./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:55:44,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:55:44,603 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:55:44,636 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:55:44,637 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:55:44,638 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:55:44,640 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:55:44,643 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:55:44,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:55:44,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:55:44,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:55:44,648 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:55:44,649 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:55:44,650 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:55:44,652 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:55:44,654 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:55:44,655 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:55:44,656 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:55:44,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:55:44,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:55:44,662 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:55:44,664 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:55:44,665 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:55:44,666 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:55:44,670 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:55:44,670 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:55:44,671 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:55:44,672 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:55:44,672 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:55:44,674 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:55:44,674 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:55:44,675 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:55:44,676 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:55:44,677 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:55:44,679 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:55:44,679 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:55:44,680 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:55:44,680 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:55:44,681 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:55:44,682 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:55:44,683 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:55:44,685 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 01:55:44,729 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:55:44,730 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:55:44,730 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:55:44,731 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:55:44,732 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:55:44,732 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:55:44,733 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:55:44,733 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:55:44,733 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:55:44,734 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:55:44,735 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:55:44,735 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:55:44,735 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:55:44,735 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:55:44,736 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:55:44,736 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:55:44,736 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:55:44,737 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:55:44,737 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 01:55:44,738 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 01:55:44,738 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:55:44,738 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:55:44,738 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 01:55:44,740 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:55:44,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:55:44,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:55:44,741 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 01:55:44,741 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 01:55:44,741 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 01:55:44,742 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:55:44,742 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 01:55:44,742 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:55:44,742 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:55:44,743 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:55:44,743 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:55:44,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:55:44,744 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:55:44,744 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:55:44,744 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:55:44,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:55:44,745 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:55:44,745 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:55:44,745 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 [2021-11-21 01:55:45,092 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:55:45,114 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:55:45,117 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:55:45,118 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:55:45,119 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:55:45,120 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2021-11-21 01:55:45,217 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/data/273883582/e104567a1e6a499ea10c934c97b8b4b2/FLAG5fbd23bf9 [2021-11-21 01:55:45,808 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:55:45,809 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2021-11-21 01:55:45,825 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/data/273883582/e104567a1e6a499ea10c934c97b8b4b2/FLAG5fbd23bf9 [2021-11-21 01:55:46,120 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/data/273883582/e104567a1e6a499ea10c934c97b8b4b2 [2021-11-21 01:55:46,124 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:55:46,126 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:55:46,130 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:55:46,130 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:55:46,134 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:55:46,135 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,137 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76ba7dc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46, skipping insertion in model container [2021-11-21 01:55:46,138 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,146 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:55:46,209 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:55:46,629 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:55:46,637 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:55:46,670 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:55:46,699 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:55:46,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46 WrapperNode [2021-11-21 01:55:46,700 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:55:46,701 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:55:46,701 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:55:46,701 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:55:46,709 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,745 INFO L137 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-21 01:55:46,746 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:55:46,746 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:55:46,747 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:55:46,747 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:55:46,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,763 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:55:46,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:55:46,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:55:46,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:55:46,772 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (1/1) ... [2021-11-21 01:55:46,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:55:46,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:46,804 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:55:46,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:55:46,852 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:55:46,854 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:55:46,854 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:55:46,855 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:55:46,855 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:55:46,855 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:55:47,009 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:55:47,011 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:55:47,178 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:55:47,235 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:55:47,236 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:55:47,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:55:47 BoogieIcfgContainer [2021-11-21 01:55:47,238 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:55:47,240 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:55:47,240 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:55:47,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:55:47,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:55:46" (1/3) ... [2021-11-21 01:55:47,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488ff0cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:55:47, skipping insertion in model container [2021-11-21 01:55:47,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:46" (2/3) ... [2021-11-21 01:55:47,248 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488ff0cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:55:47, skipping insertion in model container [2021-11-21 01:55:47,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:55:47" (3/3) ... [2021-11-21 01:55:47,249 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cmemchr-alloca-2.i [2021-11-21 01:55:47,254 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:55:47,255 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2021-11-21 01:55:47,313 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:55:47,321 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:55:47,322 INFO L340 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-11-21 01:55:47,336 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 01:55:47,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:47,346 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 01:55:47,346 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:47,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:47,353 INFO L85 PathProgramCache]: Analyzing trace with hash 107409, now seen corresponding path program 1 times [2021-11-21 01:55:47,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:47,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076382062] [2021-11-21 01:55:47,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:47,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:47,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:47,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:47,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:47,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076382062] [2021-11-21 01:55:47,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076382062] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:47,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:47,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 01:55:47,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005589154] [2021-11-21 01:55:47,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:47,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:55:47,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:47,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:55:47,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:55:47,612 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 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 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:47,657 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-21 01:55:47,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:55:47,662 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 01:55:47,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:47,670 INFO L225 Difference]: With dead ends: 16 [2021-11-21 01:55:47,670 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:55:47,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:55:47,675 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:47,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:47,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:55:47,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:55:47,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-21 01:55:47,706 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2021-11-21 01:55:47,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:47,707 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-21 01:55:47,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,707 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-21 01:55:47,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 01:55:47,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:47,708 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 01:55:47,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:55:47,708 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:47,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:47,709 INFO L85 PathProgramCache]: Analyzing trace with hash 107410, now seen corresponding path program 1 times [2021-11-21 01:55:47,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:47,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333111641] [2021-11-21 01:55:47,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:47,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:47,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:47,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:47,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:47,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333111641] [2021-11-21 01:55:47,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333111641] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:47,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:47,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:55:47,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920005673] [2021-11-21 01:55:47,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:47,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:55:47,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:47,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:55:47,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:55:47,827 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:47,879 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-21 01:55:47,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:55:47,880 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-21 01:55:47,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:47,881 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:55:47,881 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:55:47,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:55:47,883 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:47,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 33 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:47,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:55:47,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:55:47,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-21 01:55:47,888 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 3 [2021-11-21 01:55:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:47,889 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-21 01:55:47,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,889 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-21 01:55:47,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:55:47,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:47,890 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-21 01:55:47,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:55:47,891 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:47,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:47,891 INFO L85 PathProgramCache]: Analyzing trace with hash 103264033, now seen corresponding path program 1 times [2021-11-21 01:55:47,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:47,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508606573] [2021-11-21 01:55:47,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:47,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:47,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:48,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:48,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:48,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508606573] [2021-11-21 01:55:48,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508606573] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:48,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244608724] [2021-11-21 01:55:48,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:48,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:48,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:48,093 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:48,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:55:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:48,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 01:55:48,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:48,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:55:48,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:48,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:48,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:48,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244608724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:48,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [507840232] [2021-11-21 01:55:48,574 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-21 01:55:48,577 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:48,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:48,588 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:48,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:48,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:55:48,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:55:49,360 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:55:49,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:55:49,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:55:49,988 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:50,170 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:50,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:50,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2021-11-21 01:55:50,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877749751] [2021-11-21 01:55:50,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:50,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:55:50,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:50,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:55:50,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:55:50,173 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:50,265 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-21 01:55:50,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:55:50,265 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 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) Word has length 5 [2021-11-21 01:55:50,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:50,266 INFO L225 Difference]: With dead ends: 16 [2021-11-21 01:55:50,266 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:55:50,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:55:50,268 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 30 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:50,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 50 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:50,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:55:50,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-21 01:55:50,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-21 01:55:50,273 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 5 [2021-11-21 01:55:50,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:50,273 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-21 01:55:50,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,274 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-21 01:55:50,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:55:50,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:50,274 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:50,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:50,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:50,475 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:50,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:50,476 INFO L85 PathProgramCache]: Analyzing trace with hash 454047929, now seen corresponding path program 1 times [2021-11-21 01:55:50,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:50,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009001263] [2021-11-21 01:55:50,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:50,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:50,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:50,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:50,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:50,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009001263] [2021-11-21 01:55:50,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009001263] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:50,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:50,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:55:50,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156780476] [2021-11-21 01:55:50,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:50,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:55:50,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:50,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:55:50,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:55:50,582 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:50,642 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-21 01:55:50,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:55:50,643 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:55:50,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:50,644 INFO L225 Difference]: With dead ends: 16 [2021-11-21 01:55:50,644 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:55:50,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:55:50,649 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 26 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:50,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:50,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:55:50,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2021-11-21 01:55:50,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-21 01:55:50,658 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2021-11-21 01:55:50,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:50,659 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-21 01:55:50,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:50,659 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-21 01:55:50,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:55:50,660 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:50,660 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:50,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:55:50,664 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:50,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:50,665 INFO L85 PathProgramCache]: Analyzing trace with hash 454047930, now seen corresponding path program 1 times [2021-11-21 01:55:50,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:50,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012727113] [2021-11-21 01:55:50,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:50,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:50,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:50,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:50,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012727113] [2021-11-21 01:55:50,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012727113] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:50,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599437646] [2021-11-21 01:55:50,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:50,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:50,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:50,853 