2022-11-03 03:45:06,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:06,076 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2022-11-03 03:45:06,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-03 03:45:06,077 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:06,077 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:06,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:06,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-03 03:45:06,290 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:06,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:06,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 23 times [2022-11-03 03:45:06,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:06,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812376692] [2022-11-03 03:45:06,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:06,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:06,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:07,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:07,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:07,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812376692] [2022-11-03 03:45:07,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812376692] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:07,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866091534] [2022-11-03 03:45:07,183 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:07,183 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:07,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:07,184 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:07,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 03:45:07,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-03 03:45:07,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:07,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-03 03:45:07,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:07,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:07,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:08,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:08,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866091534] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:08,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455504517] [2022-11-03 03:45:08,100 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:08,100 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:08,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:08,100 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:08,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:08,197 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:08,612 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:08,613 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:08,613 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:08,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2022-11-03 03:45:08,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667867255] [2022-11-03 03:45:08,613 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:08,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 03:45:08,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:08,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 03:45:08,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:45:08,614 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:09,086 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2022-11-03 03:45:09,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-03 03:45:09,086 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2022-11-03 03:45:09,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:09,087 INFO L225 Difference]: With dead ends: 150 [2022-11-03 03:45:09,088 INFO L226 Difference]: Without dead ends: 148 [2022-11-03 03:45:09,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 362 SyntacticMatches, 41 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1589 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1005, Invalid=2655, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 03:45:09,089 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 170 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:09,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 194 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:45:09,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-03 03:45:09,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-11-03 03:45:09,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2022-11-03 03:45:09,109 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2022-11-03 03:45:09,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:09,110 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2022-11-03 03:45:09,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:09,110 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2022-11-03 03:45:09,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-11-03 03:45:09,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:09,112 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:09,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:09,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 03:45:09,323 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:09,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:09,323 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 24 times [2022-11-03 03:45:09,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:09,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119519775] [2022-11-03 03:45:09,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:09,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:09,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:10,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:10,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:10,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119519775] [2022-11-03 03:45:10,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119519775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:10,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220188283] [2022-11-03 03:45:10,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:45:10,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:10,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:10,677 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:10,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 03:45:10,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:45:10,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:10,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 03:45:10,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:12,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 968 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:12,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:12,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 968 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:12,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220188283] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:12,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [244106272] [2022-11-03 03:45:12,867 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:12,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:12,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:12,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:12,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:12,970 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:13,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21413#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:13,622 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:13,622 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:13,622 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 74 [2022-11-03 03:45:13,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103095749] [2022-11-03 03:45:13,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:13,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-03 03:45:13,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:13,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-03 03:45:13,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=5480, Unknown=0, NotChecked=0, Total=6806 [2022-11-03 03:45:13,624 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:15,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:15,071 INFO L93 Difference]: Finished difference Result 396 states and 423 transitions. [2022-11-03 03:45:15,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-03 03:45:15,072 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2022-11-03 03:45:15,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:15,072 INFO L225 Difference]: With dead ends: 396 [2022-11-03 03:45:15,073 INFO L226 Difference]: Without dead ends: 214 [2022-11-03 03:45:15,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 343 SyntacticMatches, 41 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5598 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3510, Invalid=12746, Unknown=0, NotChecked=0, Total=16256 [2022-11-03 03:45:15,075 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 306 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 587 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 587 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:15,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 555 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 587 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:45:15,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-11-03 03:45:15,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2022-11-03 03:45:15,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:15,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2022-11-03 03:45:15,094 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 140 [2022-11-03 03:45:15,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:15,095 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2022-11-03 03:45:15,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 3.310810810810811) internal successors, (245), 74 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:15,095 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2022-11-03 03:45:15,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-03 03:45:15,097 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:15,097 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:15,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:15,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 03:45:15,311 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:15,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:15,311 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 25 times [2022-11-03 03:45:15,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:15,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657163629] [2022-11-03 03:45:15,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:15,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:16,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:16,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:16,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657163629] [2022-11-03 03:45:16,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657163629] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:16,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350622014] [2022-11-03 03:45:16,255 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:45:16,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:16,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:16,256 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:16,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 03:45:16,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:16,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 03:45:16,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:16,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:16,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:17,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:17,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350622014] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:17,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603107536] [2022-11-03 03:45:17,247 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:17,247 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:17,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:17,247 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:17,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:17,340 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:17,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23193#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:17,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:17,749 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:17,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2022-11-03 03:45:17,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229493105] [2022-11-03 03:45:17,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:17,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-03 03:45:17,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:17,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-03 03:45:17,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1079, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 03:45:17,751 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:18,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:18,309 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2022-11-03 03:45:18,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-03 03:45:18,310 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2022-11-03 03:45:18,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:18,311 INFO L225 Difference]: With dead ends: 162 [2022-11-03 03:45:18,311 INFO L226 Difference]: Without dead ends: 160 [2022-11-03 03:45:18,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 396 SyntacticMatches, 45 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1827 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1162, Invalid=2998, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 03:45:18,312 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 163 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:18,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 192 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:45:18,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-03 03:45:18,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2022-11-03 03:45:18,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:18,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2022-11-03 03:45:18,337 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2022-11-03 03:45:18,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:18,338 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2022-11-03 03:45:18,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:18,338 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2022-11-03 03:45:18,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-03 03:45:18,340 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:18,340 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:18,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:18,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:18,567 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:18,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:18,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 26 times [2022-11-03 03:45:18,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:18,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434974839] [2022-11-03 03:45:18,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:18,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:18,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:20,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:20,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:20,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434974839] [2022-11-03 03:45:20,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434974839] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:20,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642356335] [2022-11-03 03:45:20,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:20,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:20,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:20,007 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:20,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 03:45:20,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-11-03 03:45:20,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:20,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-03 03:45:20,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:21,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1152 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:21,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:22,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1152 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:22,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642356335] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:22,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [541496684] [2022-11-03 03:45:22,489 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:22,489 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:22,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:22,490 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:22,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:22,596 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:23,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24706#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:23,291 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:23,291 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:23,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 80 [2022-11-03 03:45:23,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038116513] [2022-11-03 03:45:23,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:23,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-03 03:45:23,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:23,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-03 03:45:23,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1538, Invalid=6294, Unknown=0, NotChecked=0, Total=7832 [2022-11-03 03:45:23,294 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 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) [2022-11-03 03:45:24,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:24,960 INFO L93 Difference]: Finished difference Result 430 states and 459 transitions. [2022-11-03 03:45:24,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-03 03:45:24,961 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 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 152 [2022-11-03 03:45:24,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:24,962 INFO L225 Difference]: With dead ends: 430 [2022-11-03 03:45:24,963 INFO L226 Difference]: Without dead ends: 232 [2022-11-03 03:45:24,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 373 SyntacticMatches, 45 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6511 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4112, Invalid=14794, Unknown=0, NotChecked=0, Total=18906 [2022-11-03 03:45:24,966 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 292 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 812 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:24,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 525 Invalid, 812 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:45:24,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-03 03:45:24,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2022-11-03 03:45:24,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:24,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2022-11-03 03:45:24,998 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 152 [2022-11-03 03:45:24,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:24,999 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2022-11-03 03:45:24,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.3125) internal successors, (265), 80 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) [2022-11-03 03:45:24,999 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2022-11-03 03:45:25,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2022-11-03 03:45:25,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:25,000 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:25,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:25,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 03:45:25,211 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:25,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:25,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 27 times [2022-11-03 03:45:25,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:25,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719534746] [2022-11-03 03:45:25,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:25,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:25,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:26,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:26,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:26,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719534746] [2022-11-03 03:45:26,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719534746] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:26,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477314675] [2022-11-03 03:45:26,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:45:26,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:26,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:26,177 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:26,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 03:45:26,290 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:45:26,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:26,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-03 03:45:26,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:26,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:26,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:27,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:27,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477314675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:27,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91791568] [2022-11-03 03:45:27,216 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:27,216 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:27,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:27,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:27,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:27,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:27,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26636#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:27,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:27,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:27,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2022-11-03 03:45:27,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703168980] [2022-11-03 03:45:27,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:27,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 03:45:27,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:27,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 03:45:27,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1182, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 03:45:27,738 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:28,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:28,323 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2022-11-03 03:45:28,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-03 03:45:28,324 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2022-11-03 03:45:28,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:28,325 INFO L225 Difference]: With dead ends: 174 [2022-11-03 03:45:28,325 INFO L226 Difference]: Without dead ends: 172 [2022-11-03 03:45:28,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 430 SyntacticMatches, 49 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1331, Invalid=3361, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 03:45:28,326 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 146 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:28,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 264 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:45:28,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-11-03 03:45:28,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2022-11-03 03:45:28,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:28,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2022-11-03 03:45:28,347 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2022-11-03 03:45:28,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:28,347 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2022-11-03 03:45:28,347 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:28,348 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2022-11-03 03:45:28,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-11-03 03:45:28,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:28,349 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:28,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:28,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:28,557 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:28,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:28,558 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 28 times [2022-11-03 03:45:28,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:28,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892059258] [2022-11-03 03:45:28,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:28,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:28,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:30,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:30,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:30,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892059258] [2022-11-03 03:45:30,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892059258] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:30,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257928534] [2022-11-03 03:45:30,167 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:45:30,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:30,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:30,168 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:30,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 03:45:30,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:30,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-03 03:45:30,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:31,867 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:45:31,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:32,908 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:45:32,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257928534] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:32,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884390652] [2022-11-03 03:45:32,910 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:32,910 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:32,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:32,911 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:32,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:33,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:33,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28264#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:33,731 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:33,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:33,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2022-11-03 03:45:33,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81963159] [2022-11-03 03:45:33,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:33,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-03 03:45:33,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:33,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-03 03:45:33,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2022-11-03 03:45:33,734 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:34,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:34,851 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2022-11-03 03:45:34,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-03 03:45:34,851 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2022-11-03 03:45:34,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:34,853 INFO L225 Difference]: With dead ends: 354 [2022-11-03 03:45:34,853 INFO L226 Difference]: Without dead ends: 245 [2022-11-03 03:45:34,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 405 SyntacticMatches, 50 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5333 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2022-11-03 03:45:34,855 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 211 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 698 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:34,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 666 Invalid, 903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 698 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:45:34,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-11-03 03:45:34,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2022-11-03 03:45:34,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:34,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2022-11-03 03:45:34,881 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2022-11-03 03:45:34,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:34,882 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2022-11-03 03:45:34,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:34,882 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2022-11-03 03:45:34,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-11-03 03:45:34,883 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:34,883 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:34,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:35,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:35,099 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:35,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:35,099 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 29 times [2022-11-03 03:45:35,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:35,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759149838] [2022-11-03 03:45:35,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:35,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:35,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:36,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:36,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:36,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759149838] [2022-11-03 03:45:36,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759149838] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:36,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133765578] [2022-11-03 03:45:36,665 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:45:36,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:36,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:36,667 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:36,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 03:45:36,833 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-11-03 03:45:36,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:36,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-03 03:45:36,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:37,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:37,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:39,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:39,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133765578] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:39,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554842826] [2022-11-03 03:45:39,908 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:39,908 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:39,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:39,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:39,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:40,000 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:40,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30161#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:40,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:40,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:40,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 