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:50,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:55:50,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:50,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:55:50,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:51,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:51,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:55:51,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:51,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599437646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:51,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017724164] [2021-11-21 01:55:51,085 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:55:51,085 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:51,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:51,086 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:51,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:51,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:55:51,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:55:51,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:55:51,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:55:52,368 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:52,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:52,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:52,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 8 [2021-11-21 01:55:52,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176057816] [2021-11-21 01:55:52,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:52,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:55:52,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:52,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:55:52,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:55:52,808 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:52,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:52,955 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-11-21 01:55:52,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:55:52,956 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:55:52,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:52,956 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:55:52,957 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:55:52,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:55:52,958 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 61 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:52,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 33 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:55:52,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:55:52,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-21 01:55:52,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:52,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-21 01:55:52,961 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2021-11-21 01:55:52,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:52,962 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-21 01:55:52,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:52,962 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-21 01:55:52,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:55:52,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:52,963 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:52,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:53,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:53,173 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:53,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:53,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1191320785, now seen corresponding path program 1 times [2021-11-21 01:55:53,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:53,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380146833] [2021-11-21 01:55:53,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:53,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:53,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:53,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:53,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:53,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380146833] [2021-11-21 01:55:53,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380146833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:53,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737118698] [2021-11-21 01:55:53,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:53,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:53,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:53,287 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:53,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:55:53,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:53,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:55:53,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:53,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:55:53,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:55:53,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737118698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:53,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:55:53,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 7 [2021-11-21 01:55:53,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298828807] [2021-11-21 01:55:53,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:53,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:55:53,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:53,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:55:53,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:55:53,441 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:53,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:53,454 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2021-11-21 01:55:53,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:55:53,454 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:55:53,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:53,456 INFO L225 Difference]: With dead ends: 15 [2021-11-21 01:55:53,456 INFO L226 Difference]: Without dead ends: 12 [2021-11-21 01:55:53,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:55:53,458 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 5 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:53,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 5 Unchecked, 0.0s Time] [2021-11-21 01:55:53,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-21 01:55:53,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-21 01:55:53,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:53,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-21 01:55:53,462 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-11-21 01:55:53,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:53,462 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-21 01:55:53,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:53,463 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-21 01:55:53,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:55:53,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:53,464 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:53,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:53,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:53,674 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:55:53,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:53,674 INFO L85 PathProgramCache]: Analyzing trace with hash 846637802, now seen corresponding path program 1 times [2021-11-21 01:55:53,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:53,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100202988] [2021-11-21 01:55:53,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:53,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:53,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:53,805 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:53,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:53,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100202988] [2021-11-21 01:55:53,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100202988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:53,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131096731] [2021-11-21 01:55:53,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:53,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:53,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:53,813 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:53,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:55:53,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:53,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:55:53,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:53,955 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:53,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:54,071 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:54,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131096731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:54,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [697160943] [2021-11-21 01:55:54,074 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:55:54,074 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:54,074 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:54,075 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:54,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:54,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:55:54,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:55:54,617 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:55:54,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:55:54,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:55:59,288 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:00,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:00,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:00,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 01:56:00,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421321439] [2021-11-21 01:56:00,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:00,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:56:00,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:00,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:56:00,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:56:00,365 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:00,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:00,445 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-11-21 01:56:00,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:56:00,445 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-21 01:56:00,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:00,446 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:56:00,446 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:56:00,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-11-21 01:56:00,447 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 17 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:00,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 24 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:56:00,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:56:00,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-11-21 01:56:00,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:00,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-21 01:56:00,451 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-11-21 01:56:00,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:00,451 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-21 01:56:00,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:00,451 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-21 01:56:00,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:56:00,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:00,452 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:00,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:00,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:00,665 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:00,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:00,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1973139321, now seen corresponding path program 2 times [2021-11-21 01:56:00,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:00,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590687564] [2021-11-21 01:56:00,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:00,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:00,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:00,846 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:00,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:00,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590687564] [2021-11-21 01:56:00,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590687564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:00,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865450071] [2021-11-21 01:56:00,847 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:00,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:00,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:00,848 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:00,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:56:00,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:56:00,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:00,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-21 01:56:00,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:56:01,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:01,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-21 01:56:01,531 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:56:01,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865450071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:01,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383874037] [2021-11-21 01:56:01,533 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:01,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:01,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:01,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:01,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:01,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:01,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:02,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:56:02,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:05,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:07,066 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:07,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:07,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 24 [2021-11-21 01:56:07,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316402224] [2021-11-21 01:56:07,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:07,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:56:07,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:07,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:56:07,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1021, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:56:07,068 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:07,668 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-21 01:56:07,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:56:07,669 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 01:56:07,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:07,669 INFO L225 Difference]: With dead ends: 19 [2021-11-21 01:56:07,669 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 01:56:07,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=281, Invalid=1789, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:56:07,671 INFO L933 BasicCegarLoop]: 0 mSDtfsCounter, 58 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:07,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 1 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:56:07,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 01:56:07,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-11-21 01:56:07,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-21 01:56:07,675 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-11-21 01:56:07,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:07,675 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-21 01:56:07,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:07,676 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-21 01:56:07,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:56:07,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:07,676 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 01:56:07,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:07,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:07,877 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:07,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:07,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1234612777, now seen corresponding path program 3 times [2021-11-21 01:56:07,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:07,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318586971] [2021-11-21 01:56:07,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:07,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:07,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:08,037 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:08,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:08,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318586971] [2021-11-21 01:56:08,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318586971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:08,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161425652] [2021-11-21 01:56:08,039 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:56:08,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:08,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:08,040 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:08,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:56:08,205 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:56:08,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:08,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:56:08,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:08,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:08,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 01:56:08,365 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:08,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:08,534 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:08,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161425652] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:08,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1760779424] [2021-11-21 01:56:08,537 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:08,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:08,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:08,537 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:08,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:08,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:08,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:56:08,993 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:08,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:56:09,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:13,511 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:14,687 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:14,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:14,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 17 [2021-11-21 01:56:14,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569026580] [2021-11-21 01:56:14,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:14,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-21 01:56:14,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:14,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-21 01:56:14,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-11-21 01:56:14,689 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:14,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:14,893 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-21 01:56:14,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:56:14,893 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 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) Word has length 17 [2021-11-21 01:56:14,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:14,894 INFO L225 Difference]: With dead ends: 30 [2021-11-21 01:56:14,894 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:56:14,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:56:14,895 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 22 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:14,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 53 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:56:14,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:56:14,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-11-21 01:56:14,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:14,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-21 01:56:14,899 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-11-21 01:56:14,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:14,899 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-21 01:56:14,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:14,900 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-21 01:56:14,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:56:14,900 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:14,901 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 01:56:14,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:15,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:56:15,105 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:15,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:15,105 INFO L85 PathProgramCache]: Analyzing trace with hash 878565240, now seen corresponding path program 4 times [2021-11-21 01:56:15,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:15,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168718291] [2021-11-21 01:56:15,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:15,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:15,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:15,271 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:15,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:15,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168718291] [2021-11-21 01:56:15,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168718291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:15,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742523210] [2021-11-21 01:56:15,272 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:56:15,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:15,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:15,277 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:15,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:56:15,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:15,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 01:56:15,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:15,485 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:15,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:15,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:56:15,699 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:15,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742523210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:15,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1794584201] [2021-11-21 01:56:15,701 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:15,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:15,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:15,702 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:15,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:15,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:15,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:56:16,158 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:16,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:56:16,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:20,373 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:21,510 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:21,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:21,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 22 [2021-11-21 01:56:21,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783480280] [2021-11-21 01:56:21,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:21,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:56:21,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:21,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:56:21,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=894, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:56:21,512 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:21,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:21,886 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-11-21 01:56:21,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:56:21,886 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-21 01:56:21,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:21,887 INFO L225 Difference]: With dead ends: 25 [2021-11-21 01:56:21,887 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:56:21,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:56:21,889 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 125 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:21,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 16 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:56:21,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:56:21,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-11-21 01:56:21,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:21,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-21 01:56:21,893 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2021-11-21 01:56:21,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:21,894 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-21 01:56:21,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:21,894 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-21 01:56:21,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 01:56:21,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:21,895 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-21 01:56:21,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:22,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:56:22,110 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:22,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:22,111 INFO L85 PathProgramCache]: Analyzing trace with hash -1707427160, now seen corresponding path program 5 times [2021-11-21 01:56:22,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:22,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890734637] [2021-11-21 01:56:22,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:22,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:22,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:22,247 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:22,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:22,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890734637] [2021-11-21 01:56:22,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890734637] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:22,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278218026] [2021-11-21 01:56:22,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:22,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:22,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:22,249 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:22,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:56:22,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:56:22,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:22,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:56:22,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:22,585 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:22,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:22,846 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:22,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278218026] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:22,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815829446] [2021-11-21 01:56:22,848 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:22,848 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:22,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:22,848 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:22,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:22,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:23,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:56:23,318 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:23,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:56:23,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:27,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:28,381 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:28,381 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:28,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2021-11-21 01:56:28,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012087037] [2021-11-21 01:56:28,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:28,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:56:28,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:28,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:56:28,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:56:28,384 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:28,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:28,641 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-11-21 01:56:28,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:56:28,642 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-21 01:56:28,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:28,642 INFO L225 Difference]: With dead ends: 40 [2021-11-21 01:56:28,643 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:56:28,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1134, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:56:28,644 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:28,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 135 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:56:28,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:56:28,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-11-21 01:56:28,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:28,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-21 01:56:28,648 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2021-11-21 01:56:28,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:28,648 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-21 01:56:28,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:28,649 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-21 01:56:28,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:56:28,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:28,650 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2021-11-21 01:56:28,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:28,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:28,866 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:28,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:28,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1386321737, now seen corresponding path program 6 times [2021-11-21 01:56:28,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:28,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312893613] [2021-11-21 01:56:28,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:28,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:28,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:29,034 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:29,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:29,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312893613] [2021-11-21 01:56:29,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312893613] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:29,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323004740] [2021-11-21 01:56:29,035 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:56:29,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:29,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:29,035 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:29,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:56:29,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:56:29,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:29,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:56:29,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:29,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:29,452 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 9 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:29,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:29,874 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:29,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323004740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:29,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135487384] [2021-11-21 01:56:29,876 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:29,876 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:29,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:29,876 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:29,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:29,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:30,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:30,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:30,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:56:30,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:33,790 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:34,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:34,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:34,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2021-11-21 01:56:34,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254276609] [2021-11-21 01:56:34,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:34,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:56:34,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:34,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:56:34,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1881, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 01:56:34,905 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:35,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:35,490 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-11-21 01:56:35,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:56:35,490 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-21 01:56:35,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:35,491 INFO L225 Difference]: With dead ends: 31 [2021-11-21 01:56:35,491 INFO L226 Difference]: Without dead ends: 31 [2021-11-21 01:56:35,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=484, Invalid=2822, Unknown=0, NotChecked=0, Total=3306 [2021-11-21 01:56:35,492 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 152 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:35,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 24 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:56:35,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-21 01:56:35,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-11-21 01:56:35,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:35,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-11-21 01:56:35,496 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2021-11-21 01:56:35,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:35,497 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-11-21 01:56:35,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.027027027027027) internal successors, (75), 37 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:35,499 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-11-21 01:56:35,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 01:56:35,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:35,500 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-21 01:56:35,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:35,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:35,713 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:35,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1845324697, now seen corresponding path program 7 times [2021-11-21 01:56:35,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:35,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916483374] [2021-11-21 01:56:35,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:35,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:35,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:35,914 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:35,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:35,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916483374] [2021-11-21 01:56:35,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916483374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:35,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993855049] [2021-11-21 01:56:35,915 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:56:35,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:35,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:35,917 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:35,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:56:36,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:36,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:56:36,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:36,298 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:36,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:36,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993855049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:36,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713937733] [2021-11-21 01:56:36,656 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:36,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:36,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:36,657 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:36,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:36,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:36,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:37,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:37,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:56:37,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:40,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:41,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:41,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:41,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2021-11-21 01:56:41,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057229400] [2021-11-21 01:56:41,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:41,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:56:41,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:41,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:56:41,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 01:56:41,870 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:42,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:42,245 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2021-11-21 01:56:42,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:56:42,246 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 01:56:42,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:42,246 INFO L225 Difference]: With dead ends: 50 [2021-11-21 01:56:42,247 INFO L226 Difference]: Without dead ends: 33 [2021-11-21 01:56:42,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=148, Invalid=1574, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 01:56:42,248 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:42,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 209 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:56:42,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-21 01:56:42,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-11-21 01:56:42,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:42,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-21 01:56:42,252 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2021-11-21 01:56:42,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:42,252 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-21 01:56:42,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:42,252 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-21 01:56:42,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-21 01:56:42,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:42,253 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2021-11-21 01:56:42,284 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-21 01:56:42,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:56:42,469 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:42,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:42,469 INFO L85 PathProgramCache]: Analyzing trace with hash 346635062, now seen corresponding path program 8 times [2021-11-21 01:56:42,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:42,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303425684] [2021-11-21 01:56:42,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:42,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:42,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:42,715 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:42,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:42,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303425684] [2021-11-21 01:56:42,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303425684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:42,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070397415] [2021-11-21 01:56:42,716 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:42,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:42,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:42,717 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:42,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:56:42,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:56:42,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:42,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-21 01:56:42,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:42,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:43,455 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 5 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 01:56:43,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:44,524 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:56:44,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070397415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:44,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417206803] [2021-11-21 01:56:44,526 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:44,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:44,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:44,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:44,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:44,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:44,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:56:44,944 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:44,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:56:45,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:49,427 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:50,970 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:50,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:50,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 16] total 44 [2021-11-21 01:56:50,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413362830] [2021-11-21 01:56:50,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:50,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 01:56:50,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:50,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 01:56:50,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2624, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:56:50,974 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:53,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:53,451 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-11-21 01:56:53,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 01:56:53,452 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 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 31 [2021-11-21 01:56:53,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:53,453 INFO L225 Difference]: With dead ends: 52 [2021-11-21 01:56:53,453 INFO L226 Difference]: Without dead ends: 52 [2021-11-21 01:56:53,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1134, Invalid=6176, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 01:56:53,456 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 160 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:53,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 48 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:56:53,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-21 01:56:53,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-21 01:56:53,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:53,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-11-21 01:56:53,463 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 31 [2021-11-21 01:56:53,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:53,466 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-11-21 01:56:53,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:53,466 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-11-21 01:56:53,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-21 01:56:53,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:53,476 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 5, 5, 1, 1, 1, 1] [2021-11-21 01:56:53,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:53,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:56:53,698 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:56:53,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:53,699 INFO L85 PathProgramCache]: Analyzing trace with hash 380989478, now seen corresponding path program 9 times [2021-11-21 01:56:53,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:53,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723581627] [2021-11-21 01:56:53,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:53,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:53,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:53,989 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:56:53,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:53,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723581627] [2021-11-21 01:56:53,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723581627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:53,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771898187] [2021-11-21 01:56:53,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:56:53,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:53,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:54,000 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:54,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:56:54,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:56:54,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:54,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 01:56:54,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:54,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:56:54,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:54,864 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:56:54,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771898187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:54,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578312588] [2021-11-21 01:56:54,866 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:56:54,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:54,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:54,867 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:54,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:54,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:56:55,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:56:55,256 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:56:55,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:56:55,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:56:59,608 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:00,748 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:00,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:00,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 35 [2021-11-21 01:57:00,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364637567] [2021-11-21 01:57:00,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:00,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 01:57:00,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:00,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 01:57:00,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1630, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:57:00,751 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 35 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:01,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:01,061 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-21 01:57:01,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:57:01,061 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 35 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) Word has length 51 [2021-11-21 01:57:01,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:01,062 INFO L225 Difference]: With dead ends: 78 [2021-11-21 01:57:01,062 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 01:57:01,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 123 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=442, Invalid=2210, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:57:01,064 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 29 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:01,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 49 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:57:01,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 01:57:01,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-21 01:57:01,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:01,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-21 01:57:01,070 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2021-11-21 01:57:01,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:01,070 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-21 01:57:01,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 35 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:01,071 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-21 01:57:01,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-21 01:57:01,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:01,072 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 6, 6, 1, 1, 1, 1] [2021-11-21 01:57:01,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:01,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:01,277 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:01,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:01,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1604943435, now seen corresponding path program 10 times [2021-11-21 01:57:01,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:01,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298273720] [2021-11-21 01:57:01,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:01,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:01,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:01,592 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:57:01,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:01,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298273720] [2021-11-21 01:57:01,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298273720] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:01,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964059188] [2021-11-21 01:57:01,593 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:57:01,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:01,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:01,597 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:01,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:57:01,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:01,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-21 01:57:01,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:01,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:02,296 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 139 proven. 