29, 29] total 84 [2022-11-03 03:45:40,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444799228] [2022-11-03 03:45:40,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:40,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-03 03:45:40,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:40,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-03 03:45:40,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=7277, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 03:45:40,713 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:44,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:44,040 INFO L93 Difference]: Finished difference Result 368 states and 399 transitions. [2022-11-03 03:45:44,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-11-03 03:45:44,040 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2022-11-03 03:45:44,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:44,041 INFO L225 Difference]: With dead ends: 368 [2022-11-03 03:45:44,041 INFO L226 Difference]: Without dead ends: 257 [2022-11-03 03:45:44,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 435 SyntacticMatches, 53 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16970 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=6088, Invalid=34112, Unknown=0, NotChecked=0, Total=40200 [2022-11-03 03:45:44,045 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 540 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 1569 mSolverCounterSat, 576 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 540 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 2145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 576 IncrementalHoareTripleChecker+Valid, 1569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:44,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [540 Valid, 389 Invalid, 2145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [576 Valid, 1569 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 03:45:44,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2022-11-03 03:45:44,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 173. [2022-11-03 03:45:44,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:44,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2022-11-03 03:45:44,073 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2022-11-03 03:45:44,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:44,073 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2022-11-03 03:45:44,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:44,074 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2022-11-03 03:45:44,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2022-11-03 03:45:44,075 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:44,075 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:44,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:44,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:44,295 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:44,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:44,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1621508872, now seen corresponding path program 30 times [2022-11-03 03:45:44,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:44,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940355227] [2022-11-03 03:45:44,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:44,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:44,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:45,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:45,919 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:45,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940355227] [2022-11-03 03:45:45,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940355227] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:45,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197424190] [2022-11-03 03:45:45,919 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:45:45,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:45,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:45,920 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:45,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-03 03:45:46,059 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:45:46,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:45:46,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-03 03:45:46,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:47,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:47,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:49,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:49,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197424190] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:49,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1340894872] [2022-11-03 03:45:49,378 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:49,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:49,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:49,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:49,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:49,493 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:50,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:50,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:50,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:50,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 30, 30] total 87 [2022-11-03 03:45:50,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543213348] [2022-11-03 03:45:50,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:50,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-03 03:45:50,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:50,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-03 03:45:50,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=7753, Unknown=0, NotChecked=0, Total=9120 [2022-11-03 03:45:50,225 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:53,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:45:53,749 INFO L93 Difference]: Finished difference Result 381 states and 413 transitions. [2022-11-03 03:45:53,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-11-03 03:45:53,749 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2022-11-03 03:45:53,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:45:53,751 INFO L225 Difference]: With dead ends: 381 [2022-11-03 03:45:53,751 INFO L226 Difference]: Without dead ends: 266 [2022-11-03 03:45:53,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 451 SyntacticMatches, 55 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18229 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6522, Invalid=36534, Unknown=0, NotChecked=0, Total=43056 [2022-11-03 03:45:53,755 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 520 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 1751 mSolverCounterSat, 532 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 488 SdHoareTripleChecker+Invalid, 2283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 532 IncrementalHoareTripleChecker+Valid, 1751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:45:53,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [520 Valid, 488 Invalid, 2283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [532 Valid, 1751 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:45:53,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2022-11-03 03:45:53,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 179. [2022-11-03 03:45:53,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:53,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2022-11-03 03:45:53,776 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 172 [2022-11-03 03:45:53,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:45:53,776 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2022-11-03 03:45:53,777 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:45:53,777 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2022-11-03 03:45:53,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 03:45:53,778 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:45:53,778 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:45:53,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-03 03:45:53,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-03 03:45:53,987 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:45:53,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:45:53,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 31 times [2022-11-03 03:45:53,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:45:53,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997670233] [2022-11-03 03:45:53,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:45:53,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:45:54,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:55,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:55,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:45:55,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997670233] [2022-11-03 03:45:55,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997670233] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:45:55,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008273797] [2022-11-03 03:45:55,727 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:45:55,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:45:55,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:45:55,728 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:45:55,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-03 03:45:55,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:45:55,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 03:45:55,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:45:57,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:57,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:45:58,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:45:58,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008273797] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:45:58,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737160515] [2022-11-03 03:45:58,894 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:45:58,894 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:45:58,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:45:58,894 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:45:58,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:45:58,992 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:45:59,745 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34552#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:45:59,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:45:59,745 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:45:59,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-11-03 03:45:59,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528770080] [2022-11-03 03:45:59,746 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:45:59,746 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-03 03:45:59,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:45:59,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-03 03:45:59,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2022-11-03 03:45:59,748 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:01,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:01,052 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2022-11-03 03:46:01,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-03 03:46:01,052 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2022-11-03 03:46:01,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:01,054 INFO L225 Difference]: With dead ends: 387 [2022-11-03 03:46:01,054 INFO L226 Difference]: Without dead ends: 268 [2022-11-03 03:46:01,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 438 SyntacticMatches, 56 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6346 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2022-11-03 03:46:01,056 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 210 mSDsluCounter, 692 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:01,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 752 Invalid, 961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:46:01,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-03 03:46:01,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2022-11-03 03:46:01,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:01,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2022-11-03 03:46:01,087 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2022-11-03 03:46:01,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:01,087 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2022-11-03 03:46:01,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:01,088 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2022-11-03 03:46:01,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-11-03 03:46:01,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:01,089 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:01,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:01,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-03 03:46:01,314 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:01,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:01,315 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 32 times [2022-11-03 03:46:01,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:01,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072513002] [2022-11-03 03:46:01,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:01,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:01,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:02,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:02,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:02,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072513002] [2022-11-03 03:46:02,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072513002] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:02,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954242526] [2022-11-03 03:46:02,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:46:02,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:02,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:02,361 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:02,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-03 03:46:02,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-03 03:46:02,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:02,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 03:46:02,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:02,782 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:02,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:03,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954242526] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1812939715] [2022-11-03 03:46:03,685 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:03,685 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:03,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:03,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:03,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:03,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:04,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36560#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:04,304 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:04,304 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:04,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2022-11-03 03:46:04,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205651413] [2022-11-03 03:46:04,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:04,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-03 03:46:04,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:04,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-03 03:46:04,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1400, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 03:46:04,306 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:05,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:05,013 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2022-11-03 03:46:05,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-03 03:46:05,014 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2022-11-03 03:46:05,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:05,015 INFO L225 Difference]: With dead ends: 198 [2022-11-03 03:46:05,015 INFO L226 Difference]: Without dead ends: 196 [2022-11-03 03:46:05,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 498 SyntacticMatches, 57 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2637 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1705, Invalid=4147, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 03:46:05,019 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 166 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:05,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 279 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:46:05,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-03 03:46:05,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2022-11-03 03:46:05,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:05,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2022-11-03 03:46:05,064 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2022-11-03 03:46:05,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:05,065 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2022-11-03 03:46:05,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:05,065 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2022-11-03 03:46:05,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-11-03 03:46:05,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:05,067 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:05,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:05,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:05,291 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:05,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:05,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 33 times [2022-11-03 03:46:05,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:05,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094245455] [2022-11-03 03:46:05,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:05,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:05,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:07,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:07,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:07,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094245455] [2022-11-03 03:46:07,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094245455] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:07,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425887737] [2022-11-03 03:46:07,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:07,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:07,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:07,220 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:07,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-03 03:46:07,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:07,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:07,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-03 03:46:07,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:09,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:09,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:10,878 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:10,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425887737] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:10,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1062899407] [2022-11-03 03:46:10,880 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:10,880 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:10,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:10,880 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:10,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:10,980 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:11,763 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38427#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:11,763 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:11,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:11,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 98 [2022-11-03 03:46:11,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519723366] [2022-11-03 03:46:11,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:11,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-11-03 03:46:11,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:11,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-11-03 03:46:11,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2270, Invalid=9072, Unknown=0, NotChecked=0, Total=11342 [2022-11-03 03:46:11,766 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:14,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:14,038 INFO L93 Difference]: Finished difference Result 532 states and 567 transitions. [2022-11-03 03:46:14,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-03 03:46:14,038 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2022-11-03 03:46:14,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:14,040 INFO L225 Difference]: With dead ends: 532 [2022-11-03 03:46:14,040 INFO L226 Difference]: Without dead ends: 286 [2022-11-03 03:46:14,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 463 SyntacticMatches, 57 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9658 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=6206, Invalid=21850, Unknown=0, NotChecked=0, Total=28056 [2022-11-03 03:46:14,042 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 422 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 781 SdHoareTripleChecker+Invalid, 1047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:14,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [422 Valid, 781 Invalid, 1047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 03:46:14,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-03 03:46:14,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2022-11-03 03:46:14,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:14,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2022-11-03 03:46:14,075 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2022-11-03 03:46:14,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:14,075 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2022-11-03 03:46:14,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:14,076 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2022-11-03 03:46:14,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-11-03 03:46:14,077 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:14,077 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:14,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:14,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-03 03:46:14,283 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:14,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:14,283 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 34 times [2022-11-03 03:46:14,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:14,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860956493] [2022-11-03 03:46:14,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:14,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:15,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:15,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:15,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860956493] [2022-11-03 03:46:15,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860956493] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:15,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920657853] [2022-11-03 03:46:15,451 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:46:15,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:15,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:15,452 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:15,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-03 03:46:15,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:15,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-03 03:46:15,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:15,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:15,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:16,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:16,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920657853] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:16,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1255372517] [2022-11-03 03:46:16,961 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:16,961 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:16,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:16,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:16,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:17,064 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:17,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40807#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:17,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:17,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:17,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2022-11-03 03:46:17,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907724737] [2022-11-03 03:46:17,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:17,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 03:46:17,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:17,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 03:46:17,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=1515, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 03:46:17,531 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:18,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:18,282 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2022-11-03 03:46:18,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-03 03:46:18,282 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2022-11-03 03:46:18,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:18,283 INFO L225 Difference]: With dead ends: 210 [2022-11-03 03:46:18,283 INFO L226 Difference]: Without dead ends: 208 [2022-11-03 03:46:18,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 532 SyntacticMatches, 61 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2939 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1910, Invalid=4570, Unknown=0, NotChecked=0, Total=6480 [2022-11-03 03:46:18,285 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 244 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:18,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 243 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:46:18,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-03 03:46:18,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2022-11-03 03:46:18,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:18,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2022-11-03 03:46:18,319 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2022-11-03 03:46:18,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:18,320 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2022-11-03 03:46:18,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:18,320 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2022-11-03 03:46:18,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-11-03 03:46:18,321 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:18,321 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:18,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:18,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-03 03:46:18,535 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:18,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:18,535 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 35 times [2022-11-03 03:46:18,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:18,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664899809] [2022-11-03 03:46:18,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:18,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:18,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:20,689 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:20,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:20,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664899809] [2022-11-03 03:46:20,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664899809] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:20,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96060757] [2022-11-03 03:46:20,690 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:46:20,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:20,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:20,691 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:20,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-03 03:46:20,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-11-03 03:46:20,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:20,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-03 03:46:20,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:23,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:23,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:24,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:24,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96060757] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:24,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [656194952] [2022-11-03 03:46:24,647 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:24,647 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:24,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:24,648 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:24,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:24,767 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:25,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42792#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:25,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:25,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:25,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 104 [2022-11-03 03:46:25,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529880327] [2022-11-03 03:46:25,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:25,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-03 03:46:25,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:25,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-03 03:46:25,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=10110, Unknown=0, NotChecked=0, Total=12656 [2022-11-03 03:46:25,581 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:28,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:28,240 INFO L93 Difference]: Finished difference Result 566 states and 603 transitions. [2022-11-03 03:46:28,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-03 03:46:28,240 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2022-11-03 03:46:28,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:28,242 INFO L225 Difference]: With dead ends: 566 [2022-11-03 03:46:28,242 INFO L226 Difference]: Without dead ends: 304 [2022-11-03 03:46:28,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 493 SyntacticMatches, 61 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10843 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=7000, Invalid=24506, Unknown=0, NotChecked=0, Total=31506 [2022-11-03 03:46:28,245 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 380 mSDsluCounter, 973 mSDsCounter, 0 mSdLazyCounter, 1080 mSolverCounterSat, 366 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 1039 SdHoareTripleChecker+Invalid, 1446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 366 IncrementalHoareTripleChecker+Valid, 1080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:28,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [380 Valid, 1039 Invalid, 1446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [366 Valid, 1080 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:46:28,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-03 03:46:28,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2022-11-03 03:46:28,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:28,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2022-11-03 03:46:28,280 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2022-11-03 03:46:28,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:28,280 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2022-11-03 