47 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:57:02,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:02,713 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 138 proven. 48 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:57:02,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964059188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:02,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503004754] [2021-11-21 01:57:02,715 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:02,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:02,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:02,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:02,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:02,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:02,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:03,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:03,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:57:03,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:07,454 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:08,791 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:08,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:08,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 42 [2021-11-21 01:57:08,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713309244] [2021-11-21 01:57:08,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:08,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-21 01:57:08,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:08,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-21 01:57:08,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=2251, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 01:57:08,795 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:09,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:09,557 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2021-11-21 01:57:09,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:57:09,557 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-21 01:57:09,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:09,558 INFO L225 Difference]: With dead ends: 84 [2021-11-21 01:57:09,558 INFO L226 Difference]: Without dead ends: 57 [2021-11-21 01:57:09,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=869, Invalid=4387, Unknown=0, NotChecked=0, Total=5256 [2021-11-21 01:57:09,561 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 60 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:09,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 64 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:57:09,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-21 01:57:09,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-21 01:57:09,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:09,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-11-21 01:57:09,567 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 53 [2021-11-21 01:57:09,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:09,567 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-11-21 01:57:09,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 42 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:09,568 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-11-21 01:57:09,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-21 01:57:09,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:09,569 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 1, 1, 1, 1] [2021-11-21 01:57:09,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:09,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:57:09,773 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:09,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:09,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1173973892, now seen corresponding path program 11 times [2021-11-21 01:57:09,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:09,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028751620] [2021-11-21 01:57:09,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:09,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:09,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:10,128 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 151 proven. 56 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:57:10,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:10,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028751620] [2021-11-21 01:57:10,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028751620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:10,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740700110] [2021-11-21 01:57:10,129 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:57:10,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:10,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:10,131 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:10,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:57:10,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-21 01:57:10,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:57:10,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 01:57:10,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:10,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:11,323 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:11,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:11,708 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:11,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740700110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:11,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511573673] [2021-11-21 01:57:11,709 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:11,709 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:11,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:11,710 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:11,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:11,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:11,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:57:12,077 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:57:12,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:57:12,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:16,142 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:17,349 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:17,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:17,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 48 [2021-11-21 01:57:17,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458374199] [2021-11-21 01:57:17,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:17,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:57:17,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:17,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:57:17,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=2728, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:57:17,352 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 49 states, 49 states have (on average 2.5306122448979593) internal successors, (124), 48 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:18,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:18,227 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2021-11-21 01:57:18,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-21 01:57:18,228 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.5306122448979593) internal successors, (124), 48 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-21 01:57:18,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:18,229 INFO L225 Difference]: With dead ends: 126 [2021-11-21 01:57:18,229 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 01:57:18,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1053, Invalid=4953, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 01:57:18,232 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 68 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:18,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 132 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:57:18,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 01:57:18,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-21 01:57:18,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:18,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-11-21 01:57:18,238 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2021-11-21 01:57:18,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:18,239 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-11-21 01:57:18,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.5306122448979593) internal successors, (124), 48 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:18,239 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-11-21 01:57:18,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 01:57:18,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:18,240 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2021-11-21 01:57:18,255 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-21 01:57:18,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:57:18,445 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:18,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:18,446 INFO L85 PathProgramCache]: Analyzing trace with hash -235632670, now seen corresponding path program 12 times [2021-11-21 01:57:18,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:18,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978866467] [2021-11-21 01:57:18,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:18,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:18,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:18,985 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:18,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:18,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978866467] [2021-11-21 01:57:18,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978866467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:18,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844231121] [2021-11-21 01:57:18,986 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:57:18,986 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:18,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:18,989 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:19,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:57:19,186 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:57:19,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:57:19,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 01:57:19,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:19,539 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:19,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:20,410 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:20,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844231121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:20,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2081163862] [2021-11-21 01:57:20,412 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:20,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:20,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:20,413 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:20,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:20,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:20,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:20,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:20,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:57:20,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:24,943 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:26,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:26,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:26,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2021-11-21 01:57:26,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113187775] [2021-11-21 01:57:26,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:26,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 01:57:26,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:26,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 01:57:26,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2715, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:57:26,407 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:27,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:27,751 INFO L93 Difference]: Finished difference Result 100 states and 101 transitions. [2021-11-21 01:57:27,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 01:57:27,751 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-21 01:57:27,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:27,752 INFO L225 Difference]: With dead ends: 100 [2021-11-21 01:57:27,752 INFO L226 Difference]: Without dead ends: 63 [2021-11-21 01:57:27,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 143 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=258, Invalid=4854, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 01:57:27,754 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 60 mSDsluCounter, 867 mSDsCounter, 0 mSdLazyCounter, 1068 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 875 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:27,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 875 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1068 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:57:27,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-21 01:57:27,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-11-21 01:57:27,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:27,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-11-21 01:57:27,759 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 59 [2021-11-21 01:57:27,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:27,759 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-11-21 01:57:27,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:27,760 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-11-21 01:57:27,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 01:57:27,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:27,760 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1] [2021-11-21 01:57:27,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-21 01:57:27,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:57:27,968 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:27,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:27,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1473340815, now seen corresponding path program 13 times [2021-11-21 01:57:27,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:27,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089190827] [2021-11-21 01:57:27,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:27,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:28,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:28,532 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 64 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:28,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:28,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089190827] [2021-11-21 01:57:28,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089190827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:28,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172065071] [2021-11-21 01:57:28,533 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:57:28,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:28,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:28,534 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:28,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:57:28,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:28,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-21 01:57:28,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:29,234 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:29,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:29,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 01:57:29,984 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:29,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172065071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:29,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105946506] [2021-11-21 01:57:29,995 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:29,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:29,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:29,997 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:29,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:30,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:30,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:30,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:30,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:57:30,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:34,853 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:36,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:36,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:36,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 50 [2021-11-21 01:57:36,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261656828] [2021-11-21 01:57:36,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:36,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-21 01:57:36,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:36,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-21 01:57:36,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=3267, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 01:57:36,363 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 52 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 51 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:38,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:38,066 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2021-11-21 01:57:38,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 01:57:38,066 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 51 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-21 01:57:38,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:38,067 INFO L225 Difference]: With dead ends: 67 [2021-11-21 01:57:38,067 INFO L226 Difference]: Without dead ends: 67 [2021-11-21 01:57:38,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1395 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1458, Invalid=7098, Unknown=0, NotChecked=0, Total=8556 [2021-11-21 01:57:38,069 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 192 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 1366 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 1431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:38,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 173 Invalid, 1431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1366 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:57:38,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-21 01:57:38,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-11-21 01:57:38,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:38,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-21 01:57:38,074 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-11-21 01:57:38,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:38,074 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-21 01:57:38,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 51 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:38,075 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-21 01:57:38,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 01:57:38,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:38,076 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2021-11-21 01:57:38,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:38,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:38,290 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:38,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:38,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1636784417, now seen corresponding path program 14 times [2021-11-21 01:57:38,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:38,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018895071] [2021-11-21 01:57:38,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:38,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:38,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:38,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:38,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018895071] [2021-11-21 01:57:38,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018895071] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:38,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451478881] [2021-11-21 01:57:38,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:57:38,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:38,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:38,804 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:38,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:57:39,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-21 01:57:39,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:57:39,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 01:57:39,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:39,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:39,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 01:57:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:39,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:41,001 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:41,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451478881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:41,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [457236640] [2021-11-21 01:57:41,003 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:41,003 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:41,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:41,003 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:41,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:41,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:41,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:41,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:41,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:57:41,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:45,329 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:46,909 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:46,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:46,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 57 [2021-11-21 01:57:46,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448458396] [2021-11-21 01:57:46,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:46,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-21 01:57:46,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:46,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-21 01:57:46,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4114, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 01:57:46,912 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:49,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:49,484 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2021-11-21 01:57:49,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 01:57:49,485 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 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 65 [2021-11-21 01:57:49,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:49,485 INFO L225 Difference]: With dead ends: 110 [2021-11-21 01:57:49,485 INFO L226 Difference]: Without dead ends: 69 [2021-11-21 01:57:49,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1412 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=415, Invalid=7067, Unknown=0, NotChecked=0, Total=7482 [2021-11-21 01:57:49,486 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 334 mSDsluCounter, 689 mSDsCounter, 0 mSdLazyCounter, 1623 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 