03:46:28,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:28,281 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2022-11-03 03:46:28,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2022-11-03 03:46:28,282 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:28,282 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:28,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:28,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-03 03:46:28,491 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:28,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:28,491 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 36 times [2022-11-03 03:46:28,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:28,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951618890] [2022-11-03 03:46:28,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:28,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:28,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:29,814 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:29,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:29,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951618890] [2022-11-03 03:46:29,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951618890] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:29,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331727818] [2022-11-03 03:46:29,814 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:29,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:29,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:29,819 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:29,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-03 03:46:29,955 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:29,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:29,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-03 03:46:29,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:30,264 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:30,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:31,403 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:31,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331727818] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:31,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [390785476] [2022-11-03 03:46:31,407 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:31,407 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:31,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:31,408 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:31,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:31,498 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:31,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45322#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:31,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:31,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:31,967 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2022-11-03 03:46:31,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120727284] [2022-11-03 03:46:31,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:31,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-03 03:46:31,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:31,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-03 03:46:31,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1634, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 03:46:31,969 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:32,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:32,772 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2022-11-03 03:46:32,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-03 03:46:32,773 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 204 [2022-11-03 03:46:32,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:32,774 INFO L225 Difference]: With dead ends: 222 [2022-11-03 03:46:32,775 INFO L226 Difference]: Without dead ends: 220 [2022-11-03 03:46:32,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 566 SyntacticMatches, 65 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3257 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2127, Invalid=5013, Unknown=0, NotChecked=0, Total=7140 [2022-11-03 03:46:32,776 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 223 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:32,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 281 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:46:32,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-11-03 03:46:32,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2022-11-03 03:46:32,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:32,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2022-11-03 03:46:32,808 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2022-11-03 03:46:32,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:32,809 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2022-11-03 03:46:32,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:32,809 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2022-11-03 03:46:32,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2022-11-03 03:46:32,810 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:32,810 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:32,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:33,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:33,011 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:33,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:33,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 37 times [2022-11-03 03:46:33,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:33,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159693593] [2022-11-03 03:46:33,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:33,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:33,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:35,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:35,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:35,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159693593] [2022-11-03 03:46:35,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159693593] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:35,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748391830] [2022-11-03 03:46:35,390 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:46:35,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:35,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:35,391 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:35,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-03 03:46:35,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:35,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-03 03:46:35,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:37,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:46:37,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:39,516 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:46:39,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748391830] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:39,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [605630215] [2022-11-03 03:46:39,518 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:39,518 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:39,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:39,518 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:39,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:39,624 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:40,453 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47422#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:40,453 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:40,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:40,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2022-11-03 03:46:40,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357229976] [2022-11-03 03:46:40,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:40,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-03 03:46:40,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:40,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-03 03:46:40,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 03:46:40,456 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:42,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:42,111 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2022-11-03 03:46:42,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-03 03:46:42,112 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2022-11-03 03:46:42,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:42,112 INFO L225 Difference]: With dead ends: 458 [2022-11-03 03:46:42,112 INFO L226 Difference]: Without dead ends: 317 [2022-11-03 03:46:42,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 525 SyntacticMatches, 66 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2022-11-03 03:46:42,114 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 289 mSDsluCounter, 725 mSDsCounter, 0 mSdLazyCounter, 845 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 1046 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:42,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 795 Invalid, 1046 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 845 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 03:46:42,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-11-03 03:46:42,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2022-11-03 03:46:42,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:42,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2022-11-03 03:46:42,139 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2022-11-03 03:46:42,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:42,139 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2022-11-03 03:46:42,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:42,139 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2022-11-03 03:46:42,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-11-03 03:46:42,140 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:42,140 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:42,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:42,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-03 03:46:42,341 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:42,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:42,342 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 38 times [2022-11-03 03:46:42,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:42,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477805766] [2022-11-03 03:46:42,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:42,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:42,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:44,821 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:44,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:44,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477805766] [2022-11-03 03:46:44,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477805766] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:44,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941290186] [2022-11-03 03:46:44,822 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:46:44,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:44,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:44,823 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:44,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-03 03:46:45,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-11-03 03:46:45,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:45,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-03 03:46:45,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:46:46,862 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 1190 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:46,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:46:50,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 1190 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:50,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941290186] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:46:50,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496018229] [2022-11-03 03:46:50,047 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:46:50,047 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:46:50,048 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:46:50,048 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:46:50,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:46:50,139 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:46:50,981 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49871#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:46:50,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:46:50,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:46:50,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 37, 37] total 108 [2022-11-03 03:46:50,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494766462] [2022-11-03 03:46:50,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:46:50,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-03 03:46:50,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:46:50,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-03 03:46:50,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=11505, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 03:46:50,984 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:56,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:46:56,009 INFO L93 Difference]: Finished difference Result 472 states and 511 transitions. [2022-11-03 03:46:56,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2022-11-03 03:46:56,010 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have 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 [2022-11-03 03:46:56,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:46:56,012 INFO L225 Difference]: With dead ends: 472 [2022-11-03 03:46:56,012 INFO L226 Difference]: Without dead ends: 329 [2022-11-03 03:46:56,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 563 SyntacticMatches, 69 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28302 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=9980, Invalid=55812, Unknown=0, NotChecked=0, Total=65792 [2022-11-03 03:46:56,032 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 764 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 2161 mSolverCounterSat, 860 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 764 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 3021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 860 IncrementalHoareTripleChecker+Valid, 2161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:46:56,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [764 Valid, 462 Invalid, 3021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [860 Valid, 2161 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 03:46:56,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-11-03 03:46:56,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 221. [2022-11-03 03:46:56,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 220 states have (on average 1.0136363636363637) internal successors, (223), 220 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) [2022-11-03 03:46:56,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 223 transitions. [2022-11-03 03:46:56,076 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 223 transitions. Word has length 214 [2022-11-03 03:46:56,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:46:56,076 INFO L495 AbstractCegarLoop]: Abstraction has 221 states and 223 transitions. [2022-11-03 03:46:56,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 3.9537037037037037) internal successors, (427), 108 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:46:56,076 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 223 transitions. [2022-11-03 03:46:56,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2022-11-03 03:46:56,077 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:46:56,078 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:46:56,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-03 03:46:56,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:56,287 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:46:56,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:46:56,288 INFO L85 PathProgramCache]: Analyzing trace with hash 1440636088, now seen corresponding path program 39 times [2022-11-03 03:46:56,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:46:56,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295415565] [2022-11-03 03:46:56,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:46:56,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:46:56,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:46:58,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 2348 proven. 1362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:46:58,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:46:58,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295415565] [2022-11-03 03:46:58,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295415565] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:46:58,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201264272] [2022-11-03 03:46:58,877 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:46:58,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:46:58,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:46:58,878 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:46:58,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-03 03:46:59,022 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:46:59,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:46:59,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-03 03:46:59,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:00,903 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 1260 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:00,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:04,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3710 backedges. 1260 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:04,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201264272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:04,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624703983] [2022-11-03 03:47:04,190 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:04,190 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:04,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:04,191 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:04,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:04,322 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:05,184 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52636#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:05,184 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:05,184 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:05,184 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 38, 38] total 111 [2022-11-03 03:47:05,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377922475] [2022-11-03 03:47:05,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:05,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-03 03:47:05,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:05,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-03 03:47:05,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2179, Invalid=12101, Unknown=0, NotChecked=0, Total=14280 [2022-11-03 03:47:05,187 INFO L87 Difference]: Start difference. First operand 221 states and 223 transitions. Second operand has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:10,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:10,343 INFO L93 Difference]: Finished difference Result 485 states and 525 transitions. [2022-11-03 03:47:10,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2022-11-03 03:47:10,343 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 220 [2022-11-03 03:47:10,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:10,345 INFO L225 Difference]: With dead ends: 485 [2022-11-03 03:47:10,345 INFO L226 Difference]: Without dead ends: 338 [2022-11-03 03:47:10,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 912 GetRequests, 579 SyntacticMatches, 71 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29921 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=10534, Invalid=58898, Unknown=0, NotChecked=0, Total=69432 [2022-11-03 03:47:10,349 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 642 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 2069 mSolverCounterSat, 699 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 642 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 2768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 699 IncrementalHoareTripleChecker+Valid, 2069 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:10,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [642 Valid, 553 Invalid, 2768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [699 Valid, 2069 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 03:47:10,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2022-11-03 03:47:10,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 227. [2022-11-03 03:47:10,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:10,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2022-11-03 03:47:10,385 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 220 [2022-11-03 03:47:10,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:10,385 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2022-11-03 03:47:10,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 3.954954954954955) internal successors, (439), 111 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:10,385 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2022-11-03 03:47:10,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-11-03 03:47:10,401 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:10,401 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:10,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:10,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:10,602 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:10,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:10,602 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 40 times [2022-11-03 03:47:10,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:10,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549366696] [2022-11-03 03:47:10,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:10,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:10,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:13,472 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:13,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:47:13,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549366696] [2022-11-03 03:47:13,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549366696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:13,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231830358] [2022-11-03 03:47:13,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:47:13,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:13,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:13,474 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:13,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-03 03:47:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:13,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-03 03:47:13,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:16,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:18,233 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:18,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231830358] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:18,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [763943288] [2022-11-03 03:47:18,234 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:18,234 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:18,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:18,235 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:18,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:18,344 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:19,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:19,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:19,215 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:19,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2022-11-03 03:47:19,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961209999] [2022-11-03 03:47:19,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:19,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-03 03:47:19,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:19,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-03 03:47:19,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2022-11-03 03:47:19,218 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:21,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:21,140 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2022-11-03 03:47:21,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-03 03:47:21,141 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 226 [2022-11-03 03:47:21,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:21,142 INFO L225 Difference]: With dead ends: 491 [2022-11-03 03:47:21,142 INFO L226 Difference]: Without dead ends: 340 [2022-11-03 03:47:21,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 558 SyntacticMatches, 72 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9874 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2022-11-03 03:47:21,144 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 333 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 793 SdHoareTripleChecker+Invalid, 1140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:21,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 793 Invalid, 1140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 03:47:21,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-03 03:47:21,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2022-11-03 03:47:21,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:21,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2022-11-03 03:47:21,177 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2022-11-03 03:47:21,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:21,177 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2022-11-03 03:47:21,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:21,178 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2022-11-03 03:47:21,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2022-11-03 03:47:21,179 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:21,179 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:21,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:21,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:21,380 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:21,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:21,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 41 times [2022-11-03 03:47:21,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:21,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074969936] [2022-11-03 03:47:21,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:21,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:21,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:23,024 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:23,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:47:23,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074969936] [2022-11-03 03:47:23,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074969936] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:23,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206791163] [2022-11-03 03:47:23,024 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:47:23,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:23,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:23,026 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:23,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-03 03:47:23,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-11-03 03:47:23,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:47:23,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-03 03:47:23,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:23,594 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:23,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:24,950 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:24,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206791163] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:24,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1851987182] [2022-11-03 03:47:24,951 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:24,951 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:24,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:24,951 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:24,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:25,056 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:25,549 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58022#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:25,549 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:25,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:25,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2022-11-03 03:47:25,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196423476] [2022-11-03 03:47:25,550 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:25,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-03 03:47:25,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:25,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-03 03:47:25,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=1884, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 03:47:25,551 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:26,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:26,485 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2022-11-03 03:47:26,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-03 03:47:26,486 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2022-11-03 03:47:26,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:26,487 INFO L225 Difference]: With dead ends: 246 [2022-11-03 03:47:26,487 INFO L226 Difference]: Without dead ends: 244 [2022-11-03 03:47:26,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 634 SyntacticMatches, 73 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2597, Invalid=5959, Unknown=0, NotChecked=0, Total=8556 [2022-11-03 03:47:26,488 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 165 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:26,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 342 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 399 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:47:26,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-11-03 03:47:26,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2022-11-03 03:47:26,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:26,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2022-11-03 03:47:26,531 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2022-11-03 03:47:26,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:26,532 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2022-11-03 03:47:26,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:26,532 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2022-11-03 03:47:26,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2022-11-03 03:47:26,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:26,534 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:26,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:26,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-03 03:47:26,747 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:26,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:26,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 42 times [2022-11-03 03:47:26,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:26,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576002207] [2022-11-03 03:47:26,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:26,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:26,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:29,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:29,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:47:29,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576002207] [2022-11-03 03:47:29,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576002207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:29,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81186791] [2022-11-03 