683 SdHoareTripleChecker+Invalid, 1754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 1623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:49,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 683 Invalid, 1754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 1623 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 01:57:49,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-21 01:57:49,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-11-21 01:57:49,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:49,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-11-21 01:57:49,493 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 65 [2021-11-21 01:57:49,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:49,493 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-11-21 01:57:49,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.603448275862069) internal successors, (151), 57 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:49,493 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-11-21 01:57:49,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-21 01:57:49,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:49,494 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1] [2021-11-21 01:57:49,521 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-21 01:57:49,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:49,699 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:49,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:49,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1055980432, now seen corresponding path program 15 times [2021-11-21 01:57:49,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:49,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898408564] [2021-11-21 01:57:49,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:49,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:49,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:50,172 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 81 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:50,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:50,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898408564] [2021-11-21 01:57:50,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898408564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:50,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560554375] [2021-11-21 01:57:50,173 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:57:50,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:50,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:50,174 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:50,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:57:50,353 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:57:50,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:57:50,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-21 01:57:50,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:50,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:51,397 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 100 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:51,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:52,662 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 121 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:52,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560554375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:52,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [697287762] [2021-11-21 01:57:52,664 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:57:52,664 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:52,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:52,664 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:52,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:52,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:57:52,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:52,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:57:52,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:57:53,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:57:56,142 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:57,655 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:57,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:57:57,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2021-11-21 01:57:57,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595342524] [2021-11-21 01:57:57,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:57,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-21 01:57:57,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:57,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-21 01:57:57,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=6425, Unknown=0, NotChecked=0, Total=7140 [2021-11-21 01:57:57,658 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 77 states, 76 states have (on average 2.6447368421052633) internal successors, (201), 76 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:59,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:59,220 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2021-11-21 01:57:59,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 01:57:59,220 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 2.6447368421052633) internal successors, (201), 76 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 67 [2021-11-21 01:57:59,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:59,221 INFO L225 Difference]: With dead ends: 73 [2021-11-21 01:57:59,221 INFO L226 Difference]: Without dead ends: 73 [2021-11-21 01:57:59,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2952 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1957, Invalid=10033, Unknown=0, NotChecked=0, Total=11990 [2021-11-21 01:57:59,223 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 402 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 1338 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 402 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 1463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 1338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:59,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [402 Valid, 213 Invalid, 1463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 1338 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:57:59,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-21 01:57:59,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-11-21 01:57:59,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:59,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-21 01:57:59,227 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2021-11-21 01:57:59,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:59,227 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-21 01:57:59,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 2.6447368421052633) internal successors, (201), 76 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:57:59,228 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-21 01:57:59,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-21 01:57:59,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:59,229 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2021-11-21 01:57:59,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:59,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:59,445 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:57:59,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:59,445 INFO L85 PathProgramCache]: Analyzing trace with hash -534991968, now seen corresponding path program 16 times [2021-11-21 01:57:59,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:59,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473110199] [2021-11-21 01:57:59,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:59,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:59,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:59,948 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:57:59,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:59,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473110199] [2021-11-21 01:57:59,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473110199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:59,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378482027] [2021-11-21 01:57:59,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:57:59,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:59,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:59,953 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:59,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:58:00,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:00,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-21 01:58:00,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:00,488 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:00,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:01,563 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:01,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378482027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:01,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700390888] [2021-11-21 01:58:01,564 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:58:01,564 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:01,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:01,565 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:01,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:01,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:01,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:01,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:01,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:58:02,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:05,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:07,208 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:07,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:07,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2021-11-21 01:58:07,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986079727] [2021-11-21 01:58:07,209 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:07,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-21 01:58:07,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:07,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-21 01:58:07,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3615, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:58:07,210 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:08,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:08,785 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2021-11-21 01:58:08,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 01:58:08,786 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-21 01:58:08,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:08,787 INFO L225 Difference]: With dead ends: 120 [2021-11-21 01:58:08,787 INFO L226 Difference]: Without dead ends: 75 [2021-11-21 01:58:08,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=302, Invalid=6670, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 01:58:08,789 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 71 mSDsluCounter, 1121 mSDsCounter, 0 mSdLazyCounter, 1352 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 1134 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:08,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 1134 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1352 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:58:08,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-21 01:58:08,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-11-21 01:58:08,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:08,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-11-21 01:58:08,794 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2021-11-21 01:58:08,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:08,794 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-11-21 01:58:08,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:08,795 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-11-21 01:58:08,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-21 01:58:08,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:08,796 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1] [2021-11-21 01:58:08,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-21 01:58:09,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:09,021 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:58:09,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:09,022 INFO L85 PathProgramCache]: Analyzing trace with hash -2130944081, now seen corresponding path program 17 times [2021-11-21 01:58:09,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:09,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165754988] [2021-11-21 01:58:09,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:09,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:09,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:09,736 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 100 proven. 286 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:09,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:09,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165754988] [2021-11-21 01:58:09,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165754988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:09,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707581900] [2021-11-21 01:58:09,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:58:09,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:09,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:09,738 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:09,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:58:10,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 01:58:10,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:10,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 146 conjunts are in the unsatisfiable core [2021-11-21 01:58:10,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:10,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:12,255 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 12 proven. 242 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2021-11-21 01:58:12,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:15,721 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 296 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-21 01:58:15,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707581900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:15,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909396794] [2021-11-21 01:58:15,725 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:58:15,725 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:15,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:15,725 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:15,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:15,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:15,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:58:16,184 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:58:16,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:58:16,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:20,224 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:22,183 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:22,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:22,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 29, 31] total 87 [2021-11-21 01:58:22,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860309599] [2021-11-21 01:58:22,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:22,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-21 01:58:22,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:22,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-21 01:58:22,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=760, Invalid=8552, Unknown=0, NotChecked=0, Total=9312 [2021-11-21 01:58:22,186 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 89 states, 88 states have (on average 2.0568181818181817) internal successors, (181), 88 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:34,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:34,342 INFO L93 Difference]: Finished difference Result 122 states and 123 transitions. [2021-11-21 01:58:34,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-21 01:58:34,342 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 2.0568181818181817) internal successors, (181), 88 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-21 01:58:34,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:34,343 INFO L225 Difference]: With dead ends: 122 [2021-11-21 01:58:34,343 INFO L226 Difference]: Without dead ends: 122 [2021-11-21 01:58:34,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=4761, Invalid=24309, Unknown=0, NotChecked=0, Total=29070 [2021-11-21 01:58:34,345 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 440 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 2135 mSolverCounterSat, 585 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 2720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 585 IncrementalHoareTripleChecker+Valid, 2135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:34,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [440 Valid, 292 Invalid, 2720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [585 Valid, 2135 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 01:58:34,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-21 01:58:34,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-11-21 01:58:34,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:34,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-11-21 01:58:34,350 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 73 [2021-11-21 01:58:34,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:34,350 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-11-21 01:58:34,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 88 states have (on average 2.0568181818181817) internal successors, (181), 88 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:34,351 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-11-21 01:58:34,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 01:58:34,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:34,353 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 12, 12, 1, 1, 1, 1] [2021-11-21 01:58:34,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:34,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:34,563 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:58:34,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:34,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1622600687, now seen corresponding path program 18 times [2021-11-21 01:58:34,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:34,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134490779] [2021-11-21 01:58:34,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:34,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:34,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:35,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 826 proven. 156 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 01:58:35,292 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:35,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134490779] [2021-11-21 01:58:35,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134490779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:35,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379709736] [2021-11-21 01:58:35,292 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:58:35,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:35,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:35,297 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:35,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 01:58:35,510 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:58:35,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:35,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-21 01:58:35,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:35,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:36,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 815 proven. 167 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 01:58:36,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:37,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 814 proven. 168 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-21 01:58:37,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379709736] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:37,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104027338] [2021-11-21 01:58:37,701 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:58:37,701 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:37,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:37,702 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:37,702 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:37,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:37,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:38,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:38,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:58:38,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:41,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:42,949 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:42,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:42,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 72 [2021-11-21 01:58:42,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283305371] [2021-11-21 01:58:42,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:42,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-21 01:58:42,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:42,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-21 01:58:42,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=794, Invalid=5686, Unknown=0, NotChecked=0, Total=6480 [2021-11-21 01:58:42,966 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:44,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:44,526 INFO L93 Difference]: Finished difference Result 176 states and 177 transitions. [2021-11-21 01:58:44,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-21 01:58:44,527 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-21 01:58:44,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:44,528 INFO L225 Difference]: With dead ends: 176 [2021-11-21 01:58:44,528 INFO L226 Difference]: Without dead ends: 125 [2021-11-21 01:58:44,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 310 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3940 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2423, Invalid=12097, Unknown=0, NotChecked=0, Total=14520 [2021-11-21 01:58:44,529 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 69 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:44,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 170 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:58:44,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-21 01:58:44,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-11-21 01:58:44,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:44,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2021-11-21 01:58:44,534 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 121 [2021-11-21 01:58:44,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:44,535 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2021-11-21 01:58:44,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.5616438356164384) internal successors, (187), 72 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:44,535 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2021-11-21 01:58:44,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-21 01:58:44,537 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:44,537 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 13, 13, 1, 1, 1, 1] [2021-11-21 01:58:44,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:44,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 01:58:44,753 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:58:44,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:44,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1310171586, now seen corresponding path program 19 times [2021-11-21 01:58:44,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:44,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018126112] [2021-11-21 01:58:44,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:44,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:44,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:45,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 865 proven. 182 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:58:45,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:45,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018126112] [2021-11-21 01:58:45,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018126112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:45,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706629047] [2021-11-21 01:58:45,428 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:58:45,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:45,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:45,433 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:45,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 01:58:45,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:45,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-21 01:58:45,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:45,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:47,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 853 proven. 