03:47:29,673 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:47:29,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:29,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:29,674 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:29,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-03 03:47:29,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:47:29,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:47:29,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-03 03:47:29,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:32,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2888 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:32,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:34,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2888 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:34,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81186791] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:34,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [716234505] [2022-11-03 03:47:34,855 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:34,855 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:34,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:34,855 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:34,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:34,952 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:35,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60361#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:35,876 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:35,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:35,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 122 [2022-11-03 03:47:35,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953064457] [2022-11-03 03:47:35,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:35,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2022-11-03 03:47:35,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:35,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2022-11-03 03:47:35,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3470, Invalid=13560, Unknown=0, NotChecked=0, Total=17030 [2022-11-03 03:47:35,880 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 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) [2022-11-03 03:47:39,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:39,310 INFO L93 Difference]: Finished difference Result 668 states and 711 transitions. [2022-11-03 03:47:39,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-03 03:47:39,311 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 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 236 [2022-11-03 03:47:39,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:39,312 INFO L225 Difference]: With dead ends: 668 [2022-11-03 03:47:39,312 INFO L226 Difference]: Without dead ends: 358 [2022-11-03 03:47:39,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 583 SyntacticMatches, 73 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14806 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=9670, Invalid=33386, Unknown=0, NotChecked=0, Total=43056 [2022-11-03 03:47:39,315 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 599 mSDsluCounter, 976 mSDsCounter, 0 mSdLazyCounter, 1110 mSolverCounterSat, 466 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 1576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 466 IncrementalHoareTripleChecker+Valid, 1110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:39,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [599 Valid, 1054 Invalid, 1576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [466 Valid, 1110 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 03:47:39,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-11-03 03:47:39,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2022-11-03 03:47:39,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:39,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2022-11-03 03:47:39,360 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 236 [2022-11-03 03:47:39,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:39,360 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2022-11-03 03:47:39,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 3.319672131147541) internal successors, (405), 122 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) [2022-11-03 03:47:39,360 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2022-11-03 03:47:39,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-03 03:47:39,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:39,362 INFO L195 NwaCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:39,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:39,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-03 03:47:39,567 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:39,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:39,567 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 43 times [2022-11-03 03:47:39,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:39,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444524188] [2022-11-03 03:47:39,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:39,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:39,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:41,404 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:41,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:47:41,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444524188] [2022-11-03 03:47:41,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444524188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:41,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905719350] [2022-11-03 03:47:41,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:47:41,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:41,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:41,406 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:41,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-03 03:47:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:41,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-03 03:47:41,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:41,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:43,438 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:43,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905719350] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:43,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68273716] [2022-11-03 03:47:43,441 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:43,441 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:43,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:43,441 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:43,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:43,545 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:44,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63341#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:44,052 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:44,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:44,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2022-11-03 03:47:44,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796506833] [2022-11-03 03:47:44,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:44,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-03 03:47:44,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:44,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-03 03:47:44,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2015, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 03:47:44,053 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:45,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:45,075 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2022-11-03 03:47:45,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-03 03:47:45,076 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 240 [2022-11-03 03:47:45,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:45,077 INFO L225 Difference]: With dead ends: 258 [2022-11-03 03:47:45,077 INFO L226 Difference]: Without dead ends: 256 [2022-11-03 03:47:45,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 668 SyntacticMatches, 77 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4307 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2850, Invalid=6462, Unknown=0, NotChecked=0, Total=9312 [2022-11-03 03:47:45,079 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 256 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:45,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 358 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:47:45,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-03 03:47:45,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2022-11-03 03:47:45,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:45,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2022-11-03 03:47:45,130 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2022-11-03 03:47:45,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:45,131 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2022-11-03 03:47:45,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:45,131 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2022-11-03 03:47:45,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2022-11-03 03:47:45,133 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:45,133 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:45,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:45,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:45,347 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:45,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:45,348 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 44 times [2022-11-03 03:47:45,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:45,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129303316] [2022-11-03 03:47:45,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:45,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:45,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:48,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:47:48,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129303316] [2022-11-03 03:47:48,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129303316] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:48,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292779798] [2022-11-03 03:47:48,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:47:48,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:48,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:48,598 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:48,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-03 03:47:48,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-11-03 03:47:48,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:47:48,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 83 conjunts are in the unsatisfiable core [2022-11-03 03:47:48,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:52,023 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3200 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:52,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:54,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3200 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:54,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292779798] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:54,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2108369917] [2022-11-03 03:47:54,357 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:47:54,357 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:47:54,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:47:54,357 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:47:54,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:47:54,468 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:47:55,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65798#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:47:55,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:47:55,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:55,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 128 [2022-11-03 03:47:55,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281673615] [2022-11-03 03:47:55,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:55,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-03 03:47:55,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:47:55,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-03 03:47:55,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3810, Invalid=14822, Unknown=0, NotChecked=0, Total=18632 [2022-11-03 03:47:55,416 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:59,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:59,248 INFO L93 Difference]: Finished difference Result 702 states and 747 transitions. [2022-11-03 03:47:59,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-03 03:47:59,248 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 248 [2022-11-03 03:47:59,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:59,250 INFO L225 Difference]: With dead ends: 702 [2022-11-03 03:47:59,250 INFO L226 Difference]: Without dead ends: 376 [2022-11-03 03:47:59,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 613 SyntacticMatches, 77 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16263 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=10656, Invalid=36650, Unknown=0, NotChecked=0, Total=47306 [2022-11-03 03:47:59,254 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 499 mSDsluCounter, 1217 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 499 SdHoareTripleChecker+Valid, 1299 SdHoareTripleChecker+Invalid, 1695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:59,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [499 Valid, 1299 Invalid, 1695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 03:47:59,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-03 03:47:59,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2022-11-03 03:47:59,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:59,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2022-11-03 03:47:59,307 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 248 [2022-11-03 03:47:59,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:59,307 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2022-11-03 03:47:59,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 3.3203125) internal successors, (425), 128 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:59,308 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2022-11-03 03:47:59,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2022-11-03 03:47:59,309 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:59,309 INFO L195 NwaCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:59,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:59,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-03 03:47:59,515 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:47:59,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:59,515 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 45 times [2022-11-03 03:47:59,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:47:59,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645676795] [2022-11-03 03:47:59,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:59,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:47:59,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:01,556 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:01,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:48:01,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645676795] [2022-11-03 03:48:01,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645676795] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:01,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77115445] [2022-11-03 03:48:01,557 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:48:01,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:01,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:01,561 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:01,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-03 03:48:01,718 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:48:01,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:01,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-03 03:48:01,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:02,046 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:02,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:03,686 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:03,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77115445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:03,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317168297] [2022-11-03 03:48:03,688 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:48:03,688 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:48:03,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:48:03,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:48:03,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:48:03,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:48:04,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68928#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:48:04,303 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:48:04,303 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:04,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2022-11-03 03:48:04,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956587891] [2022-11-03 03:48:04,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:04,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-03 03:48:04,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:48:04,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-03 03:48:04,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=2150, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 03:48:04,306 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:05,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:05,405 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2022-11-03 03:48:05,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-03 03:48:05,406 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2022-11-03 03:48:05,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:05,407 INFO L225 Difference]: With dead ends: 270 [2022-11-03 03:48:05,407 INFO L226 Difference]: Without dead ends: 268 [2022-11-03 03:48:05,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 702 SyntacticMatches, 81 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4689 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3115, Invalid=6985, Unknown=0, NotChecked=0, Total=10100 [2022-11-03 03:48:05,408 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 274 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:05,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 350 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:48:05,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-03 03:48:05,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2022-11-03 03:48:05,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:05,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2022-11-03 03:48:05,462 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2022-11-03 03:48:05,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:05,463 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2022-11-03 03:48:05,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:05,463 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2022-11-03 03:48:05,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-11-03 03:48:05,465 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:05,465 INFO L195 NwaCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:05,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:05,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-03 03:48:05,687 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:48:05,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:05,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 46 times [2022-11-03 03:48:05,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:48:05,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373361805] [2022-11-03 03:48:05,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:05,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:48:05,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:09,258 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:09,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:48:09,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373361805] [2022-11-03 03:48:09,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373361805] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:09,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822626116] [2022-11-03 03:48:09,259 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:48:09,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:09,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:09,260 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:09,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-03 03:48:09,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:09,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-03 03:48:09,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:12,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:48:12,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:15,229 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:48:15,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822626116] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:15,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1529773458] [2022-11-03 03:48:15,230 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:48:15,230 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:48:15,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:48:15,231 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:48:15,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:48:15,340 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:48:16,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71500#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:48:16,302 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:48:16,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:16,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2022-11-03 03:48:16,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266348719] [2022-11-03 03:48:16,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:16,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-11-03 03:48:16,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:48:16,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-11-03 03:48:16,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2022-11-03 03:48:16,305 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:18,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:18,834 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2022-11-03 03:48:18,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-03 03:48:18,835 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 260 [2022-11-03 03:48:18,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:18,836 INFO L225 Difference]: With dead ends: 562 [2022-11-03 03:48:18,836 INFO L226 Difference]: Without dead ends: 389 [2022-11-03 03:48:18,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 645 SyntacticMatches, 82 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12645 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2022-11-03 03:48:18,838 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 378 mSDsluCounter, 958 mSDsCounter, 0 mSdLazyCounter, 1099 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 1044 SdHoareTripleChecker+Invalid, 1442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 1099 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:18,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [378 Valid, 1044 Invalid, 1442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 1099 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:48:18,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-11-03 03:48:18,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2022-11-03 03:48:18,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:18,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2022-11-03 03:48:18,879 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2022-11-03 03:48:18,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:18,879 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2022-11-03 03:48:18,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:18,880 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2022-11-03 03:48:18,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-11-03 03:48:18,881 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:18,881 INFO L195 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:18,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-11-03 03:48:19,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-03 03:48:19,103 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:48:19,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:19,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 47 times [2022-11-03 03:48:19,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:48:19,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552752010] [2022-11-03 03:48:19,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:19,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:48:19,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:22,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:22,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:48:22,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552752010] [2022-11-03 03:48:22,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552752010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:22,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800150452] [2022-11-03 03:48:22,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:48:22,802 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:22,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:22,803 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:22,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-03 03:48:23,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2022-11-03 03:48:23,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:23,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-03 03:48:23,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:25,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:25,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:30,356 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:30,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800150452] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:30,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173982498] [2022-11-03 03:48:30,358 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:48:30,358 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:48:30,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:48:30,358 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:48:30,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:48:30,450 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:48:31,420 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74501#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:48:31,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:48:31,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:31,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 45, 45] total 132 [2022-11-03 03:48:31,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543670109] [2022-11-03 03:48:31,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:31,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-11-03 03:48:31,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:48:31,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-11-03 03:48:31,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3047, Invalid=16693, Unknown=0, NotChecked=0, Total=19740 [2022-11-03 03:48:31,423 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:38,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:38,448 INFO L93 Difference]: Finished difference Result 576 states and 623 transitions. [2022-11-03 03:48:38,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2022-11-03 03:48:38,449 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2022-11-03 03:48:38,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:38,450 INFO L225 Difference]: With dead ends: 576 [2022-11-03 03:48:38,450 INFO L226 Difference]: Without dead ends: 401 [2022-11-03 03:48:38,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 691 SyntacticMatches, 85 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42514 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=14832, Invalid=82824, Unknown=0, NotChecked=0, Total=97656 [2022-11-03 03:48:38,455 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 836 mSDsluCounter, 721 mSDsCounter, 0 mSdLazyCounter, 2795 mSolverCounterSat, 890 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 836 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 3685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 890 IncrementalHoareTripleChecker+Valid, 2795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:38,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [836 Valid, 766 Invalid, 3685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [890 Valid, 2795 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-03 03:48:38,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-11-03 03:48:38,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 269. [2022-11-03 03:48:38,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:38,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2022-11-03 03:48:38,512 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 262 [2022-11-03 03:48:38,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:38,512 INFO L495 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2022-11-03 03:48:38,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:38,513 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2022-11-03 03:48:38,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2022-11-03 03:48:38,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:38,514 INFO L195 NwaCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:38,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:38,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:38,714 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:48:38,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:38,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1043592072, now seen corresponding path program 48 times [2022-11-03 03:48:38,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:48:38,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135403121] [2022-11-03 03:48:38,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:38,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:48:38,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:42,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:42,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:48:42,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135403121] [2022-11-03 03:48:42,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135403121] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:42,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995317469] [2022-11-03 03:48:42,710 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:48:42,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:42,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:42,711 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:42,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-03 03:48:42,877 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:48:42,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:42,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-03 03:48:42,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:45,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 1892 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:45,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:50,462 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 1892 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:48:50,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995317469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:50,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [126236849] [2022-11-03 03:48:50,463 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:48:50,463 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:48:50,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:48:50,463 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:48:50,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:48:50,558 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:48:51,540 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77874#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:48:51,540 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:48:51,540 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:51,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 46, 46] total 135 [2022-11-03 03:48:51,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612376572] [2022-11-03 03:48:51,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:51,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2022-11-03 03:48:51,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:48:51,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2022-11-03 03:48:51,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3183, Invalid=17409, Unknown=0, NotChecked=0, Total=20592 [2022-11-03 03:48:51,543 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 135 states, 135 states have (on average 3.962962962962963) internal successors, (535), 135 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:58,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:58,724 INFO L93 Difference]: Finished difference Result 589 states and 637 transitions. [2022-11-03 03:48:58,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2022-11-03 03:48:58,725 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 3.962962962962963) internal successors, (535), 135 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2022-11-03 03:48:58,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:58,727 INFO L225 Difference]: With dead ends: 589 [2022-11-03 03:48:58,727 INFO L226 Difference]: Without dead ends: 410 [2022-11-03 03:48:58,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1112 GetRequests, 707 SyntacticMatches, 87 SemanticMatches, 318 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44493 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=15506, Invalid=86574, Unknown=0, NotChecked=0, Total=102080 [2022-11-03 03:48:58,735 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 810 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 2811 mSolverCounterSat, 880 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 810 SdHoareTripleChecker+Valid, 616 SdHoareTripleChecker+Invalid, 3691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 880 IncrementalHoareTripleChecker+Valid, 2811 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:58,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [810 Valid, 616 Invalid, 3691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [880 Valid, 2811 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-03 03:48:58,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-11-03 03:48:58,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 275. [2022-11-03 03:48:58,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.010948905109489) internal successors, (277), 274 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:58,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-11-03 03:48:58,795 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 268 [2022-11-03 03:48:58,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:58,796 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-11-03 03:48:58,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 3.962962962962963) internal successors, (535), 135 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:48:58,796 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-11-03 03:48:58,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-11-03 03:48:58,797 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:58,798 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:58,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:59,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:59,023 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:48:59,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:59,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1664799344, now seen corresponding path program 49 times [2022-11-03 03:48:59,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:48:59,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286195680] [2022-11-03 03:48:59,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:59,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:48:59,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:03,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3743 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:03,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:49:03,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286195680] [2022-11-03 03:49:03,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286195680] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:03,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952758476] [2022-11-03 03:49:03,713 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:49:03,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:03,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:03,714 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:03,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-03 03:49:03,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:03,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 1015 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-03 03:49:03,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:07,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:07,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:10,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:10,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952758476] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:49:10,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1467966472] [2022-11-03 03:49:10,465 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:49:10,465 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:49:10,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:49:10,465 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:49:10,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:49:10,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:49:11,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81324#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:49:11,599 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:49:11,599 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:49:11,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 139 [2022-11-03 03:49:11,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638673250] [2022-11-03 03:49:11,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:11,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-03 03:49:11,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:49:11,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-03 03:49:11,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4445, Invalid=17311, Unknown=0, NotChecked=0, Total=21756 [2022-11-03 03:49:11,602 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:14,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:14,376 INFO L93 Difference]: Finished difference Result 595 states and 643 transitions. [2022-11-03 03:49:14,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-03 03:49:14,376 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 274 [2022-11-03 03:49:14,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:14,377 INFO L225 Difference]: With dead ends: 595 [2022-11-03 03:49:14,377 INFO L226 Difference]: Without dead ends: 412 [2022-11-03 03:49:14,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 678 SyntacticMatches, 88 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14170 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=8587, Invalid=28469, Unknown=0, NotChecked=0, Total=37056 [2022-11-03 03:49:14,380 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 389 mSDsluCounter, 1038 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 312 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 1130 SdHoareTripleChecker+Invalid, 1496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 312 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:14,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 1130 Invalid, 1496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [312 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:49:14,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-11-03 03:49:14,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 277. [2022-11-03 03:49:14,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.0108695652173914) internal successors, (279), 276 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) [2022-11-03 03:49:14,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 279 transitions. [2022-11-03 03:49:14,424 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 279 transitions. Word has length 274 [2022-11-03 03:49:14,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:14,424 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 279 transitions. [2022-11-03 03:49:14,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:14,425 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 279 transitions. [2022-11-03 03:49:14,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2022-11-03 03:49:14,426 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:14,427 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:49:14,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-11-03 03:49:14,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:14,643 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:49:14,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:14,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1643981899, now seen corresponding path program 50 times [2022-11-03 03:49:14,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:49:14,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519839344] [2022-11-03 03:49:14,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:49:14,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:49:14,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:17,057 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 1980 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:17,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:49:17,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519839344] [2022-11-03 03:49:17,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519839344] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:17,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533276479] [2022-11-03 03:49:17,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:49:17,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:17,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:17,062 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:17,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-03 03:49:17,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2022-11-03 03:49:17,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:17,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-03 03:49:17,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:17,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:17,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:19,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:19,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533276479] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:49:19,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761272147] [2022-11-03 03:49:19,741 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:49:19,741 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:49:19,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:49:19,741 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:49:19,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:49:19,839 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:49:20,377 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84404#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:49:20,377 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:49:20,377 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:49:20,377 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 51 [2022-11-03 03:49:20,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118595987] [2022-11-03 03:49:20,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:20,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-03 03:49:20,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:49:20,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-03 03:49:20,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1228, Invalid=2432, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 03:49:20,379 INFO L87 Difference]: Start difference. First operand 277 states and 279 transitions. Second operand has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:21,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:21,613 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2022-11-03 03:49:21,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-03 03:49:21,613 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 276 [2022-11-03 03:49:21,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:21,614 INFO L225 Difference]: With dead ends: 294 [2022-11-03 03:49:21,614 INFO L226 Difference]: Without dead ends: 292 [2022-11-03 03:49:21,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 770 SyntacticMatches, 89 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5501 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3681, Invalid=8091, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 03:49:21,616 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 288 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:21,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 403 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:49:21,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-11-03 03:49:21,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 285. [2022-11-03 03:49:21,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.0105633802816902) internal successors, (287), 284 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:21,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 287 transitions. [2022-11-03 03:49:21,673 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 287 transitions. Word has length 276 [2022-11-03 03:49:21,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:21,673 INFO L495 AbstractCegarLoop]: Abstraction has 285 states and 287 transitions. [2022-11-03 03:49:21,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:21,674 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 287 transitions. [2022-11-03 03:49:21,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2022-11-03 03:49:21,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:21,675 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:49:21,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:21,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-11-03 03:49:21,879 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:49:21,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:21,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1638834331, now seen corresponding path program 51 times [2022-11-03 03:49:21,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:49:21,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627960735] [2022-11-03 03:49:21,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:49:21,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:49:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:26,159 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4097 proven. 2205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:26,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:49:26,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627960735] [2022-11-03 03:49:26,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627960735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:26,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685863205] [2022-11-03 03:49:26,159 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:49:26,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:26,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:26,160 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:26,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-03 03:49:26,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:49:26,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:26,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 95 conjunts are in the unsatisfiable core [2022-11-03 03:49:26,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:30,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4232 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:30,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4232 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:33,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685863205] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:49:33,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1620282628] [2022-11-03 03:49:33,364 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:49:33,364 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:49:33,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:49:33,364 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:49:33,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:49:33,465 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:49:34,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '87215#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:49:34,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:49:34,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:49:34,506 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 146 [2022-11-03 03:49:34,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120986893] [2022-11-03 03:49:34,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:34,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2022-11-03 03:49:34,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:49:34,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2022-11-03 03:49:34,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4926, Invalid=18944, Unknown=0, NotChecked=0, Total=23870 [2022-11-03 03:49:34,509 INFO L87 Difference]: Start difference. First operand 285 states and 287 transitions. Second operand has 146 states, 146 states have (on average 3.3219178082191783) internal successors, (485), 146 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:39,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:39,407 INFO L93 Difference]: Finished difference Result 804 states and 855 transitions. [2022-11-03 03:49:39,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2022-11-03 03:49:39,408 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.3219178082191783) internal successors, (485), 146 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 284 [2022-11-03 03:49:39,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:39,409 INFO L225 Difference]: With dead ends: 804 [2022-11-03 03:49:39,409 INFO L226 Difference]: Without dead ends: 430 [2022-11-03 03:49:39,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1038 GetRequests, 703 SyntacticMatches, 89 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21042 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=13902, Invalid=47354, Unknown=0, NotChecked=0, Total=61256 [2022-11-03 03:49:39,412 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 582 mSDsluCounter, 1534 mSDsCounter, 0 mSdLazyCounter, 1682 mSolverCounterSat, 490 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 582 SdHoareTripleChecker+Valid, 1628 SdHoareTripleChecker+Invalid, 2172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 490 IncrementalHoareTripleChecker+Valid, 1682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:39,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [582 Valid, 1628 Invalid, 2172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [490 Valid, 1682 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:49:39,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-11-03 03:49:39,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 289. [2022-11-03 03:49:39,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 288 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:39,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 291 transitions. [2022-11-03 03:49:39,453 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 291 transitions. Word has length 284 [2022-11-03 03:49:39,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:39,453 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 291 transitions. [2022-11-03 03:49:39,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.3219178082191783) internal successors, (485), 146 states have internal predecessors, (485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:39,453 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 291 transitions. [2022-11-03 03:49:39,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2022-11-03 03:49:39,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:39,454 INFO L195 NwaCegarLoop]: trace histogram [48, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:49:39,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:39,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:39,655 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:49:39,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:39,655 INFO L85 PathProgramCache]: Analyzing trace with hash 143078181, now seen corresponding path program 52 times [2022-11-03 03:49:39,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:49:39,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982339745] [2022-11-03 03:49:39,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:49:39,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:49:39,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:42,351 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2162 proven. 4326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:42,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:49:42,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982339745] [2022-11-03 03:49:42,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982339745] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:42,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631672095] [2022-11-03 03:49:42,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:49:42,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:42,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:42,353 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:42,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-03 03:49:42,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:42,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-03 03:49:42,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:42,882 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:42,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:44,940 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:44,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631672095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:49:44,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149595342] [2022-11-03 03:49:44,943 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:49:44,943 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:49:44,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:49:44,943 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:49:44,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:49:45,030 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:49:45,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90795#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:49:45,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:49:45,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:49:45,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 53 [2022-11-03 03:49:45,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071793971] [2022-11-03 03:49:45,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:45,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-03 03:49:45,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:49:45,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-03 03:49:45,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=2579, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 03:49:45,585 INFO L87 Difference]: Start difference. First operand 289 states and 291 transitions. Second operand has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:46,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:46,892 INFO L93 Difference]: Finished difference Result 306 states and 309 transitions. [2022-11-03 03:49:46,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-03 03:49:46,892 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 288 [2022-11-03 03:49:46,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:46,894 INFO L225 Difference]: With dead ends: 306 [2022-11-03 03:49:46,894 INFO L226 Difference]: Without dead ends: 304 [2022-11-03 03:49:46,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 804 SyntacticMatches, 93 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5931 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=3982, Invalid=8674, Unknown=0, NotChecked=0, Total=12656 [2022-11-03 03:49:46,896 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 306 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:46,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 396 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:49:46,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-03 03:49:46,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 297. [2022-11-03 03:49:46,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.010135135135135) internal successors, (299), 296 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:46,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 299 transitions. [2022-11-03 03:49:46,967 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 299 transitions. Word has length 288 [2022-11-03 03:49:46,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:46,967 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 299 transitions. [2022-11-03 03:49:46,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:49:46,968 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 299 transitions. [2022-11-03 03:49:46,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2022-11-03 03:49:46,969 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:46,969 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:49:47,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:47,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-03 03:49:47,183 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:49:47,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:47,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1263833099, now seen corresponding path program 53 times [2022-11-03 03:49:47,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:49:47,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809403314] [2022-11-03 03:49:47,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:49:47,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:49:47,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:49:51,899 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4467 proven. 2397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:51,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:49:51,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809403314] [2022-11-03 03:49:51,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809403314] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:51,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702221891] [2022-11-03 03:49:51,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:49:51,900 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:51,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:51,900 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:51,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-03 03:49:52,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2022-11-03 03:49:52,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:52,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-03 03:49:52,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:56,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4608 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:56,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4608 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:49:59,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702221891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:49:59,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1643716853] [2022-11-03 03:49:59,774 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:49:59,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:49:59,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:49:59,775 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:49:59,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:49:59,873 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:50:00,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '93724#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:50:00,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:50:00,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:50:00,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 152 [2022-11-03 03:50:00,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752325350] [2022-11-03 03:50:00,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:50:00,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2022-11-03 03:50:00,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:00,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2022-11-03 03:50:00,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5330, Invalid=20430, Unknown=0, NotChecked=0, Total=25760 [2022-11-03 03:50:00,948 INFO L87 Difference]: Start difference. First operand 297 states and 299 transitions. Second operand has 152 states, 152 states have (on average 3.3223684210526314) internal successors, (505), 152 states have internal predecessors, (505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:06,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:06,265 INFO L93 Difference]: Finished difference Result 838 states and 891 transitions. [2022-11-03 03:50:06,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2022-11-03 03:50:06,265 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 3.3223684210526314) internal successors, (505), 152 states have internal predecessors, (505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 296 [2022-11-03 03:50:06,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:06,266 INFO L225 Difference]: With dead ends: 838 [2022-11-03 03:50:06,266 INFO L226 Difference]: Without dead ends: 448 [2022-11-03 03:50:06,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1082 GetRequests, 733 SyntacticMatches, 93 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22771 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=15080, Invalid=51226, Unknown=0, NotChecked=0, Total=66306 [2022-11-03 03:50:06,270 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 689 mSDsluCounter, 1589 mSDsCounter, 0 mSdLazyCounter, 1748 mSolverCounterSat, 349 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 689 SdHoareTripleChecker+Valid, 1687 SdHoareTripleChecker+Invalid, 2097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 349 IncrementalHoareTripleChecker+Valid, 1748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:06,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [689 Valid, 1687 Invalid, 2097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [349 Valid, 1748 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:50:06,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-11-03 03:50:06,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 301. [2022-11-03 03:50:06,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 300 states have (on average 1.01) internal successors, (303), 300 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:06,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 303 transitions. [2022-11-03 03:50:06,335 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 303 transitions. Word has length 296 [2022-11-03 03:50:06,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:06,335 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 303 transitions. [2022-11-03 03:50:06,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 3.3223684210526314) internal successors, (505), 152 states have internal predecessors, (505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:06,335 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 303 transitions. [2022-11-03 03:50:06,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2022-11-03 03:50:06,337 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:06,337 INFO L195 NwaCegarLoop]: trace histogram [50, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:06,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:06,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-11-03 03:50:06,551 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:06,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:06,551 INFO L85 PathProgramCache]: Analyzing trace with hash -1165778027, now seen corresponding path program 54 times [2022-11-03 03:50:06,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:06,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152733229] [2022-11-03 03:50:06,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:06,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:06,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2352 proven. 