194 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:58:47,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:47,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 852 proven. 195 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 01:58:47,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706629047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:47,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151551948] [2021-11-21 01:58:47,999 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:58:48,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:48,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:48,000 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:48,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:48,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:58:48,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:48,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:58:48,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:58:52,695 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:54,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:54,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:58:54,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 77 [2021-11-21 01:58:54,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018392041] [2021-11-21 01:58:54,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:54,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-21 01:58:54,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:54,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-21 01:58:54,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=6409, Unknown=0, NotChecked=0, Total=7310 [2021-11-21 01:58:54,257 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:56,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:56,245 INFO L93 Difference]: Finished difference Result 182 states and 183 transitions. [2021-11-21 01:58:56,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-21 01:58:56,245 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 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 123 [2021-11-21 01:58:56,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:56,246 INFO L225 Difference]: With dead ends: 182 [2021-11-21 01:58:56,246 INFO L226 Difference]: Without dead ends: 127 [2021-11-21 01:58:56,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 313 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4488 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=2759, Invalid=13753, Unknown=0, NotChecked=0, Total=16512 [2021-11-21 01:58:56,248 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 77 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 656 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:56,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 188 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 656 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:58:56,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-21 01:58:56,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-11-21 01:58:56,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:56,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-11-21 01:58:56,252 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2021-11-21 01:58:56,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:56,253 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-11-21 01:58:56,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 2.576923076923077) internal successors, (201), 77 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:58:56,253 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-11-21 01:58:56,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 01:58:56,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:56,255 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 14, 14, 1, 1, 1, 1] [2021-11-21 01:58:56,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-21 01:58:56,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 01:58:56,469 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:58:56,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:56,470 INFO L85 PathProgramCache]: Analyzing trace with hash 2089187533, now seen corresponding path program 20 times [2021-11-21 01:58:56,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:56,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581621947] [2021-11-21 01:58:56,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:56,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:56,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:57,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 900 proven. 210 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-21 01:58:57,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:57,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581621947] [2021-11-21 01:58:57,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [581621947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:57,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752665992] [2021-11-21 01:58:57,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:58:57,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:57,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:57,297 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:57,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 01:59:05,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 01:59:05,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:05,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 158 conjunts are in the unsatisfiable core [2021-11-21 01:59:05,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:05,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:07,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 958 proven. 212 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 01:59:07,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:08,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 958 proven. 212 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-21 01:59:08,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752665992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:08,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1275381856] [2021-11-21 01:59:08,745 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:59:08,746 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:08,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:08,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:08,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:08,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:08,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:59:09,243 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 01:59:09,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 01:59:09,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:59:13,944 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:15,429 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:15,429 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:15,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 35, 35] total 85 [2021-11-21 01:59:15,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985282318] [2021-11-21 01:59:15,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:15,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-21 01:59:15,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:15,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-21 01:59:15,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1399, Invalid=7343, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 01:59:15,432 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 86 states, 86 states have (on average 2.6744186046511627) internal successors, (230), 85 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:17,198 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2021-11-21 01:59:17,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 01:59:17,199 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 2.6744186046511627) internal successors, (230), 85 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2021-11-21 01:59:17,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:17,200 INFO L225 Difference]: With dead ends: 258 [2021-11-21 01:59:17,200 INFO L226 Difference]: Without dead ends: 132 [2021-11-21 01:59:17,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 313 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6141 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3082, Invalid=13688, Unknown=0, NotChecked=0, Total=16770 [2021-11-21 01:59:17,201 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 76 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:17,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 251 Invalid, 894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:17,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-21 01:59:17,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-11-21 01:59:17,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2021-11-21 01:59:17,206 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 125 [2021-11-21 01:59:17,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:17,207 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2021-11-21 01:59:17,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 2.6744186046511627) internal successors, (230), 85 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,208 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2021-11-21 01:59:17,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-21 01:59:17,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:17,209 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 17, 17, 1, 1, 1, 1] [2021-11-21 01:59:17,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:17,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:17,418 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:59:17,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:17,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1532618246, now seen corresponding path program 21 times [2021-11-21 01:59:17,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:17,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886687530] [2021-11-21 01:59:17,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:17,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:17,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:18,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 948 proven. 339 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:59:18,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:18,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886687530] [2021-11-21 01:59:18,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886687530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:18,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382416472] [2021-11-21 01:59:18,526 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:59:18,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:18,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:18,528 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:18,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 01:59:18,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:59:18,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:18,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-21 01:59:18,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:18,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:20,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 965 proven. 322 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:59:20,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:21,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1347 backedges. 964 proven. 323 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 01:59:21,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382416472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:21,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876956588] [2021-11-21 01:59:21,330 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:59:21,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:21,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:21,331 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:21,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:21,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:21,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:59:21,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:21,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:59:21,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:59:25,909 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:27,400 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:27,400 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:27,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2021-11-21 01:59:27,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381034213] [2021-11-21 01:59:27,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:27,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-21 01:59:27,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:27,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-21 01:59:27,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=6478, Unknown=0, NotChecked=0, Total=7656 [2021-11-21 01:59:27,403 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 80 states, 80 states have (on average 2.7875) internal successors, (223), 79 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:29,082 INFO L93 Difference]: Finished difference Result 206 states and 207 transitions. [2021-11-21 01:59:29,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-21 01:59:29,082 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.7875) internal successors, (223), 79 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-21 01:59:29,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:29,083 INFO L225 Difference]: With dead ends: 206 [2021-11-21 01:59:29,083 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 01:59:29,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4114 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3323, Invalid=12427, Unknown=0, NotChecked=0, Total=15750 [2021-11-21 01:59:29,084 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 68 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:29,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 225 Invalid, 761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:59:29,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 01:59:29,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2021-11-21 01:59:29,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2021-11-21 01:59:29,089 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 131 [2021-11-21 01:59:29,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:29,089 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2021-11-21 01:59:29,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.7875) internal successors, (223), 79 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,090 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2021-11-21 01:59:29,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-21 01:59:29,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:29,091 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 18, 18, 1, 1, 1, 1] [2021-11-21 01:59:29,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:29,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 01:59:29,297 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:59:29,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:29,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1228655223, now seen corresponding path program 22 times [2021-11-21 01:59:29,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:29,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575546856] [2021-11-21 01:59:29,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:29,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:29,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:30,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 965 proven. 377 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 01:59:30,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:30,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575546856] [2021-11-21 01:59:30,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575546856] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:30,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660435937] [2021-11-21 01:59:30,484 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:59:30,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:30,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:30,489 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:30,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 01:59:30,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:30,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 141 conjunts are in the unsatisfiable core [2021-11-21 01:59:30,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:30,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:32,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 983 proven. 359 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 01:59:32,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 982 proven. 360 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 01:59:33,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660435937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:33,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191100977] [2021-11-21 01:59:33,472 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:59:33,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:33,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:33,473 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:33,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:33,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:33,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:59:33,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:33,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 01:59:34,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 01:59:38,095 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:39,490 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:39,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:39,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2021-11-21 01:59:39,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249652346] [2021-11-21 01:59:39,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:39,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-21 01:59:39,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:39,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-21 01:59:39,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1298, Invalid=7074, Unknown=0, NotChecked=0, Total=8372 [2021-11-21 01:59:39,493 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 84 states, 84 states have (on average 2.7976190476190474) internal successors, (235), 83 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:41,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:41,276 INFO L93 Difference]: Finished difference Result 212 states and 213 transitions. [2021-11-21 01:59:41,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-21 01:59:41,276 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 2.7976190476190474) internal successors, (235), 83 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 133 [2021-11-21 01:59:41,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:41,277 INFO L225 Difference]: With dead ends: 212 [2021-11-21 01:59:41,277 INFO L226 Difference]: Without dead ends: 137 [2021-11-21 01:59:41,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 348 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4503 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3666, Invalid=13626, Unknown=0, NotChecked=0, Total=17292 [2021-11-21 01:59:41,279 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 44 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:41,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 267 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:59:41,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-21 01:59:41,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-11-21 01:59:41,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:41,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2021-11-21 01:59:41,283 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 133 [2021-11-21 01:59:41,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:41,284 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2021-11-21 01:59:41,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 2.7976190476190474) internal successors, (235), 83 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:41,284 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2021-11-21 01:59:41,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-21 01:59:41,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:41,285 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 19, 19, 1, 1, 1, 1] [2021-11-21 01:59:41,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:41,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 01:59:41,505 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 01:59:41,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:41,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1177966248, now seen corresponding path program 23 times [2021-11-21 01:59:41,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:41,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103548874] [2021-11-21 01:59:41,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:41,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:41,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:42,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1419 backedges. 987 proven. 420 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:59:42,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:42,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103548874] [2021-11-21 01:59:42,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103548874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:42,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733295236] [2021-11-21 01:59:42,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:42,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:42,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:42,706 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:42,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 01:59:57,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 01:59:57,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:57,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 175 conjunts are in the unsatisfiable core [2021-11-21 01:59:57,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:57,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 01:59:59,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1419 backedges. 1036 proven. 383 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:59,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:01,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1419 backedges. 1036 proven. 