4706 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:09,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:09,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152733229] [2022-11-03 03:50:09,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152733229] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:09,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60741266] [2022-11-03 03:50:09,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:50:09,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:09,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:09,456 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:09,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-03 03:50:09,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:50:09,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:09,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-03 03:50:09,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:10,040 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:10,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:12,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60741266] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:50:12,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197435147] [2022-11-03 03:50:12,290 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:50:12,290 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:50:12,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:50:12,290 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:50:12,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:50:12,390 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:50:12,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97454#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:50:12,953 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:50:12,954 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:50:12,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 55 [2022-11-03 03:50:12,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008726218] [2022-11-03 03:50:12,954 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:50:12,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 03:50:12,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:12,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 03:50:12,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=2730, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 03:50:12,956 INFO L87 Difference]: Start difference. First operand 301 states and 303 transitions. Second operand has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 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) [2022-11-03 03:50:14,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:14,410 INFO L93 Difference]: Finished difference Result 318 states and 321 transitions. [2022-11-03 03:50:14,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-11-03 03:50:14,411 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 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 300 [2022-11-03 03:50:14,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:14,413 INFO L225 Difference]: With dead ends: 318 [2022-11-03 03:50:14,413 INFO L226 Difference]: Without dead ends: 316 [2022-11-03 03:50:14,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 838 SyntacticMatches, 97 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6377 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4295, Invalid=9277, Unknown=0, NotChecked=0, Total=13572 [2022-11-03 03:50:14,414 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 266 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:14,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 497 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:50:14,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-11-03 03:50:14,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 309. [2022-11-03 03:50:14,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.0097402597402598) internal successors, (311), 308 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:14,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2022-11-03 03:50:14,467 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 300 [2022-11-03 03:50:14,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:14,468 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2022-11-03 03:50:14,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 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) [2022-11-03 03:50:14,468 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2022-11-03 03:50:14,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2022-11-03 03:50:14,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:14,470 INFO L195 NwaCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:14,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:14,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-03 03:50:14,683 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:14,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:14,683 INFO L85 PathProgramCache]: Analyzing trace with hash 265392251, now seen corresponding path program 55 times [2022-11-03 03:50:14,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:14,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167074299] [2022-11-03 03:50:14,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:14,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:14,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:19,728 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4853 proven. 2597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:19,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:19,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167074299] [2022-11-03 03:50:19,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167074299] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:19,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834639222] [2022-11-03 03:50:19,729 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:50:19,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:19,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:19,730 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:19,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-03 03:50:19,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:19,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-03 03:50:19,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:24,560 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:50:24,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:50:27,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834639222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:50:27,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1566776355] [2022-11-03 03:50:27,976 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:50:27,976 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:50:27,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:50:27,977 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:50:27,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:50:28,068 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:50:29,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100498#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:50:29,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:50:29,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:50:29,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 102, 102] total 155 [2022-11-03 03:50:29,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981208949] [2022-11-03 03:50:29,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:50:29,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-11-03 03:50:29,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:29,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-11-03 03:50:29,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5487, Invalid=21245, Unknown=0, NotChecked=0, Total=26732 [2022-11-03 03:50:29,164 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:32,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:32,553 INFO L93 Difference]: Finished difference Result 666 states and 719 transitions. [2022-11-03 03:50:32,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-03 03:50:32,553 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 308 [2022-11-03 03:50:32,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:32,554 INFO L225 Difference]: With dead ends: 666 [2022-11-03 03:50:32,554 INFO L226 Difference]: Without dead ends: 461 [2022-11-03 03:50:32,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 765 SyntacticMatches, 98 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17453 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=10589, Invalid=34993, Unknown=0, NotChecked=0, Total=45582 [2022-11-03 03:50:32,557 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 519 mSDsluCounter, 1167 mSDsCounter, 0 mSdLazyCounter, 1331 mSolverCounterSat, 340 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 1269 SdHoareTripleChecker+Invalid, 1671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 340 IncrementalHoareTripleChecker+Valid, 1331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:32,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 1269 Invalid, 1671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [340 Valid, 1331 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 03:50:32,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-11-03 03:50:32,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 311. [2022-11-03 03:50:32,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.0096774193548388) internal successors, (313), 310 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:32,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 313 transitions. [2022-11-03 03:50:32,603 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 313 transitions. Word has length 308 [2022-11-03 03:50:32,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:32,604 INFO L495 AbstractCegarLoop]: Abstraction has 311 states and 313 transitions. [2022-11-03 03:50:32,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:32,604 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 313 transitions. [2022-11-03 03:50:32,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2022-11-03 03:50:32,606 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:32,606 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:32,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:32,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-03 03:50:32,819 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:32,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:32,819 INFO L85 PathProgramCache]: Analyzing trace with hash -344363680, now seen corresponding path program 56 times [2022-11-03 03:50:32,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:32,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953753693] [2022-11-03 03:50:32,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:32,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:32,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 4853 proven. 2697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:38,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:38,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953753693] [2022-11-03 03:50:38,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953753693] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:38,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117590987] [2022-11-03 03:50:38,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:50:38,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:38,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:38,145 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:38,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-03 03:50:38,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2022-11-03 03:50:38,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:38,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 1147 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-03 03:50:38,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:42,023 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 2550 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:42,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:48,526 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 2550 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:48,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117590987] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:50:48,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521150445] [2022-11-03 03:50:48,527 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:50:48,527 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:50:48,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:50:48,528 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:50:48,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:50:48,617 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:50:49,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104051#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:50:49,711 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:50:49,711 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:50:49,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 53, 53] total 156 [2022-11-03 03:50:49,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289672200] [2022-11-03 03:50:49,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:50:49,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2022-11-03 03:50:49,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:49,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2022-11-03 03:50:49,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4219, Invalid=22841, Unknown=0, NotChecked=0, Total=27060 [2022-11-03 03:50:49,715 INFO L87 Difference]: Start difference. First operand 311 states and 313 transitions. Second operand has 156 states, 156 states have (on average 3.967948717948718) internal successors, (619), 156 states have internal predecessors, (619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:59,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:59,046 INFO L93 Difference]: Finished difference Result 680 states and 735 transitions. [2022-11-03 03:50:59,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2022-11-03 03:50:59,047 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 3.967948717948718) internal successors, (619), 156 states have internal predecessors, (619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 310 [2022-11-03 03:50:59,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:59,048 INFO L225 Difference]: With dead ends: 680 [2022-11-03 03:50:59,048 INFO L226 Difference]: Without dead ends: 473 [2022-11-03 03:50:59,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1287 GetRequests, 819 SyntacticMatches, 101 SemanticMatches, 367 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59606 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=20644, Invalid=115148, Unknown=0, NotChecked=0, Total=135792 [2022-11-03 03:50:59,056 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 948 mSDsluCounter, 826 mSDsCounter, 0 mSdLazyCounter, 3586 mSolverCounterSat, 1038 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 948 SdHoareTripleChecker+Valid, 879 SdHoareTripleChecker+Invalid, 4624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1038 IncrementalHoareTripleChecker+Valid, 3586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:59,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [948 Valid, 879 Invalid, 4624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1038 Valid, 3586 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-03 03:50:59,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2022-11-03 03:50:59,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 317. [2022-11-03 03:50:59,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.009493670886076) internal successors, (319), 316 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:59,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 319 transitions. [2022-11-03 03:50:59,117 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 319 transitions. Word has length 310 [2022-11-03 03:50:59,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:59,117 INFO L495 AbstractCegarLoop]: Abstraction has 317 states and 319 transitions. [2022-11-03 03:50:59,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 3.967948717948718) internal successors, (619), 156 states have internal predecessors, (619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:50:59,118 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 319 transitions. [2022-11-03 03:50:59,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2022-11-03 03:50:59,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:59,119 INFO L195 NwaCegarLoop]: trace histogram [52, 52, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:59,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:59,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-03 03:50:59,335 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:59,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:59,335 INFO L85 PathProgramCache]: Analyzing trace with hash 75680824, now seen corresponding path program 57 times [2022-11-03 03:50:59,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:59,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491640260] [2022-11-03 03:50:59,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:59,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:59,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:05,024 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5052 proven. 2802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:05,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:05,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491640260] [2022-11-03 03:51:05,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491640260] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:05,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274825157] [2022-11-03 03:51:05,025 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:51:05,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:05,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:05,026 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:05,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-03 03:51:05,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:51:05,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:05,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-03 03:51:05,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:08,871 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 2652 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:08,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:15,546 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 2652 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:15,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274825157] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:51:15,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678213628] [2022-11-03 03:51:15,547 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:51:15,547 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:51:15,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:51:15,547 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:51:15,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:51:15,637 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:51:16,751 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '108032#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:51:16,751 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:51:16,751 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:51:16,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 54, 54] total 159 [2022-11-03 03:51:16,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321785967] [2022-11-03 03:51:16,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:51:16,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2022-11-03 03:51:16,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:16,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2022-11-03 03:51:16,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4379, Invalid=23677, Unknown=0, NotChecked=0, Total=28056 [2022-11-03 03:51:16,755 INFO L87 Difference]: Start difference. First operand 317 states and 319 transitions. Second operand has 159 states, 159 states have (on average 3.9685534591194966) internal successors, (631), 159 states have internal predecessors, (631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:26,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:26,386 INFO L93 Difference]: Finished difference Result 693 states and 749 transitions. [2022-11-03 03:51:26,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 213 states. [2022-11-03 03:51:26,386 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 3.9685534591194966) internal successors, (631), 159 states have internal predecessors, (631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 316 [2022-11-03 03:51:26,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:26,388 INFO L225 Difference]: With dead ends: 693 [2022-11-03 03:51:26,388 INFO L226 Difference]: Without dead ends: 482 [2022-11-03 03:51:26,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1312 GetRequests, 835 SyntacticMatches, 103 SemanticMatches, 374 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61945 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=21438, Invalid=119562, Unknown=0, NotChecked=0, Total=141000 [2022-11-03 03:51:26,399 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 1220 mSDsluCounter, 695 mSDsCounter, 0 mSdLazyCounter, 3477 mSolverCounterSat, 1403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1220 SdHoareTripleChecker+Valid, 749 SdHoareTripleChecker+Invalid, 4880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1403 IncrementalHoareTripleChecker+Valid, 3477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:26,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1220 Valid, 749 Invalid, 4880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1403 Valid, 3477 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-03 03:51:26,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2022-11-03 03:51:26,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 323. [2022-11-03 03:51:26,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.0093167701863355) internal successors, (325), 322 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:26,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2022-11-03 03:51:26,455 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 316 [2022-11-03 03:51:26,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:26,455 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2022-11-03 03:51:26,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 3.9685534591194966) internal successors, (631), 159 states have internal predecessors, (631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:26,456 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2022-11-03 03:51:26,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2022-11-03 03:51:26,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:26,457 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:51:26,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:26,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-03 03:51:26,658 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:26,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:26,658 INFO L85 PathProgramCache]: Analyzing trace with hash -935473328, now seen corresponding path program 58 times [2022-11-03 03:51:26,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:26,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887742202] [2022-11-03 03:51:26,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:26,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:26,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:32,457 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5255 proven. 2909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:32,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:32,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887742202] [2022-11-03 03:51:32,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887742202] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:32,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831319666] [2022-11-03 03:51:32,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:51:32,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:32,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:32,458 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:32,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-03 03:51:32,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:32,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-03 03:51:32,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:37,647 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:37,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:41,405 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:41,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831319666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:51:41,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495135962] [2022-11-03 03:51:41,406 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:51:41,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:51:41,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:51:41,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:51:41,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:51:41,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:51:42,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112090#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:51:42,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:51:42,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:51:42,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 163 [2022-11-03 03:51:42,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922944327] [2022-11-03 03:51:42,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:51:42,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-03 03:51:42,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:42,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-03 03:51:42,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6077, Invalid=23335, Unknown=0, NotChecked=0, Total=29412 [2022-11-03 03:51:42,665 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:46,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:46,456 INFO L93 Difference]: Finished difference Result 699 states and 755 transitions. [2022-11-03 03:51:46,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-11-03 03:51:46,456 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 322 [2022-11-03 03:51:46,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:46,457 INFO L225 Difference]: With dead ends: 699 [2022-11-03 03:51:46,457 INFO L226 Difference]: Without dead ends: 484 [2022-11-03 03:51:46,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 798 SyntacticMatches, 104 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19234 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=11803, Invalid=38597, Unknown=0, NotChecked=0, Total=50400 [2022-11-03 03:51:46,461 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 611 mSDsluCounter, 1309 mSDsCounter, 0 mSdLazyCounter, 1479 mSolverCounterSat, 499 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 1417 SdHoareTripleChecker+Invalid, 1978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 499 IncrementalHoareTripleChecker+Valid, 1479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:46,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 1417 Invalid, 1978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [499 Valid, 1479 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 03:51:46,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-11-03 03:51:46,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 325. [2022-11-03 03:51:46,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:46,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2022-11-03 03:51:46,510 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 322 [2022-11-03 03:51:46,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:46,510 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2022-11-03 03:51:46,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:46,510 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2022-11-03 03:51:46,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2022-11-03 03:51:46,512 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:46,512 INFO L195 NwaCegarLoop]: trace histogram [54, 53, 53, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:51:46,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:46,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:46,712 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:46,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:46,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1539655819, now seen corresponding path program 59 times [2022-11-03 03:51:46,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:46,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908265581] [2022-11-03 03:51:46,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:46,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:46,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:50,147 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2756 proven. 