383 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:01,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733295236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:01,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [267426895] [2021-11-21 02:00:01,749 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:00:01,749 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:01,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:01,750 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:01,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:01,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:00:01,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:00:02,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:02,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 02:00:02,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:00:06,820 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:08,611 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:08,611 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:00:08,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 116 [2021-11-21 02:00:08,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796412856] [2021-11-21 02:00:08,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:08,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-21 02:00:08,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:08,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-21 02:00:08,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2201, Invalid=13299, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 02:00:08,615 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 117 states, 117 states have (on average 2.700854700854701) internal successors, (316), 116 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:12,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:12,145 INFO L93 Difference]: Finished difference Result 314 states and 317 transitions. [2021-11-21 02:00:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-21 02:00:12,146 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 2.700854700854701) internal successors, (316), 116 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-21 02:00:12,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:12,149 INFO L225 Difference]: With dead ends: 314 [2021-11-21 02:00:12,149 INFO L226 Difference]: Without dead ends: 144 [2021-11-21 02:00:12,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12646 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=6857, Invalid=29815, Unknown=0, NotChecked=0, Total=36672 [2021-11-21 02:00:12,154 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 101 mSDsluCounter, 710 mSDsCounter, 0 mSdLazyCounter, 1415 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 1461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:12,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 408 Invalid, 1461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1415 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 02:00:12,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-21 02:00:12,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-11-21 02:00:12,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:12,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2021-11-21 02:00:12,158 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 135 [2021-11-21 02:00:12,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:12,158 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2021-11-21 02:00:12,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 2.700854700854701) internal successors, (316), 116 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:12,158 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2021-11-21 02:00:12,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 02:00:12,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:12,160 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 1, 1, 1, 1] [2021-11-21 02:00:12,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-21 02:00:12,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-21 02:00:12,375 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:00:12,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:12,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1459596052, now seen corresponding path program 24 times [2021-11-21 02:00:12,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:12,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411837900] [2021-11-21 02:00:12,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:12,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:12,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:14,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:14,193 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:14,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411837900] [2021-11-21 02:00:14,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411837900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:14,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662093171] [2021-11-21 02:00:14,194 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:00:14,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:14,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:14,195 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:14,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 02:00:14,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:00:14,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:00:14,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-21 02:00:14,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:15,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:19,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:19,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662093171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:19,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [486195010] [2021-11-21 02:00:19,989 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:00:19,989 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:19,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:19,990 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:19,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:20,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:00:20,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:00:20,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:00:20,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 02:00:20,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:00:24,955 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:27,500 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:27,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:00:27,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 101 [2021-11-21 02:00:27,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529854328] [2021-11-21 02:00:27,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:27,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2021-11-21 02:00:27,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:27,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-11-21 02:00:27,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=11703, Unknown=0, NotChecked=0, Total=11990 [2021-11-21 02:00:27,505 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:34,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:34,188 INFO L93 Difference]: Finished difference Result 240 states and 241 transitions. [2021-11-21 02:00:34,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-21 02:00:34,188 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-21 02:00:34,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:34,190 INFO L225 Difference]: With dead ends: 240 [2021-11-21 02:00:34,190 INFO L226 Difference]: Without dead ends: 147 [2021-11-21 02:00:34,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 367 SyntacticMatches, 2 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3216 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=566, Invalid=23614, Unknown=0, NotChecked=0, Total=24180 [2021-11-21 02:00:34,193 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 143 mSDsluCounter, 4834 mSDsCounter, 0 mSdLazyCounter, 5249 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 4866 SdHoareTripleChecker+Invalid, 5320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 5249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:34,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 4866 Invalid, 5320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 5249 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 02:00:34,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-21 02:00:34,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2021-11-21 02:00:34,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:34,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-11-21 02:00:34,199 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 143 [2021-11-21 02:00:34,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:34,199 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-11-21 02:00:34,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:34,200 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-11-21 02:00:34,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-21 02:00:34,201 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:34,201 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 1, 1, 1, 1] [2021-11-21 02:00:34,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:34,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:34,413 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:00:34,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:34,414 INFO L85 PathProgramCache]: Analyzing trace with hash 956164131, now seen corresponding path program 25 times [2021-11-21 02:00:34,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:34,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797440723] [2021-11-21 02:00:34,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:34,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:34,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:36,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 484 proven. 1150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:36,183 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:36,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797440723] [2021-11-21 02:00:36,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797440723] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:36,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983255546] [2021-11-21 02:00:36,183 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:00:36,183 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:36,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:36,198 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:36,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 02:00:36,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:36,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 225 conjunts are in the unsatisfiable core [2021-11-21 02:00:36,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:00:38,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:38,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:00:40,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 02:00:40,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:40,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983255546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:00:40,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080745423] [2021-11-21 02:00:40,477 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:00:40,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:00:40,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:00:40,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:00:40,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:00:40,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:00:40,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 02:00:41,057 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:00:41,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 02:00:41,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:00:45,948 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:48,359 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:48,359 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:00:48,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 52, 52] total 107 [2021-11-21 02:00:48,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405236432] [2021-11-21 02:00:48,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:48,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-21 02:00:48,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:48,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-21 02:00:48,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1391, Invalid=12181, Unknown=0, NotChecked=0, Total=13572 [2021-11-21 02:00:48,361 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:53,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:00:53,060 INFO L93 Difference]: Finished difference Result 151 states and 152 transitions. [2021-11-21 02:00:53,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-21 02:00:53,061 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-21 02:00:53,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:00:53,062 INFO L225 Difference]: With dead ends: 151 [2021-11-21 02:00:53,063 INFO L226 Difference]: Without dead ends: 151 [2021-11-21 02:00:53,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6603 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=4993, Invalid=23063, Unknown=0, NotChecked=0, Total=28056 [2021-11-21 02:00:53,065 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1040 mSDsluCounter, 1304 mSDsCounter, 0 mSdLazyCounter, 4197 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1040 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 4540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 4197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:00:53,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1040 Valid, 708 Invalid, 4540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 4197 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-21 02:00:53,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-21 02:00:53,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2021-11-21 02:00:53,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:53,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-11-21 02:00:53,070 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2021-11-21 02:00:53,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:00:53,071 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-11-21 02:00:53,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 108 states have (on average 2.7314814814814814) internal successors, (295), 108 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:00:53,071 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-11-21 02:00:53,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-21 02:00:53,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:00:53,073 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 1, 1, 1, 1] [2021-11-21 02:00:53,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-21 02:00:53,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-21 02:00:53,293 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:00:53,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:00:53,294 INFO L85 PathProgramCache]: Analyzing trace with hash 968654291, now seen corresponding path program 26 times [2021-11-21 02:00:53,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:00:53,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372736898] [2021-11-21 02:00:53,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:00:53,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:00:53,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:00:54,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:00:54,965 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:00:54,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372736898] [2021-11-21 02:00:54,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372736898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:00:54,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709690523] [2021-11-21 02:00:54,965 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:00:54,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:00:54,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:00:54,967 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:00:54,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 02:01:10,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-21 02:01:10,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:10,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-21 02:01:10,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:10,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:01:12,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-21 02:01:12,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:12,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:18,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:18,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709690523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:18,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494438767] [2021-11-21 02:01:18,136 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:01:18,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:18,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:18,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:18,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:18,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:01:18,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 02:01:18,613 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:01:18,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 02:01:18,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:01:22,508 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:24,831 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:24,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:01:24,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 127 [2021-11-21 02:01:24,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864307505] [2021-11-21 02:01:24,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:24,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-21 02:01:24,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:24,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-21 02:01:24,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=18002, Unknown=0, NotChecked=0, Total=18360 [2021-11-21 02:01:24,835 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 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) [2021-11-21 02:01:38,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:38,795 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2021-11-21 02:01:38,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-21 02:01:38,796 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 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) Word has length 149 [2021-11-21 02:01:38,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:38,797 INFO L225 Difference]: With dead ends: 250 [2021-11-21 02:01:38,797 INFO L226 Difference]: Without dead ends: 153 [2021-11-21 02:01:38,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6165 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=1255, Invalid=32785, Unknown=0, NotChecked=0, Total=34040 [2021-11-21 02:01:38,799 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 1878 mSDsluCounter, 3660 mSDsCounter, 0 mSdLazyCounter, 8665 mSolverCounterSat, 674 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1878 SdHoareTripleChecker+Valid, 3645 SdHoareTripleChecker+Invalid, 9339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 674 IncrementalHoareTripleChecker+Valid, 8665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:38,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1878 Valid, 3645 Invalid, 9339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [674 Valid, 8665 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-21 02:01:38,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-21 02:01:38,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2021-11-21 02:01:38,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:38,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2021-11-21 02:01:38,804 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 149 [2021-11-21 02:01:38,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:38,805 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2021-11-21 02:01:38,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.7109375) internal successors, (347), 127 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) [2021-11-21 02:01:38,805 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2021-11-21 02:01:38,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-21 02:01:38,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:38,806 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 25, 24, 24, 24, 1, 1, 1, 1] [2021-11-21 02:01:38,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:39,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:39,019 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:01:39,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:39,020 INFO L85 PathProgramCache]: Analyzing trace with hash 450261922, now seen corresponding path program 27 times [2021-11-21 02:01:39,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:39,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534188542] [2021-11-21 02:01:39,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:39,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:39,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:40,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 529 proven. 1248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:40,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:40,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534188542] [2021-11-21 02:01:40,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534188542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:40,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654232936] [2021-11-21 02:01:40,615 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:01:40,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:40,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:40,616 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:40,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 02:01:41,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:01:41,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:41,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 793 conjuncts, 234 conjunts are in the unsatisfiable core [2021-11-21 02:01:41,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:42,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:42,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:44,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-21 02:01:44,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:44,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654232936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:44,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [666553224] [2021-11-21 02:01:44,773 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:01:44,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:44,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:44,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:44,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:44,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:01:44,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:01:45,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:45,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 02:01:45,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:01:48,803 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:01:50,499 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:01:50,499 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:01:50,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 54, 54] total 111 [2021-11-21 02:01:50,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736151335] [2021-11-21 02:01:50,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:01:50,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-21 02:01:50,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:01:50,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-21 02:01:50,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1496, Invalid=13024, Unknown=0, NotChecked=0, Total=14520 [2021-11-21 02:01:50,502 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 113 states, 112 states have (on average 2.7410714285714284) internal successors, (307), 112 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:55,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:55,007 INFO L93 Difference]: Finished difference Result 157 states and 158 transitions. [2021-11-21 02:01:55,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-21 02:01:55,008 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 112 states have (on average 2.7410714285714284) internal successors, (307), 112 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-21 02:01:55,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:55,008 INFO L225 Difference]: With dead ends: 157 [2021-11-21 02:01:55,009 INFO L226 Difference]: Without dead ends: 157 [2021-11-21 02:01:55,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 385 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7089 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=5372, Invalid=24730, Unknown=0, NotChecked=0, Total=30102 [2021-11-21 02:01:55,010 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 1243 mSDsluCounter, 1340 mSDsCounter, 0 mSdLazyCounter, 4331 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1243 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 4739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 4331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:55,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1243 Valid, 704 Invalid, 4739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 4331 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-21 02:01:55,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-21 02:01:55,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-11-21 02:01:55,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:55,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2021-11-21 02:01:55,014 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 151 [2021-11-21 02:01:55,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:55,015 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2021-11-21 02:01:55,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 112 states have (on average 2.7410714285714284) internal successors, (307), 112 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:55,015 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2021-11-21 02:01:55,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-21 02:01:55,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:55,016 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 1, 1, 1, 1] [2021-11-21 02:01:55,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:55,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:55,229 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:01:55,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:55,229 INFO L85 PathProgramCache]: Analyzing trace with hash 492122578, now seen corresponding path program 28 times [2021-11-21 02:01:55,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:55,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126803522] [2021-11-21 02:01:55,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:55,231 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:55,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:56,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:56,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:56,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126803522] [2021-11-21 02:01:56,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126803522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:56,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093211244] [2021-11-21 02:01:56,828 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:01:56,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:56,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:56,828 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:56,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 02:01:59,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:59,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-21 02:01:59,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:59,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:01:59,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:02:04,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:02:04,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093211244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:02:04,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980434316] [2021-11-21 02:02:04,822 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:02:04,822 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:02:04,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:02:04,823 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:02:04,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:02:04,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:02:05,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 02:02:05,238 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:02:05,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 02:02:05,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:02:09,911 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:02:12,574 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:02:12,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:02:12,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2021-11-21 02:02:12,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562347844] [2021-11-21 02:02:12,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:02:12,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2021-11-21 02:02:12,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:02:12,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-11-21 02:02:12,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=13499, Unknown=0, NotChecked=0, Total=13806 [2021-11-21 02:02:12,580 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:19,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:02:19,422 INFO L93 Difference]: Finished difference Result 260 states and 261 transitions. [2021-11-21 02:02:19,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-21 02:02:19,422 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-21 02:02:19,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:02:19,423 INFO L225 Difference]: With dead ends: 260 [2021-11-21 02:02:19,424 INFO L226 Difference]: Without dead ends: 159 [2021-11-21 02:02:19,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 399 SyntacticMatches, 2 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3688 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=610, Invalid=27446, Unknown=0, NotChecked=0, Total=28056 [2021-11-21 02:02:19,426 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 154 mSDsluCounter, 5605 mSDsCounter, 0 mSdLazyCounter, 6104 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 5638 SdHoareTripleChecker+Invalid, 6181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 6104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-21 02:02:19,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 5638 Invalid, 6181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 6104 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-21 02:02:19,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-21 02:02:19,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2021-11-21 02:02:19,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:19,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-11-21 02:02:19,430 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 155 [2021-11-21 02:02:19,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:02:19,431 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-11-21 02:02:19,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:19,431 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-11-21 02:02:19,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-21 02:02:19,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:02:19,432 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 1, 1, 1, 1] [2021-11-21 02:02:19,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 02:02:19,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:19,660 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:02:19,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:02:19,660 INFO L85 PathProgramCache]: Analyzing trace with hash 613240929, now seen corresponding path program 29 times [2021-11-21 02:02:19,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:02:19,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425185795] [2021-11-21 02:02:19,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:19,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:02:19,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:02:21,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 576 proven. 1350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 02:02:21,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:02:21,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425185795] [2021-11-21 02:02:21,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425185795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:02:21,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249502457] [2021-11-21 02:02:21,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:02:21,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:21,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:02:21,286 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:02:21,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 02:02:50,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-21 02:02:50,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:02:50,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 296 conjunts are in the unsatisfiable core [2021-11-21 02:02:50,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:02:50,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:02:55,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 26 proven. 1250 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2021-11-21 02:02:55,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:03:07,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 02:03:07,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249502457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:03:07,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122709947] [2021-11-21 02:03:07,293 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:03:07,293 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:03:07,293 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:03:07,294 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:03:07,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:03:07,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:03:07,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:03:07,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:03:07,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 142 treesize of output 134 [2021-11-21 02:03:07,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:03:11,808 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:03:15,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:03:15,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:03:15,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 57, 64] total 176 [2021-11-21 02:03:15,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238773006] [2021-11-21 02:03:15,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:03:15,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2021-11-21 02:03:15,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:03:15,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-11-21 02:03:15,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2971, Invalid=31439, Unknown=0, NotChecked=0, Total=34410 [2021-11-21 02:03:15,196 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 178 states, 177 states have (on average 2.1864406779661016) internal successors, (387), 177 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:25,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:04:25,686 INFO L93 Difference]: Finished difference Result 262 states and 263 transitions. [2021-11-21 02:04:25,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2021-11-21 02:04:25,686 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 177 states have (on average 2.1864406779661016) internal successors, (387), 177 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2021-11-21 02:04:25,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:04:25,688 INFO L225 Difference]: With dead ends: 262 [2021-11-21 02:04:25,688 INFO L226 Difference]: Without dead ends: 262 [2021-11-21 02:04:25,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 342 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17515 ImplicationChecksByTransitivity, 82.3s TimeCoverageRelationStatistics Valid=20229, Invalid=97763, Unknown=0, NotChecked=0, Total=117992 [2021-11-21 02:04:25,696 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 1647 mSDsluCounter, 1357 mSDsCounter, 0 mSdLazyCounter, 8517 mSolverCounterSat, 2136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1647 SdHoareTripleChecker+Valid, 1381 SdHoareTripleChecker+Invalid, 10653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2136 IncrementalHoareTripleChecker+Valid, 8517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-21 02:04:25,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1647 Valid, 1381 Invalid, 10653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2136 Valid, 8517 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2021-11-21 02:04:25,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-21 02:04:25,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-11-21 02:04:25,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:25,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2021-11-21 02:04:25,703 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 157 [2021-11-21 02:04:25,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:04:25,703 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2021-11-21 02:04:25,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 178 states, 177 states have (on average 2.1864406779661016) internal successors, (387), 177 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:25,704 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2021-11-21 02:04:25,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-11-21 02:04:25,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:04:25,729 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 26, 26, 1, 1, 1, 1] [2021-11-21 02:04:25,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-21 02:04:25,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 02:04:25,929 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:04:25,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:04:25,930 INFO L85 PathProgramCache]: Analyzing trace with hash -272611775, now seen corresponding path program 30 times [2021-11-21 02:04:25,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:04:25,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570791643] [2021-11-21 02:04:25,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:04:25,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:04:26,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:04:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 3925 proven. 753 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-11-21 02:04:27,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:04:27,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570791643] [2021-11-21 02:04:27,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570791643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:04:27,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551010220] [2021-11-21 02:04:27,471 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:04:27,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:04:27,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:04:27,472 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:04:27,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 02:04:29,793 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:04:29,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:04:29,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 1343 conjuncts, 302 conjunts are in the unsatisfiable core [2021-11-21 02:04:29,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:04:29,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:04:32,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 3976 proven. 702 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-11-21 02:04:32,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:04:35,306 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 3976 proven. 702 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-11-21 02:04:35,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551010220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:04:35,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1997466453] [2021-11-21 02:04:35,308 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:04:35,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:04:35,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:04:35,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:04:35,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:04:35,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:04:35,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 02:04:35,678 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:04:35,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 02:04:35,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:04:40,089 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:04:41,748 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:04:41,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:04:41,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 143 [2021-11-21 02:04:41,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320410896] [2021-11-21 02:04:41,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:04:41,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2021-11-21 02:04:41,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:04:41,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-11-21 02:04:41,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3231, Invalid=19721, Unknown=0, NotChecked=0, Total=22952 [2021-11-21 02:04:41,752 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand has 144 states, 144 states have (on average 2.6666666666666665) internal successors, (384), 143 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:44,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:04:44,888 INFO L93 Difference]: Finished difference Result 372 states and 373 transitions. [2021-11-21 02:04:44,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-21 02:04:44,888 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 2.6666666666666665) internal successors, (384), 143 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 261 [2021-11-21 02:04:44,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:04:44,890 INFO L225 Difference]: With dead ends: 372 [2021-11-21 02:04:44,890 INFO L226 Difference]: Without dead ends: 265 [2021-11-21 02:04:44,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 688 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15209 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=7991, Invalid=35065, Unknown=0, NotChecked=0, Total=43056 [2021-11-21 02:04:44,894 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 104 mSDsluCounter, 588 mSDsCounter, 0 mSdLazyCounter, 1249 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 1269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 02:04:44,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 368 Invalid, 1269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1249 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 02:04:44,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-21 02:04:44,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 264. [2021-11-21 02:04:44,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.0076045627376427) internal successors, (265), 263 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:44,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 265 transitions. [2021-11-21 02:04:44,900 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 265 transitions. Word has length 261 [2021-11-21 02:04:44,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:04:44,900 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 265 transitions. [2021-11-21 02:04:44,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 2.6666666666666665) internal successors, (384), 143 states have internal predecessors, (384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:44,900 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 265 transitions. [2021-11-21 02:04:44,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-21 02:04:44,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:04:44,902 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 27, 27, 1, 1, 1, 1] [2021-11-21 02:04:44,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 02:04:45,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-21 02:04:45,102 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:04:45,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:04:45,103 INFO L85 PathProgramCache]: Analyzing trace with hash -1879455216, now seen corresponding path program 31 times [2021-11-21 02:04:45,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:04:45,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675862342] [2021-11-21 02:04:45,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:04:45,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:04:45,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:04:46,793 INFO L134 CoverageAnalysis]: Checked inductivity of 5931 backedges. 4018 proven. 809 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-11-21 02:04:46,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:04:46,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675862342] [2021-11-21 02:04:46,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675862342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:04:46,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090535586] [2021-11-21 02:04:46,794 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:04:46,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:04:46,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:04:46,801 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:04:46,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 02:04:47,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:04:47,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 204 conjunts are in the unsatisfiable core [2021-11-21 02:04:47,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:04:47,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:04:49,331 INFO L134 CoverageAnalysis]: Checked inductivity of 5931 backedges. 4045 proven. 782 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-11-21 02:04:49,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:04:51,646 INFO L134 CoverageAnalysis]: Checked inductivity of 5931 backedges. 4044 proven. 783 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-11-21 02:04:51,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090535586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:04:51,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [407137160] [2021-11-21 02:04:51,648 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 02:04:51,648 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:04:51,649 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:04:51,649 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:04:51,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:04:51,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 02:04:51,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 02:04:52,108 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 02:04:52,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 111 [2021-11-21 02:04:52,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 02:04:56,414 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:04:57,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:04:57,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:04:57,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2021-11-21 02:04:57,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029299687] [2021-11-21 02:04:57,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:04:57,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2021-11-21 02:04:57,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:04:57,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-11-21 02:04:57,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2648, Invalid=13608, Unknown=0, NotChecked=0, Total=16256 [2021-11-21 02:04:57,999 INFO L87 Difference]: Start difference. First operand 264 states and 265 transitions. Second operand has 120 states, 120 states have (on average 2.8583333333333334) internal successors, (343), 119 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:05:00,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:05:00,664 INFO L93 Difference]: Finished difference Result 378 states and 379 transitions. [2021-11-21 02:05:00,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-21 02:05:00,665 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 2.8583333333333334) internal successors, (343), 119 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 263 [2021-11-21 02:05:00,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:05:00,667 INFO L225 Difference]: With dead ends: 378 [2021-11-21 02:05:00,667 INFO L226 Difference]: Without dead ends: 267 [2021-11-21 02:05:00,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 720 SyntacticMatches, 1 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8769 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=7518, Invalid=26892, Unknown=0, NotChecked=0, Total=34410 [2021-11-21 02:05:00,671 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 53 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 1066 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1066 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 02:05:00,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 344 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1066 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 02:05:00,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-21 02:05:00,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 266. [2021-11-21 02:05:00,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:05:00,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2021-11-21 02:05:00,677 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 263 [2021-11-21 02:05:00,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:05:00,677 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2021-11-21 02:05:00,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 2.8583333333333334) internal successors, (343), 119 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:05:00,678 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2021-11-21 02:05:00,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-21 02:05:00,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:05:00,680 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 28, 28, 1, 1, 1, 1] [2021-11-21 02:05:00,706 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-21 02:05:00,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:05:00,893 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 1 more)] === [2021-11-21 02:05:00,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:05:00,893 INFO L85 PathProgramCache]: Analyzing trace with hash 132224543, now seen corresponding path program 32 times [2021-11-21 02:05:00,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:05:00,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876261931] [2021-11-21 02:05:00,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:05:00,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:05:01,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:05:02,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5986 backedges. 4107 proven. 867 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-11-21 02:05:02,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:05:02,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876261931] [2021-11-21 02:05:02,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876261931] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:05:02,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835512143] [2021-11-21 02:05:02,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:05:02,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:05:02,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:05:02,561 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:05:02,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9cdf483a-0b10-4f68-a088-7a6d2bc79d8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process