5514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:50,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:50,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908265581] [2022-11-03 03:51:50,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908265581] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:50,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805582621] [2022-11-03 03:51:50,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:51:50,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:50,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:50,148 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:50,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-03 03:51:50,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2022-11-03 03:51:50,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:50,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-03 03:51:50,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:50,943 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:50,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:53,520 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:53,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805582621] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:51:53,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1685226917] [2022-11-03 03:51:53,521 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:51:53,522 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:51:53,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:51:53,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:51:53,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:51:53,616 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:51:54,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115706#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:51:54,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:51:54,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:51:54,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 59 [2022-11-03 03:51:54,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20485452] [2022-11-03 03:51:54,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:51:54,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-03 03:51:54,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:54,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-03 03:51:54,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1648, Invalid=3044, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 03:51:54,238 INFO L87 Difference]: Start difference. First operand 325 states and 327 transitions. Second operand has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:55,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:55,777 INFO L93 Difference]: Finished difference Result 342 states and 345 transitions. [2022-11-03 03:51:55,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-03 03:51:55,777 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 324 [2022-11-03 03:51:55,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:55,779 INFO L225 Difference]: With dead ends: 342 [2022-11-03 03:51:55,779 INFO L226 Difference]: Without dead ends: 340 [2022-11-03 03:51:55,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 906 SyntacticMatches, 105 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7317 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=4957, Invalid=10543, Unknown=0, NotChecked=0, Total=15500 [2022-11-03 03:51:55,781 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 343 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:55,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [343 Valid, 418 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:51:55,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-03 03:51:55,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 333. [2022-11-03 03:51:55,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 1.0090361445783131) internal successors, (335), 332 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) [2022-11-03 03:51:55,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 335 transitions. [2022-11-03 03:51:55,830 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 335 transitions. Word has length 324 [2022-11-03 03:51:55,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:55,831 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 335 transitions. [2022-11-03 03:51:55,831 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:51:55,831 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 335 transitions. [2022-11-03 03:51:55,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2022-11-03 03:51:55,833 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:55,833 INFO L195 NwaCegarLoop]: trace histogram [55, 54, 54, 54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:51:55,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:56,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:56,042 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:56,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:56,042 INFO L85 PathProgramCache]: Analyzing trace with hash 581354587, now seen corresponding path program 60 times [2022-11-03 03:51:56,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:56,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566431091] [2022-11-03 03:51:56,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:56,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:56,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:02,007 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5673 proven. 3021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:02,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:52:02,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566431091] [2022-11-03 03:52:02,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566431091] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:02,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055155604] [2022-11-03 03:52:02,008 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:52:02,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:02,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:02,010 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:02,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-03 03:52:02,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:52:02,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:02,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 1225 conjuncts, 111 conjunts are in the unsatisfiable core [2022-11-03 03:52:02,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5832 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:07,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5832 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:11,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055155604] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:11,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [308825717] [2022-11-03 03:52:11,536 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:52:11,536 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:52:11,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:52:11,536 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:52:11,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:52:11,625 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:52:12,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118989#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:52:12,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:52:12,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:52:12,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 170 [2022-11-03 03:52:12,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150171641] [2022-11-03 03:52:12,794 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:12,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 170 states [2022-11-03 03:52:12,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:52:12,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2022-11-03 03:52:12,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6638, Invalid=25224, Unknown=0, NotChecked=0, Total=31862 [2022-11-03 03:52:12,798 INFO L87 Difference]: Start difference. First operand 333 states and 335 transitions. Second operand has 170 states, 170 states have (on average 3.323529411764706) internal successors, (565), 170 states have internal predecessors, (565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:19,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:19,156 INFO L93 Difference]: Finished difference Result 940 states and 999 transitions. [2022-11-03 03:52:19,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2022-11-03 03:52:19,157 INFO L78 Accepts]: Start accepts. Automaton has has 170 states, 170 states have (on average 3.323529411764706) internal successors, (565), 170 states have internal predecessors, (565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 332 [2022-11-03 03:52:19,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:19,158 INFO L225 Difference]: With dead ends: 940 [2022-11-03 03:52:19,158 INFO L226 Difference]: Without dead ends: 502 [2022-11-03 03:52:19,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1214 GetRequests, 823 SyntacticMatches, 105 SemanticMatches, 286 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28366 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=18902, Invalid=63754, Unknown=0, NotChecked=0, Total=82656 [2022-11-03 03:52:19,162 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 765 mSDsluCounter, 1453 mSDsCounter, 0 mSdLazyCounter, 1634 mSolverCounterSat, 555 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 765 SdHoareTripleChecker+Valid, 1563 SdHoareTripleChecker+Invalid, 2189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 555 IncrementalHoareTripleChecker+Valid, 1634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:19,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [765 Valid, 1563 Invalid, 2189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [555 Valid, 1634 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:52:19,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-11-03 03:52:19,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 337. [2022-11-03 03:52:19,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.0089285714285714) internal successors, (339), 336 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:19,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2022-11-03 03:52:19,247 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 332 [2022-11-03 03:52:19,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:19,247 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2022-11-03 03:52:19,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 170 states, 170 states have (on average 3.323529411764706) internal successors, (565), 170 states have internal predecessors, (565), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:19,248 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2022-11-03 03:52:19,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2022-11-03 03:52:19,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:19,249 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:52:19,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:19,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:19,451 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:52:19,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:19,451 INFO L85 PathProgramCache]: Analyzing trace with hash -209691931, now seen corresponding path program 61 times [2022-11-03 03:52:19,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:52:19,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659193462] [2022-11-03 03:52:19,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:19,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:52:19,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:23,106 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 2970 proven. 5942 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:23,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:52:23,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659193462] [2022-11-03 03:52:23,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659193462] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:23,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446973635] [2022-11-03 03:52:23,107 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:52:23,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:23,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:23,108 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:23,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-03 03:52:23,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:23,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-03 03:52:23,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:23,737 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:23,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:26,487 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:26,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446973635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:26,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [385821951] [2022-11-03 03:52:26,489 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:52:26,489 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:52:26,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:52:26,489 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:52:26,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:52:26,584 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:52:27,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123169#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:52:27,182 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:52:27,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:52:27,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 61 [2022-11-03 03:52:27,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636034829] [2022-11-03 03:52:27,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:27,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-03 03:52:27,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:52:27,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-03 03:52:27,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1763, Invalid=3207, Unknown=0, NotChecked=0, Total=4970 [2022-11-03 03:52:27,185 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:28,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:28,833 INFO L93 Difference]: Finished difference Result 354 states and 357 transitions. [2022-11-03 03:52:28,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-03 03:52:28,834 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 336 [2022-11-03 03:52:28,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:28,836 INFO L225 Difference]: With dead ends: 354 [2022-11-03 03:52:28,836 INFO L226 Difference]: Without dead ends: 352 [2022-11-03 03:52:28,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 940 SyntacticMatches, 109 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7811 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5306, Invalid=11206, Unknown=0, NotChecked=0, Total=16512 [2022-11-03 03:52:28,838 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 295 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 616 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 616 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:28,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 527 Invalid, 845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 616 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:52:28,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-03 03:52:28,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 345. [2022-11-03 03:52:28,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.0087209302325582) internal successors, (347), 344 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:28,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 347 transitions. [2022-11-03 03:52:28,895 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 347 transitions. Word has length 336 [2022-11-03 03:52:28,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:28,896 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 347 transitions. [2022-11-03 03:52:28,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:28,896 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 347 transitions. [2022-11-03 03:52:28,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2022-11-03 03:52:28,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:28,898 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:52:28,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:29,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-11-03 03:52:29,099 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:52:29,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:29,099 INFO L85 PathProgramCache]: Analyzing trace with hash -846596149, now seen corresponding path program 62 times [2022-11-03 03:52:29,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:52:29,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919838631] [2022-11-03 03:52:29,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:29,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:52:29,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:35,743 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6107 proven. 3245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:35,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:52:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919838631] [2022-11-03 03:52:35,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919838631] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035725042] [2022-11-03 03:52:35,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:35,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:35,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:35,745 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:35,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-03 03:52:36,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2022-11-03 03:52:36,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:36,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 1269 conjuncts, 115 conjunts are in the unsatisfiable core [2022-11-03 03:52:36,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6272 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:41,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:46,122 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6272 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:46,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035725042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:46,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1213551948] [2022-11-03 03:52:46,123 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:52:46,123 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:52:46,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:52:46,123 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:52:46,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:52:46,208 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:52:47,434 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '126570#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:52:47,435 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:52:47,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:52:47,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 176 [2022-11-03 03:52:47,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131093341] [2022-11-03 03:52:47,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:47,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-11-03 03:52:47,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:52:47,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-11-03 03:52:47,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7106, Invalid=26934, Unknown=0, NotChecked=0, Total=34040 [2022-11-03 03:52:47,440 INFO L87 Difference]: Start difference. First operand 345 states and 347 transitions. Second operand has 176 states, 176 states have (on average 3.3238636363636362) internal successors, (585), 176 states have internal predecessors, (585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:54,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:54,393 INFO L93 Difference]: Finished difference Result 974 states and 1035 transitions. [2022-11-03 03:52:54,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 172 states. [2022-11-03 03:52:54,393 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 3.3238636363636362) internal successors, (585), 176 states have internal predecessors, (585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 344 [2022-11-03 03:52:54,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:54,394 INFO L225 Difference]: With dead ends: 974 [2022-11-03 03:52:54,394 INFO L226 Difference]: Without dead ends: 520 [2022-11-03 03:52:54,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1258 GetRequests, 853 SyntacticMatches, 109 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30367 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=20272, Invalid=68234, Unknown=0, NotChecked=0, Total=88506 [2022-11-03 03:52:54,399 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 683 mSDsluCounter, 1748 mSDsCounter, 0 mSdLazyCounter, 1923 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 683 SdHoareTripleChecker+Valid, 1862 SdHoareTripleChecker+Invalid, 2270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 1923 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:54,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [683 Valid, 1862 Invalid, 2270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 1923 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 03:52:54,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-11-03 03:52:54,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 349. [2022-11-03 03:52:54,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:54,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2022-11-03 03:52:54,457 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 344 [2022-11-03 03:52:54,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:54,457 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2022-11-03 03:52:54,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 3.3238636363636362) internal successors, (585), 176 states have internal predecessors, (585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:52:54,457 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2022-11-03 03:52:54,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2022-11-03 03:52:54,459 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:54,459 INFO L195 NwaCegarLoop]: trace histogram [58, 57, 57, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:52:54,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:54,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:54,659 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:52:54,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:54,660 INFO L85 PathProgramCache]: Analyzing trace with hash 2035552085, now seen corresponding path program 63 times [2022-11-03 03:52:54,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:52:54,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775983441] [2022-11-03 03:52:54,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:54,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:52:54,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:58,740 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3192 proven. 6386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:58,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:52:58,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775983441] [2022-11-03 03:52:58,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775983441] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:58,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312952396] [2022-11-03 03:52:58,741 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:52:58,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:58,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:58,743 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:58,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-03 03:52:58,950 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:52:58,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:58,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 1289 conjuncts, 117 conjunts are in the unsatisfiable core [2022-11-03 03:52:58,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:59,391 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:52:59,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:02,311 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:02,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312952396] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:53:02,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492918820] [2022-11-03 03:53:02,312 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:53:02,312 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:53:02,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:53:02,312 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:53:02,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:53:02,407 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:53:03,054 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130900#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:53:03,054 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:53:03,055 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:53:03,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 63 [2022-11-03 03:53:03,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075826889] [2022-11-03 03:53:03,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:53:03,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-03 03:53:03,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:53:03,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-03 03:53:03,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1882, Invalid=3374, Unknown=0, NotChecked=0, Total=5256 [2022-11-03 03:53:03,058 INFO L87 Difference]: Start difference. First operand 349 states and 351 transitions. Second operand has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:04,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:53:04,815 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2022-11-03 03:53:04,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-11-03 03:53:04,815 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 348 [2022-11-03 03:53:04,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:53:04,816 INFO L225 Difference]: With dead ends: 366 [2022-11-03 03:53:04,816 INFO L226 Difference]: Without dead ends: 364 [2022-11-03 03:53:04,817 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1218 GetRequests, 974 SyntacticMatches, 113 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8321 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=5667, Invalid=11889, Unknown=0, NotChecked=0, Total=17556 [2022-11-03 03:53:04,817 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 420 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 295 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 295 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:53:04,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [420 Valid, 503 Invalid, 877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [295 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:53:04,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-11-03 03:53:04,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 357. [2022-11-03 03:53:04,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 356 states have (on average 1.0084269662921348) internal successors, (359), 356 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:04,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 359 transitions. [2022-11-03 03:53:04,875 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 359 transitions. Word has length 348 [2022-11-03 03:53:04,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:53:04,875 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 359 transitions. [2022-11-03 03:53:04,875 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:04,875 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 359 transitions. [2022-11-03 03:53:04,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2022-11-03 03:53:04,877 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:53:04,877 INFO L195 NwaCegarLoop]: trace histogram [59, 58, 58, 58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:53:04,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-11-03 03:53:05,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-11-03 03:53:05,077 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:53:05,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:53:05,078 INFO L85 PathProgramCache]: Analyzing trace with hash -866501573, now seen corresponding path program 64 times [2022-11-03 03:53:05,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:53:05,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301817828] [2022-11-03 03:53:05,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:53:05,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:53:05,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:53:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6557 proven. 3477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:12,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:53:12,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301817828] [2022-11-03 03:53:12,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301817828] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:53:12,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419556139] [2022-11-03 03:53:12,078 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:53:12,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:53:12,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:53:12,079 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:53:12,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-03 03:53:12,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:53:12,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 1313 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-03 03:53:12,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:18,220 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:53:18,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:22,697 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 03:53:22,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419556139] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:53:22,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [79689442] [2022-11-03 03:53:22,699 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:53:22,699 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:53:22,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:53:22,699 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:53:22,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:53:22,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:53:24,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134416#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:53:24,043 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:53:24,043 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:53:24,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 118, 118] total 179 [2022-11-03 03:53:24,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037677369] [2022-11-03 03:53:24,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:53:24,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2022-11-03 03:53:24,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:53:24,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2022-11-03 03:53:24,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7287, Invalid=27869, Unknown=0, NotChecked=0, Total=35156 [2022-11-03 03:53:24,048 INFO L87 Difference]: Start difference. First operand 357 states and 359 transitions. Second operand has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:28,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:53:28,632 INFO L93 Difference]: Finished difference Result 770 states and 831 transitions. [2022-11-03 03:53:28,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-03 03:53:28,632 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 356 [2022-11-03 03:53:28,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:53:28,634 INFO L225 Difference]: With dead ends: 770 [2022-11-03 03:53:28,634 INFO L226 Difference]: Without dead ends: 533 [2022-11-03 03:53:28,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 885 SyntacticMatches, 114 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23029 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=14133, Invalid=46137, Unknown=0, NotChecked=0, Total=60270 [2022-11-03 03:53:28,638 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 556 mSDsluCounter, 1362 mSDsCounter, 0 mSdLazyCounter, 1545 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 1480 SdHoareTripleChecker+Invalid, 2091 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 1545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:53:28,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [556 Valid, 1480 Invalid, 2091 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [546 Valid, 1545 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:53:28,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-03 03:53:28,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 359. [2022-11-03 03:53:28,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 358 states have (on average 1.0083798882681565) internal successors, (361), 358 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:28,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 361 transitions. [2022-11-03 03:53:28,699 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 361 transitions. Word has length 356 [2022-11-03 03:53:28,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:53:28,699 INFO L495 AbstractCegarLoop]: Abstraction has 359 states and 361 transitions. [2022-11-03 03:53:28,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:53:28,699 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 361 transitions. [2022-11-03 03:53:28,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2022-11-03 03:53:28,701 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:53:28,701 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 58, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:53:28,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-03 03:53:28,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-11-03 03:53:28,902 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:53:28,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:53:28,902 INFO L85 PathProgramCache]: Analyzing trace with hash -193930464, now seen corresponding path program 65 times [2022-11-03 03:53:28,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:53:28,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652326830] [2022-11-03 03:53:28,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:53:28,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:53:29,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:53:36,009 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6557 proven. 3593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:36,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:53:36,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652326830] [2022-11-03 03:53:36,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652326830] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:53:36,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871955635] [2022-11-03 03:53:36,009 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:53:36,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:53:36,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:53:36,010 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:53:36,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-03 03:53:36,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2022-11-03 03:53:36,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:36,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 1323 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-03 03:53:36,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:41,225 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 3422 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:41,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 3422 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:53:49,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871955635] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:53:49,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [679648972] [2022-11-03 03:53:49,946 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:53:49,946 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:53:49,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:53:49,946 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:53:49,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:53:50,033 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:53:51,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138521#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:53:51,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:53:51,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:53:51,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 61, 61] total 180 [2022-11-03 03:53:51,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647561859] [2022-11-03 03:53:51,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:53:51,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 180 states [2022-11-03 03:53:51,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:53:51,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2022-11-03 03:53:51,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5583, Invalid=29949, Unknown=0, NotChecked=0, Total=35532 [2022-11-03 03:53:51,365 INFO L87 Difference]: Start difference. First operand 359 states and 361 transitions. Second operand has 180 states, 180 states have (on average 3.9722222222222223) internal successors, (715), 180 states have internal predecessors, (715), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:03,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:03,903 INFO L93 Difference]: Finished difference Result 784 states and 847 transitions. [2022-11-03 03:54:03,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 241 states. [2022-11-03 03:54:03,904 INFO L78 Accepts]: Start accepts. Automaton has has 180 states, 180 states have (on average 3.9722222222222223) internal successors, (715), 180 states have internal predecessors, (715), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 358 [2022-11-03 03:54:03,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:03,905 INFO L225 Difference]: With dead ends: 784 [2022-11-03 03:54:03,905 INFO L226 Difference]: Without dead ends: 545 [2022-11-03 03:54:03,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1487 GetRequests, 947 SyntacticMatches, 117 SemanticMatches, 423 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79578 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=27416, Invalid=152784, Unknown=0, NotChecked=0, Total=180200 [2022-11-03 03:54:03,916 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 1148 mSDsluCounter, 926 mSDsCounter, 0 mSdLazyCounter, 3919 mSolverCounterSat, 1159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1148 SdHoareTripleChecker+Valid, 987 SdHoareTripleChecker+Invalid, 5078 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1159 IncrementalHoareTripleChecker+Valid, 3919 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:03,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1148 Valid, 987 Invalid, 5078 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1159 Valid, 3919 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-03 03:54:03,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2022-11-03 03:54:03,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 365. [2022-11-03 03:54:03,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 364 states have (on average 1.0082417582417582) internal successors, (367), 364 states have internal predecessors, (367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:03,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 367 transitions. [2022-11-03 03:54:03,990 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 367 transitions. Word has length 358 [2022-11-03 03:54:03,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:03,990 INFO L495 AbstractCegarLoop]: Abstraction has 365 states and 367 transitions. [2022-11-03 03:54:03,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 180 states, 180 states have (on average 3.9722222222222223) internal successors, (715), 180 states have internal predecessors, (715), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:03,990 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 367 transitions. [2022-11-03 03:54:03,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2022-11-03 03:54:03,992 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:03,992 INFO L195 NwaCegarLoop]: trace histogram [60, 60, 59, 59, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:54:04,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-11-03 03:54:04,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-03 03:54:04,192 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:54:04,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:04,193 INFO L85 PathProgramCache]: Analyzing trace with hash -10314760, now seen corresponding path program 66 times [2022-11-03 03:54:04,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:54:04,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186414115] [2022-11-03 03:54:04,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:54:04,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:54:04,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:54:12,030 INFO L134 CoverageAnalysis]: Checked inductivity of 10502 backedges. 6788 proven. 3714 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:12,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:54:12,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186414115] [2022-11-03 03:54:12,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186414115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:12,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47671412] [2022-11-03 03:54:12,031 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:54:12,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:12,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:54:12,032 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:54:12,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-03 03:54:12,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:54:12,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:12,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-03 03:54:12,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:17,082 INFO L134 CoverageAnalysis]: Checked inductivity of 10502 backedges. 3540 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:17,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:25,958 INFO L134 CoverageAnalysis]: Checked inductivity of 10502 backedges. 3540 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:25,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47671412] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:54:25,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298486877] [2022-11-03 03:54:25,959 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:54:25,959 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:54:25,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:54:25,959 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:54:25,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:54:26,044 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:54:27,299 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '143110#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:54:27,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:54:27,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:54:27,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [122, 62, 62] total 183 [2022-11-03 03:54:27,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705074740] [2022-11-03 03:54:27,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:54:27,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 183 states [2022-11-03 03:54:27,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:54:27,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 183 interpolants. [2022-11-03 03:54:27,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5767, Invalid=30905, Unknown=0, NotChecked=0, Total=36672 [2022-11-03 03:54:27,303 INFO L87 Difference]: Start difference. First operand 365 states and 367 transitions. Second operand has 183 states, 183 states have (on average 3.9726775956284155) internal successors, (727), 183 states have internal predecessors, (727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:40,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:40,064 INFO L93 Difference]: Finished difference Result 797 states and 861 transitions. [2022-11-03 03:54:40,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 245 states. [2022-11-03 03:54:40,064 INFO L78 Accepts]: Start accepts. Automaton has has 183 states, 183 states have (on average 3.9726775956284155) internal successors, (727), 183 states have internal predecessors, (727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 364 [2022-11-03 03:54:40,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:40,066 INFO L225 Difference]: With dead ends: 797 [2022-11-03 03:54:40,066 INFO L226 Difference]: Without dead ends: 554 [2022-11-03 03:54:40,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1512 GetRequests, 963 SyntacticMatches, 119 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82277 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=28330, Invalid=157862, Unknown=0, NotChecked=0, Total=186192 [2022-11-03 03:54:40,076 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 1240 mSDsluCounter, 1014 mSDsCounter, 0 mSdLazyCounter, 4348 mSolverCounterSat, 1301 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1240 SdHoareTripleChecker+Valid, 1076 SdHoareTripleChecker+Invalid, 5649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1301 IncrementalHoareTripleChecker+Valid, 4348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:40,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1240 Valid, 1076 Invalid, 5649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1301 Valid, 4348 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-03 03:54:40,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2022-11-03 03:54:40,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 371. [2022-11-03 03:54:40,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 370 states have (on average 1.008108108108108) internal successors, (373), 370 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:40,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 373 transitions. [2022-11-03 03:54:40,168 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 373 transitions. Word has length 364 [2022-11-03 03:54:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:40,169 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 373 transitions. [2022-11-03 03:54:40,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 183 states, 183 states have (on average 3.9726775956284155) internal successors, (727), 183 states have internal predecessors, (727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:40,169 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 373 transitions. [2022-11-03 03:54:40,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-03 03:54:40,170 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:40,170 INFO L195 NwaCegarLoop]: trace histogram [61, 61, 60, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:54:40,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2022-11-03 03:54:40,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-03 03:54:40,371 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:54:40,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:40,371 INFO L85 PathProgramCache]: Analyzing trace with hash 227246352, now seen corresponding path program 67 times [2022-11-03 03:54:40,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:54:40,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420515560] [2022-11-03 03:54:40,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:54:40,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:54:40,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:54:48,464 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7023 proven. 3837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:48,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:54:48,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420515560] [2022-11-03 03:54:48,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420515560] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:48,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892368185] [2022-11-03 03:54:48,465 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:54:48,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:48,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:54:48,466 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:54:48,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-03 03:54:48,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:54:48,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 1367 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-03 03:54:48,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:55,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:55,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:00,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:00,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892368185] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:55:00,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470874188] [2022-11-03 03:55:00,892 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:55:00,892 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:55:00,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:55:00,893 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:55:00,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:55:00,993 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:55:02,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '147776#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:55:02,502 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:55:02,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:55:02,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [124, 124, 124] total 187 [2022-11-03 03:55:02,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784105147] [2022-11-03 03:55:02,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:55:02,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2022-11-03 03:55:02,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:55:02,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2022-11-03 03:55:02,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=30255, Unknown=0, NotChecked=0, Total=38220 [2022-11-03 03:55:02,506 INFO L87 Difference]: Start difference. First operand 371 states and 373 transitions. Second operand has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:08,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:55:08,437 INFO L93 Difference]: Finished difference Result 803 states and 867 transitions. [2022-11-03 03:55:08,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-03 03:55:08,437 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 370 [2022-11-03 03:55:08,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:55:08,439 INFO L225 Difference]: With dead ends: 803 [2022-11-03 03:55:08,439 INFO L226 Difference]: Without dead ends: 556 [2022-11-03 03:55:08,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1293 GetRequests, 918 SyntacticMatches, 120 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25066 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=15531, Invalid=50261, Unknown=0, NotChecked=0, Total=65792 [2022-11-03 03:55:08,443 INFO L413 NwaCegarLoop]: 124 mSDtfsCounter, 816 mSDsluCounter, 1350 mSDsCounter, 0 mSdLazyCounter, 1545 mSolverCounterSat, 753 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 816 SdHoareTripleChecker+Valid, 1474 SdHoareTripleChecker+Invalid, 2298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 753 IncrementalHoareTripleChecker+Valid, 1545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:55:08,444 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [816 Valid, 1474 Invalid, 2298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [753 Valid, 1545 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 03:55:08,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2022-11-03 03:55:08,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 373. [2022-11-03 03:55:08,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 372 states have (on average 1.0080645161290323) internal successors, (375), 372 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:08,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 375 transitions. [2022-11-03 03:55:08,522 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 375 transitions. Word has length 370 [2022-11-03 03:55:08,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:55:08,522 INFO L495 AbstractCegarLoop]: Abstraction has 373 states and 375 transitions. [2022-11-03 03:55:08,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:08,523 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 375 transitions. [2022-11-03 03:55:08,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2022-11-03 03:55:08,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:55:08,525 INFO L195 NwaCegarLoop]: trace histogram [62, 61, 61, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:55:08,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-03 03:55:08,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-11-03 03:55:08,726 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:55:08,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:55:08,726 INFO L85 PathProgramCache]: Analyzing trace with hash 603695925, now seen corresponding path program 68 times [2022-11-03 03:55:08,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:55:08,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538799425] [2022-11-03 03:55:08,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:55:08,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:55:08,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:55:14,479 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3660 proven. 7322 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:14,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:55:14,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538799425] [2022-11-03 03:55:14,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538799425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:55:14,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138765386] [2022-11-03 03:55:14,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:55:14,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:55:14,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:55:14,481 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:55:14,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-03 03:55:15,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2022-11-03 03:55:15,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:15,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 125 conjunts are in the unsatisfiable core [2022-11-03 03:55:15,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:15,678 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3782 proven. 7200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:15,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3782 proven. 7200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:19,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [138765386] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:55:19,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868556092] [2022-11-03 03:55:19,588 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:55:19,588 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:55:19,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:55:19,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:55:19,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:55:19,696 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:55:20,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '151928#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:55:20,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:55:20,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:55:20,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 67 [2022-11-03 03:55:20,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981037084] [2022-11-03 03:55:20,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:55:20,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-03 03:55:20,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:55:20,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-03 03:55:20,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2132, Invalid=3720, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 03:55:20,468 INFO L87 Difference]: Start difference. First operand 373 states and 375 transitions. Second operand has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:22,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:55:22,865 INFO L93 Difference]: Finished difference Result 390 states and 393 transitions. [2022-11-03 03:55:22,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-11-03 03:55:22,866 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 372 [2022-11-03 03:55:22,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:55:22,867 INFO L225 Difference]: With dead ends: 390 [2022-11-03 03:55:22,867 INFO L226 Difference]: Without dead ends: 388 [2022-11-03 03:55:22,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1302 GetRequests, 1042 SyntacticMatches, 121 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9389 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=6425, Invalid=13315, Unknown=0, NotChecked=0, Total=19740 [2022-11-03 03:55:22,870 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 451 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 315 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 451 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 315 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:55:22,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [451 Valid, 528 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [315 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 03:55:22,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2022-11-03 03:55:22,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 381. [2022-11-03 03:55:22,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 380 states have (on average 1.0078947368421052) internal successors, (383), 380 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:22,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 383 transitions. [2022-11-03 03:55:22,953 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 383 transitions. Word has length 372 [2022-11-03 03:55:22,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:55:22,953 INFO L495 AbstractCegarLoop]: Abstraction has 381 states and 383 transitions. [2022-11-03 03:55:22,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:55:22,954 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 383 transitions. [2022-11-03 03:55:22,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2022-11-03 03:55:22,955 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:55:22,955 INFO L195 NwaCegarLoop]: trace histogram [63, 62, 62, 62, 62, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:55:22,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-11-03 03:55:23,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable70 [2022-11-03 03:55:23,156 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:55:23,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:55:23,156 INFO L85 PathProgramCache]: Analyzing trace with hash 186120219, now seen corresponding path program 69 times [2022-11-03 03:55:23,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:55:23,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969897312] [2022-11-03 03:55:23,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:55:23,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:55:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:55:32,858 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7505 proven. 3965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:32,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:55:32,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969897312] [2022-11-03 03:55:32,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969897312] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:55:32,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058328291] [2022-11-03 03:55:32,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:55:32,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:55:32,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:55:32,861 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:55:32,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-11-03 03:55:33,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:55:33,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:33,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 127 conjunts are in the unsatisfiable core [2022-11-03 03:55:33,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:41,487 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7688 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:41,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7688 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:55:47,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058328291] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:55:47,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874904099] [2022-11-03 03:55:47,733 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:55:47,734 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:55:47,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:55:47,734 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:55:47,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:55:47,846 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:55:49,472 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155683#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 03:55:49,472 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:55:49,472 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:55:49,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 194 [2022-11-03 03:55:49,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119717591] [2022-11-03 03:55:49,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:55:49,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2022-11-03 03:55:49,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:55:49,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2022-11-03 03:55:49,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8606, Invalid=32400, Unknown=0, NotChecked=0, Total=41006 [2022-11-03 03:55:49,477 INFO L87 Difference]: Start difference. First operand 381 states and 383 transitions. Second operand has 194 states, 194 states have (on average 3.3247422680412373) internal successors, (645), 194 states have internal predecessors, (645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:56:00,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:56:00,309 INFO L93 Difference]: Finished difference Result 1076 states and 1143 transitions. [2022-11-03 03:56:00,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2022-11-03 03:56:00,309 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 194 states have (on average 3.3247422680412373) internal successors, (645), 194 states have internal predecessors, (645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 380 [2022-11-03 03:56:00,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:56:00,311 INFO L225 Difference]: With dead ends: 1076 [2022-11-03 03:56:00,311 INFO L226 Difference]: Without dead ends: 574 [2022-11-03 03:56:00,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1390 GetRequests, 943 SyntacticMatches, 121 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36778 ImplicationChecksByTransitivity, 25.7s TimeCoverageRelationStatistics Valid=24670, Invalid=82586, Unknown=0, NotChecked=0, Total=107256 [2022-11-03 03:56:00,317 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 752 mSDsluCounter, 2056 mSDsCounter, 0 mSdLazyCounter, 2258 mSolverCounterSat, 639 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 752 SdHoareTripleChecker+Valid, 2182 SdHoareTripleChecker+Invalid, 2897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 639 IncrementalHoareTripleChecker+Valid, 2258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:56:00,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [752 Valid, 2182 Invalid, 2897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [639 Valid, 2258 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-03 03:56:00,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2022-11-03 03:56:00,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 385. [2022-11-03 03:56:00,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.0078125) internal successors, (387), 384 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:56:00,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 387 transitions. [2022-11-03 03:56:00,406 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 387 transitions. Word has length 380 [2022-11-03 03:56:00,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:56:00,406 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 387 transitions. [2022-11-03 03:56:00,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 194 states have (on average 3.3247422680412373) internal successors, (645), 194 states have internal predecessors, (645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:56:00,406 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 387 transitions. [2022-11-03 03:56:00,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2022-11-03 03:56:00,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:56:00,409 INFO L195 NwaCegarLoop]: trace histogram [64, 63, 63, 62, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:56:00,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:00,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c72e946-dbec-4e27-97b9-91880e639b64/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2022-11-03 03:56:00,609 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:56:00,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:56:00,610 INFO L85 PathProgramCache]: Analyzing trace with hash -967142747, now seen corresponding path program 70 times [2022-11-03 03:56:00,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:56:00,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292139389] [2022-11-03 03:56:00,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:56:00,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:56:00,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat