./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6fed4ea6707efb0c46113b7defb1e72bb9bbe71f593886f20a58e457577f3a05 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:47:33,446 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:47:33,448 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:47:33,513 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:47:33,514 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:47:33,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:47:33,517 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:47:33,520 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:47:33,522 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:47:33,524 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:47:33,525 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:47:33,527 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:47:33,527 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:47:33,529 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:47:33,531 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:47:33,533 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:47:33,534 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:47:33,540 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:47:33,543 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:47:33,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:47:33,553 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:47:33,555 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:47:33,562 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:47:33,564 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:47:33,568 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:47:33,570 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:47:33,571 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:47:33,573 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:47:33,574 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:47:33,576 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:47:33,577 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:47:33,578 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:47:33,580 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:47:33,582 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:47:33,584 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:47:33,585 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:47:33,586 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:47:33,586 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:47:33,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:47:33,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:47:33,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:47:33,590 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:47:33,643 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:47:33,643 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:47:33,644 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:47:33,644 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:47:33,645 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:47:33,646 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:47:33,646 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:47:33,646 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:47:33,647 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:47:33,647 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:47:33,648 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:47:33,648 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:47:33,649 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:47:33,649 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:47:33,649 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:47:33,649 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:47:33,650 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:47:33,650 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:47:33,651 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:47:33,651 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:47:33,651 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:47:33,651 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:47:33,652 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:47:33,652 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:47:33,652 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:47:33,652 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:47:33,653 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:47:33,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:47:33,653 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:47:33,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:47:33,654 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:47:33,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:47:33,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:33,655 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:47:33,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:47:33,655 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:47:33,656 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:47:33,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:47:33,656 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:47:33,656 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:47:33,657 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:47:33,657 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_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6fed4ea6707efb0c46113b7defb1e72bb9bbe71f593886f20a58e457577f3a05 [2021-11-23 16:47:33,995 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:47:34,021 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:47:34,024 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:47:34,026 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:47:34,027 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:47:34,028 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c [2021-11-23 16:47:34,104 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/7136a84e3/61cb6d5a5d6a432cb5695daa63c2fb3d/FLAGc47d8f381 [2021-11-23 16:47:34,819 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:47:34,819 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c [2021-11-23 16:47:34,864 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/7136a84e3/61cb6d5a5d6a432cb5695daa63c2fb3d/FLAGc47d8f381 [2021-11-23 16:47:35,080 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/7136a84e3/61cb6d5a5d6a432cb5695daa63c2fb3d [2021-11-23 16:47:35,083 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:47:35,086 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:47:35,088 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:35,088 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:47:35,093 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:47:35,093 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:35,095 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78aa0fc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35, skipping insertion in model container [2021-11-23 16:47:35,095 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:35,103 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:47:35,176 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:35,711 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c[75166,75179] [2021-11-23 16:47:35,723 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:35,738 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:35,915 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c[75166,75179] [2021-11-23 16:47:35,929 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:35,951 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:35,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35 WrapperNode [2021-11-23 16:47:35,952 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:35,953 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:35,953 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:35,954 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:35,962 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,008 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,087 INFO L137 Inliner]: procedures = 31, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 797 [2021-11-23 16:47:36,088 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:36,089 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:36,089 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:36,089 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:36,098 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,099 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,108 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,109 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,196 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:36,198 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:36,198 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:36,198 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:36,199 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:35" (1/1) ... [2021-11-23 16:47:36,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:36,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:36,245 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:36,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:36,304 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:36,305 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 16:47:36,305 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 16:47:36,306 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 16:47:36,306 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 16:47:36,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:47:36,306 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 16:47:36,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:36,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:36,545 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:36,560 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:36,593 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 16:47:39,722 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 16:47:39,722 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 16:47:39,723 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:39,766 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:47:39,771 INFO L158 Benchmark]: Toolchain (without parser) took 4683.73ms. Allocated memory was 88.1MB in the beginning and 119.5MB in the end (delta: 31.5MB). Free memory was 48.3MB in the beginning and 69.3MB in the end (delta: -20.9MB). Peak memory consumption was 48.3MB. Max. memory is 16.1GB. [2021-11-23 16:47:39,771 INFO L158 Benchmark]: CDTParser took 0.36ms. Allocated memory is still 88.1MB. Free memory is still 66.8MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:47:39,772 INFO L158 Benchmark]: CACSL2BoogieTranslator took 864.55ms. Allocated memory was 88.1MB in the beginning and 119.5MB in the end (delta: 31.5MB). Free memory was 48.1MB in the beginning and 74.7MB in the end (delta: -26.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 16:47:39,773 INFO L158 Benchmark]: Boogie Procedure Inliner took 134.98ms. Allocated memory is still 119.5MB. Free memory was 74.7MB in the beginning and 69.4MB in the end (delta: 5.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 16:47:39,774 INFO L158 Benchmark]: Boogie Preprocessor took 108.12ms. Allocated memory is still 119.5MB. Free memory was 69.4MB in the beginning and 62.7MB in the end (delta: 6.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 16:47:39,775 INFO L158 Benchmark]: RCFGBuilder took 3571.06ms. Allocated memory is still 119.5MB. Free memory was 62.7MB in the beginning and 69.3MB in the end (delta: -6.6MB). Peak memory consumption was 33.7MB. Max. memory is 16.1GB. [2021-11-23 16:47:39,779 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36ms. Allocated memory is still 88.1MB. Free memory is still 66.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 864.55ms. Allocated memory was 88.1MB in the beginning and 119.5MB in the end (delta: 31.5MB). Free memory was 48.1MB in the beginning and 74.7MB in the end (delta: -26.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 134.98ms. Allocated memory is still 119.5MB. Free memory was 74.7MB in the beginning and 69.4MB in the end (delta: 5.3MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 108.12ms. Allocated memory is still 119.5MB. Free memory was 69.4MB in the beginning and 62.7MB in the end (delta: 6.8MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * RCFGBuilder took 3571.06ms. Allocated memory is still 119.5MB. Free memory was 62.7MB in the beginning and 69.3MB in the end (delta: -6.6MB). Peak memory consumption was 33.7MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:47:39,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6fed4ea6707efb0c46113b7defb1e72bb9bbe71f593886f20a58e457577f3a05 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:47:42,289 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:47:42,293 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:47:42,343 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:47:42,344 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:47:42,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:47:42,350 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:47:42,354 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:47:42,357 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:47:42,365 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:47:42,366 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:47:42,368 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:47:42,369 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:47:42,371 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:47:42,373 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:47:42,377 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:47:42,379 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:47:42,380 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:47:42,382 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:47:42,389 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:47:42,391 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:47:42,393 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:47:42,395 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:47:42,397 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:47:42,407 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:47:42,408 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:47:42,408 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:47:42,410 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:47:42,411 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:47:42,412 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:47:42,412 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:47:42,413 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:47:42,416 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:47:42,417 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:47:42,418 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:47:42,419 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:47:42,420 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:47:42,420 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:47:42,420 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:47:42,422 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:47:42,423 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:47:42,429 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:47:42,493 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:47:42,493 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:47:42,494 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:47:42,494 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:47:42,495 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:47:42,495 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:47:42,495 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:47:42,496 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:47:42,496 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:47:42,496 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:47:42,497 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:47:42,497 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:47:42,499 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:47:42,499 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:47:42,500 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:47:42,500 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:47:42,500 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:47:42,500 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:47:42,501 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:47:42,501 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:47:42,501 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:47:42,501 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:47:42,501 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:47:42,502 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:47:42,502 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:47:42,502 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:47:42,502 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:47:42,503 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:47:42,503 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:47:42,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:42,503 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:47:42,503 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:47:42,504 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:47:42,504 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:47:42,505 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:42,505 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:47:42,505 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:47:42,505 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:47:42,506 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6fed4ea6707efb0c46113b7defb1e72bb9bbe71f593886f20a58e457577f3a05 [2021-11-23 16:47:42,903 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:47:42,936 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:47:42,939 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:47:42,941 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:47:42,942 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:47:42,943 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c [2021-11-23 16:47:43,036 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/575cc70f5/9d6983de59944d1093703f934ec739d4/FLAG72bf1ede0 [2021-11-23 16:47:43,818 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:47:43,819 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c [2021-11-23 16:47:43,849 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/575cc70f5/9d6983de59944d1093703f934ec739d4/FLAG72bf1ede0 [2021-11-23 16:47:44,054 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/data/575cc70f5/9d6983de59944d1093703f934ec739d4 [2021-11-23 16:47:44,060 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:47:44,061 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:47:44,063 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:44,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:47:44,068 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:47:44,069 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:44" (1/1) ... [2021-11-23 16:47:44,071 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10d5c10b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:44, skipping insertion in model container [2021-11-23 16:47:44,071 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:44" (1/1) ... [2021-11-23 16:47:44,097 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:47:44,175 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:44,676 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c[75166,75179] [2021-11-23 16:47:44,687 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:44,724 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 16:47:44,754 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:44,895 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c[75166,75179] [2021-11-23 16:47:44,899 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:44,916 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:45,088 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/sv-benchmarks/c/openssl/s3_srvr.blast.12.i.cil-1.c[75166,75179] [2021-11-23 16:47:45,104 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:45,124 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:45,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45 WrapperNode [2021-11-23 16:47:45,125 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:45,126 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:45,127 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:45,127 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:45,135 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,180 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,251 INFO L137 Inliner]: procedures = 35, calls = 223, calls flagged for inlining = 7, calls inlined = 3, statements flattened = 767 [2021-11-23 16:47:45,252 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:45,253 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:45,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:45,253 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:45,279 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,299 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,299 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,355 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,369 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,373 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,389 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:45,390 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:45,390 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:45,394 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:45,395 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (1/1) ... [2021-11-23 16:47:45,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:45,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:45,430 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:45,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:45,482 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:45,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:47:45,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 16:47:45,482 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 16:47:45,483 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 16:47:45,483 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 16:47:45,483 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:45,483 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:45,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 16:47:45,748 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:45,750 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:45,803 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 16:47:55,433 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2021-11-23 16:47:55,434 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2021-11-23 16:47:55,434 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:55,442 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:47:55,445 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 16:47:55,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:55 BoogieIcfgContainer [2021-11-23 16:47:55,449 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:47:55,452 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:47:55,452 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:47:55,455 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:47:55,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:47:44" (1/3) ... [2021-11-23 16:47:55,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@775f605c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:55, skipping insertion in model container [2021-11-23 16:47:55,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:45" (2/3) ... [2021-11-23 16:47:55,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@775f605c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:55, skipping insertion in model container [2021-11-23 16:47:55,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:55" (3/3) ... [2021-11-23 16:47:55,461 INFO L111 eAbstractionObserver]: Analyzing ICFG s3_srvr.blast.12.i.cil-1.c [2021-11-23 16:47:55,468 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:47:55,469 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:47:55,530 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:47:55,538 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:47:55,538 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:47:55,559 INFO L276 IsEmpty]: Start isEmpty. Operand has 152 states, 150 states have (on average 1.72) internal successors, (258), 151 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:55,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:47:55,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:55,579 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:55,580 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:55,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:55,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1692197635, now seen corresponding path program 1 times [2021-11-23 16:47:55,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:55,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1373806565] [2021-11-23 16:47:55,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:55,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:55,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:55,610 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:55,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:47:56,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:56,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:47:56,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:56,837 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 13 treesize of output 9 [2021-11-23 16:47:56,850 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 13 treesize of output 9 [2021-11-23 16:47:57,729 INFO L354 Elim1Store]: treesize reduction 1496, result has 4.7 percent of original size [2021-11-23 16:47:57,729 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 8 case distinctions, treesize of input 78 treesize of output 85 [2021-11-23 16:47:57,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:57,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 36 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 85 [2021-11-23 16:47:58,146 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:47:58,147 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:47:58,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:47:58,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 10 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:47:58,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2021-11-23 16:47:58,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2021-11-23 16:47:58,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:58,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:58,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:58,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1373806565] [2021-11-23 16:47:58,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1373806565] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:58,375 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:58,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:58,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881726523] [2021-11-23 16:47:58,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:58,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:58,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:58,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:58,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:58,421 INFO L87 Difference]: Start difference. First operand has 152 states, 150 states have (on average 1.72) internal successors, (258), 151 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:00,463 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:02,472 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:06,529 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:07,762 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:13,099 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:17,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:17,191 INFO L93 Difference]: Finished difference Result 305 states and 515 transitions. [2021-11-23 16:48:17,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:48:17,196 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:48:17,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:17,209 INFO L225 Difference]: With dead ends: 305 [2021-11-23 16:48:17,209 INFO L226 Difference]: Without dead ends: 139 [2021-11-23 16:48:17,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:48:17,217 INFO L933 BasicCegarLoop]: 250 mSDtfsCounter, 10 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 841 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:17,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 841 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 175 Invalid, 3 Unknown, 0 Unchecked, 18.6s Time] [2021-11-23 16:48:17,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-23 16:48:17,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-11-23 16:48:17,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.5434782608695652) internal successors, (213), 138 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:17,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 213 transitions. [2021-11-23 16:48:17,266 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 213 transitions. Word has length 43 [2021-11-23 16:48:17,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:17,267 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 213 transitions. [2021-11-23 16:48:17,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:17,267 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 213 transitions. [2021-11-23 16:48:17,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:48:17,270 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:17,271 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:17,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:17,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:17,495 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:17,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:17,496 INFO L85 PathProgramCache]: Analyzing trace with hash 2115844357, now seen corresponding path program 1 times [2021-11-23 16:48:17,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:17,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2050629420] [2021-11-23 16:48:17,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:17,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:17,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:17,499 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:17,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:48:18,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:18,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:18,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:18,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:18,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:18,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:18,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:48:18,449 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:48:18,919 INFO L354 Elim1Store]: treesize reduction 1124, result has 5.4 percent of original size [2021-11-23 16:48:18,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 72 treesize of output 74 [2021-11-23 16:48:19,429 INFO L354 Elim1Store]: treesize reduction 825, result has 7.2 percent of original size [2021-11-23 16:48:19,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 66 treesize of output 86 [2021-11-23 16:48:19,936 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:48:19,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 71 treesize of output 23 [2021-11-23 16:48:20,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:20,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:20,026 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:20,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2050629420] [2021-11-23 16:48:20,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2050629420] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:20,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:20,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:48:20,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795045228] [2021-11-23 16:48:20,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:20,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:20,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:20,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:20,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:20,031 INFO L87 Difference]: Start difference. First operand 139 states and 213 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:22,063 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:23,602 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:25,303 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:30,044 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:32,496 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:33,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:33,281 INFO L93 Difference]: Finished difference Result 296 states and 454 transitions. [2021-11-23 16:48:33,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:33,283 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:48:33,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:33,285 INFO L225 Difference]: With dead ends: 296 [2021-11-23 16:48:33,285 INFO L226 Difference]: Without dead ends: 167 [2021-11-23 16:48:33,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:48:33,289 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 22 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 8 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 479 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:33,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 479 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 148 Invalid, 2 Unknown, 0 Unchecked, 13.2s Time] [2021-11-23 16:48:33,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-23 16:48:33,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 150. [2021-11-23 16:48:33,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.5570469798657718) internal successors, (232), 149 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:33,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 232 transitions. [2021-11-23 16:48:33,306 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 232 transitions. Word has length 43 [2021-11-23 16:48:33,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:33,307 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 232 transitions. [2021-11-23 16:48:33,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:33,308 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 232 transitions. [2021-11-23 16:48:33,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 16:48:33,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:33,311 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:33,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 16:48:33,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:33,512 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:33,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:33,513 INFO L85 PathProgramCache]: Analyzing trace with hash -1636123909, now seen corresponding path program 1 times [2021-11-23 16:48:33,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:33,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1667718294] [2021-11-23 16:48:33,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:33,514 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:33,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:33,515 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:33,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:48:34,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:34,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 685 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:34,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:35,078 INFO L354 Elim1Store]: treesize reduction 1104, result has 5.5 percent of original size [2021-11-23 16:48:35,078 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:48:35,305 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:48:35,306 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:48:35,387 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:48:35,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:48:35,546 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:35,546 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:35,547 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:35,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1667718294] [2021-11-23 16:48:35,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1667718294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:35,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:35,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:48:35,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544471722] [2021-11-23 16:48:35,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:35,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:35,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:35,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:35,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:35,550 INFO L87 Difference]: Start difference. First operand 150 states and 232 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:37,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:42,654 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.71s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:44,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:44,255 INFO L93 Difference]: Finished difference Result 290 states and 446 transitions. [2021-11-23 16:48:44,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:44,257 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 16:48:44,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:44,258 INFO L225 Difference]: With dead ends: 290 [2021-11-23 16:48:44,258 INFO L226 Difference]: Without dead ends: 161 [2021-11-23 16:48:44,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:48:44,260 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 17 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:44,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 508 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 111 Invalid, 1 Unknown, 20 Unchecked, 8.7s Time] [2021-11-23 16:48:44,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-23 16:48:44,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 150. [2021-11-23 16:48:44,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.5503355704697988) internal successors, (231), 149 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:44,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 231 transitions. [2021-11-23 16:48:44,276 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 231 transitions. Word has length 56 [2021-11-23 16:48:44,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:44,277 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 231 transitions. [2021-11-23 16:48:44,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:44,278 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 231 transitions. [2021-11-23 16:48:44,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 16:48:44,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:44,281 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:44,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:44,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:44,491 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:44,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:44,492 INFO L85 PathProgramCache]: Analyzing trace with hash -301361520, now seen corresponding path program 1 times [2021-11-23 16:48:44,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:44,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [171644887] [2021-11-23 16:48:44,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:44,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:44,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:44,496 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:44,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:48:45,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:45,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:45,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:46,515 INFO L354 Elim1Store]: treesize reduction 1105, result has 5.5 percent of original size [2021-11-23 16:48:46,515 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:48:46,727 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:48:46,727 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:48:46,765 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:48:46,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:48:46,893 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:46,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:46,894 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:46,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [171644887] [2021-11-23 16:48:46,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [171644887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:46,894 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:46,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:48:46,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404227530] [2021-11-23 16:48:46,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:46,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:46,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:46,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:46,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:46,896 INFO L87 Difference]: Start difference. First operand 150 states and 231 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:48:48,914 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:51,190 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:51,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:51,420 INFO L93 Difference]: Finished difference Result 291 states and 449 transitions. [2021-11-23 16:48:51,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:51,422 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 16:48:51,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:51,424 INFO L225 Difference]: With dead ends: 291 [2021-11-23 16:48:51,424 INFO L226 Difference]: Without dead ends: 162 [2021-11-23 16:48:51,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:48:51,426 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 18 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:51,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 510 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 87 Invalid, 1 Unknown, 15 Unchecked, 4.5s Time] [2021-11-23 16:48:51,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-23 16:48:51,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2021-11-23 16:48:51,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.5341614906832297) internal successors, (247), 161 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:51,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 247 transitions. [2021-11-23 16:48:51,443 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 247 transitions. Word has length 57 [2021-11-23 16:48:51,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:51,443 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 247 transitions. [2021-11-23 16:48:51,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:48:51,444 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 247 transitions. [2021-11-23 16:48:51,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 16:48:51,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:51,447 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:51,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:51,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:51,666 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:51,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:51,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1304983516, now seen corresponding path program 1 times [2021-11-23 16:48:51,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:51,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [388647012] [2021-11-23 16:48:51,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:51,668 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:51,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:51,669 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:51,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:48:52,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:52,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:53,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:53,492 INFO L354 Elim1Store]: treesize reduction 1105, result has 5.5 percent of original size [2021-11-23 16:48:53,493 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:48:53,669 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:48:53,669 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:48:53,723 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:48:53,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:48:53,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:53,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:53,853 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:53,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [388647012] [2021-11-23 16:48:53,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [388647012] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:53,854 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:53,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:48:53,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399248776] [2021-11-23 16:48:53,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:53,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:48:53,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:53,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:48:53,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:48:53,857 INFO L87 Difference]: Start difference. First operand 162 states and 247 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:48:55,874 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:57,889 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:48:58,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:58,143 INFO L93 Difference]: Finished difference Result 304 states and 466 transitions. [2021-11-23 16:48:58,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:48:58,145 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 16:48:58,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:58,147 INFO L225 Difference]: With dead ends: 304 [2021-11-23 16:48:58,147 INFO L226 Difference]: Without dead ends: 163 [2021-11-23 16:48:58,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:48:58,149 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 18 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:58,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 531 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 88 Invalid, 1 Unknown, 16 Unchecked, 4.3s Time] [2021-11-23 16:48:58,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-23 16:48:58,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2021-11-23 16:48:58,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.5246913580246915) internal successors, (247), 162 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:58,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 247 transitions. [2021-11-23 16:48:58,161 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 247 transitions. Word has length 57 [2021-11-23 16:48:58,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:58,162 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 247 transitions. [2021-11-23 16:48:58,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:48:58,162 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 247 transitions. [2021-11-23 16:48:58,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 16:48:58,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:58,165 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:58,195 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 16:48:58,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:58,379 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:58,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:58,379 INFO L85 PathProgramCache]: Analyzing trace with hash 2122058939, now seen corresponding path program 1 times [2021-11-23 16:48:58,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:58,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1903687554] [2021-11-23 16:48:58,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:58,380 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:58,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:58,381 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:58,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:48:59,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:59,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:48:59,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:00,030 INFO L354 Elim1Store]: treesize reduction 1104, result has 5.5 percent of original size [2021-11-23 16:49:00,030 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:49:00,219 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:49:00,219 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:49:00,305 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:00,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:00,436 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:00,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:00,437 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:00,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1903687554] [2021-11-23 16:49:00,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1903687554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:00,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:00,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:00,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621781344] [2021-11-23 16:49:00,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:00,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:00,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:00,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:00,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:00,440 INFO L87 Difference]: Start difference. First operand 163 states and 247 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:49:02,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:03,769 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:08,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:08,789 INFO L93 Difference]: Finished difference Result 317 states and 480 transitions. [2021-11-23 16:49:08,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:08,791 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 16:49:08,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:08,793 INFO L225 Difference]: With dead ends: 317 [2021-11-23 16:49:08,793 INFO L226 Difference]: Without dead ends: 175 [2021-11-23 16:49:08,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:08,795 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 16 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:08,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 505 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 114 Invalid, 1 Unknown, 23 Unchecked, 8.3s Time] [2021-11-23 16:49:08,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-23 16:49:08,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 163. [2021-11-23 16:49:08,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.5185185185185186) internal successors, (246), 162 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:08,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 246 transitions. [2021-11-23 16:49:08,805 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 246 transitions. Word has length 57 [2021-11-23 16:49:08,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:08,806 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 246 transitions. [2021-11-23 16:49:08,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:49:08,806 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 246 transitions. [2021-11-23 16:49:08,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 16:49:08,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:08,809 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:08,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:09,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:09,034 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:09,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:09,035 INFO L85 PathProgramCache]: Analyzing trace with hash -1437563525, now seen corresponding path program 1 times [2021-11-23 16:49:09,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:09,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1285092760] [2021-11-23 16:49:09,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:09,036 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:09,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:09,038 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:09,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:49:10,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:10,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:10,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:10,625 INFO L354 Elim1Store]: treesize reduction 1104, result has 5.5 percent of original size [2021-11-23 16:49:10,625 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:49:10,780 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:49:10,780 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:49:10,848 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:10,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:10,969 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:10,969 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:10,969 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:10,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1285092760] [2021-11-23 16:49:10,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1285092760] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:10,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:10,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:10,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035150949] [2021-11-23 16:49:10,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:10,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:10,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:10,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:10,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:10,972 INFO L87 Difference]: Start difference. First operand 163 states and 246 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:49:12,987 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:18,771 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:19,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:19,124 INFO L93 Difference]: Finished difference Result 315 states and 477 transitions. [2021-11-23 16:49:19,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:19,127 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 16:49:19,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:19,128 INFO L225 Difference]: With dead ends: 315 [2021-11-23 16:49:19,128 INFO L226 Difference]: Without dead ends: 173 [2021-11-23 16:49:19,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:19,130 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 15 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:19,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 508 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 111 Invalid, 1 Unknown, 20 Unchecked, 8.1s Time] [2021-11-23 16:49:19,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-23 16:49:19,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 163. [2021-11-23 16:49:19,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.5123456790123457) internal successors, (245), 162 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:19,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 245 transitions. [2021-11-23 16:49:19,138 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 245 transitions. Word has length 57 [2021-11-23 16:49:19,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:19,139 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 245 transitions. [2021-11-23 16:49:19,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 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) [2021-11-23 16:49:19,139 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 245 transitions. [2021-11-23 16:49:19,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 16:49:19,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:19,141 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:19,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:19,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:19,350 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:19,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:19,351 INFO L85 PathProgramCache]: Analyzing trace with hash -199560092, now seen corresponding path program 1 times [2021-11-23 16:49:19,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:19,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [99770324] [2021-11-23 16:49:19,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:19,352 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:19,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:19,353 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:19,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:49:20,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:20,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:20,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:21,193 INFO L354 Elim1Store]: treesize reduction 1105, result has 5.5 percent of original size [2021-11-23 16:49:21,194 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:49:21,370 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:49:21,371 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:49:21,446 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:21,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:21,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:21,609 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:21,609 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:21,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [99770324] [2021-11-23 16:49:21,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [99770324] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:21,609 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:21,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:21,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880721244] [2021-11-23 16:49:21,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:21,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:21,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:21,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:21,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:21,611 INFO L87 Difference]: Start difference. First operand 163 states and 245 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:23,643 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:25,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:25,908 INFO L93 Difference]: Finished difference Result 306 states and 465 transitions. [2021-11-23 16:49:25,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:25,910 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-23 16:49:25,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:25,911 INFO L225 Difference]: With dead ends: 306 [2021-11-23 16:49:25,911 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 16:49:25,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:25,912 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 18 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:25,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 508 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 89 Invalid, 1 Unknown, 17 Unchecked, 4.3s Time] [2021-11-23 16:49:25,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 16:49:25,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-11-23 16:49:25,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 1.5030674846625767) internal successors, (245), 163 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:25,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 245 transitions. [2021-11-23 16:49:25,921 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 245 transitions. Word has length 58 [2021-11-23 16:49:25,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:25,921 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 245 transitions. [2021-11-23 16:49:25,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:25,921 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 245 transitions. [2021-11-23 16:49:25,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 16:49:25,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:25,923 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:25,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:26,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:26,130 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:26,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:26,130 INFO L85 PathProgramCache]: Analyzing trace with hash -204940119, now seen corresponding path program 1 times [2021-11-23 16:49:26,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:26,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1976005416] [2021-11-23 16:49:26,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:26,131 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:26,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:26,132 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:26,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:49:27,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:27,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:27,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:27,871 INFO L354 Elim1Store]: treesize reduction 1105, result has 5.5 percent of original size [2021-11-23 16:49:27,872 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:49:28,045 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:49:28,046 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:49:28,107 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:28,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:28,258 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:28,258 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:28,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:28,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1976005416] [2021-11-23 16:49:28,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1976005416] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:28,258 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:28,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:28,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627738285] [2021-11-23 16:49:28,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:28,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:28,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:28,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:28,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:28,260 INFO L87 Difference]: Start difference. First operand 164 states and 245 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:30,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:32,844 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.63s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:33,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:33,106 INFO L93 Difference]: Finished difference Result 308 states and 466 transitions. [2021-11-23 16:49:33,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:33,108 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-23 16:49:33,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:33,109 INFO L225 Difference]: With dead ends: 308 [2021-11-23 16:49:33,110 INFO L226 Difference]: Without dead ends: 165 [2021-11-23 16:49:33,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:33,111 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 18 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:33,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 500 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 90 Invalid, 1 Unknown, 18 Unchecked, 4.8s Time] [2021-11-23 16:49:33,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-23 16:49:33,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2021-11-23 16:49:33,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.4939024390243902) internal successors, (245), 164 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:33,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 245 transitions. [2021-11-23 16:49:33,119 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 245 transitions. Word has length 59 [2021-11-23 16:49:33,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:33,120 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 245 transitions. [2021-11-23 16:49:33,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:33,120 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 245 transitions. [2021-11-23 16:49:33,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 16:49:33,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:33,122 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:33,147 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Ended with exit code 0 [2021-11-23 16:49:33,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:33,335 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:33,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:33,335 INFO L85 PathProgramCache]: Analyzing trace with hash -285488759, now seen corresponding path program 1 times [2021-11-23 16:49:33,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:33,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [368299413] [2021-11-23 16:49:33,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:33,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:33,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:33,337 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:33,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:49:34,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:34,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:49:34,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:35,206 INFO L354 Elim1Store]: treesize reduction 1105, result has 5.5 percent of original size [2021-11-23 16:49:35,206 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 7 case distinctions, treesize of input 69 treesize of output 73 [2021-11-23 16:49:35,433 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:49:35,433 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:49:35,509 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:35,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:35,657 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:35,657 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:35,657 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:35,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [368299413] [2021-11-23 16:49:35,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [368299413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:35,657 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:35,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:35,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987713630] [2021-11-23 16:49:35,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:35,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:35,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:35,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:35,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:35,659 INFO L87 Difference]: Start difference. First operand 165 states and 245 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:37,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:39,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:39,695 INFO L93 Difference]: Finished difference Result 310 states and 467 transitions. [2021-11-23 16:49:39,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:39,697 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 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 60 [2021-11-23 16:49:39,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:39,699 INFO L225 Difference]: With dead ends: 310 [2021-11-23 16:49:39,699 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 16:49:39,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:39,700 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 18 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 21 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:39,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 498 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 91 Invalid, 1 Unknown, 19 Unchecked, 4.0s Time] [2021-11-23 16:49:39,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 16:49:39,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2021-11-23 16:49:39,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.4848484848484849) internal successors, (245), 165 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:39,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 245 transitions. [2021-11-23 16:49:39,709 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 245 transitions. Word has length 60 [2021-11-23 16:49:39,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:39,709 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 245 transitions. [2021-11-23 16:49:39,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:39,710 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 245 transitions. [2021-11-23 16:49:39,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 16:49:39,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:39,711 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:39,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:39,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:39,927 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:39,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:39,927 INFO L85 PathProgramCache]: Analyzing trace with hash 844599537, now seen corresponding path program 1 times [2021-11-23 16:49:39,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:39,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [280461094] [2021-11-23 16:49:39,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:39,928 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:39,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:39,929 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:39,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:49:41,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:41,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:41,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:41,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:41,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:41,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:41,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:41,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:49:41,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:49:41,582 INFO L354 Elim1Store]: treesize reduction 1109, result has 5.5 percent of original size [2021-11-23 16:49:41,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 52 treesize of output 73 [2021-11-23 16:49:42,146 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:42,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 70 treesize of output 22 [2021-11-23 16:49:42,238 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:42,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:42,239 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:42,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [280461094] [2021-11-23 16:49:42,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [280461094] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:42,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:42,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:42,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497887820] [2021-11-23 16:49:42,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:42,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:42,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:42,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:42,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:42,242 INFO L87 Difference]: Start difference. First operand 166 states and 245 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:44,272 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:48,788 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:52,258 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:53,808 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:49:54,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:54,624 INFO L93 Difference]: Finished difference Result 343 states and 513 transitions. [2021-11-23 16:49:54,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:49:54,627 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 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 60 [2021-11-23 16:49:54,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:54,628 INFO L225 Difference]: With dead ends: 343 [2021-11-23 16:49:54,628 INFO L226 Difference]: Without dead ends: 198 [2021-11-23 16:49:54,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:49:54,629 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 22 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:54,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 517 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 150 Invalid, 1 Unknown, 0 Unchecked, 12.3s Time] [2021-11-23 16:49:54,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-23 16:49:54,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 188. [2021-11-23 16:49:54,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 1.4866310160427807) internal successors, (278), 187 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:54,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 278 transitions. [2021-11-23 16:49:54,639 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 278 transitions. Word has length 60 [2021-11-23 16:49:54,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:54,640 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 278 transitions. [2021-11-23 16:49:54,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:54,640 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 278 transitions. [2021-11-23 16:49:54,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 16:49:54,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:54,642 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:54,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:54,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:54,858 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:54,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:54,858 INFO L85 PathProgramCache]: Analyzing trace with hash -1334074737, now seen corresponding path program 1 times [2021-11-23 16:49:54,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:54,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1186000444] [2021-11-23 16:49:54,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:54,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:54,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:54,860 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:54,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 16:49:56,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:56,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 767 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:49:56,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:56,613 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:49:56,613 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:49:56,687 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:49:56,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:49:56,809 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:56,809 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:56,809 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:56,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1186000444] [2021-11-23 16:49:56,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1186000444] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:56,810 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:49:56,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:49:56,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386022206] [2021-11-23 16:49:56,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:56,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:49:56,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:56,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:49:56,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:49:56,811 INFO L87 Difference]: Start difference. First operand 188 states and 278 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) [2021-11-23 16:49:58,829 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:03,257 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:05,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:05,020 INFO L93 Difference]: Finished difference Result 355 states and 532 transitions. [2021-11-23 16:50:05,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:50:05,022 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) Word has length 73 [2021-11-23 16:50:05,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:05,023 INFO L225 Difference]: With dead ends: 355 [2021-11-23 16:50:05,024 INFO L226 Difference]: Without dead ends: 188 [2021-11-23 16:50:05,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:05,025 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 10 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:05,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 533 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 1 Unknown, 16 Unchecked, 8.2s Time] [2021-11-23 16:50:05,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-23 16:50:05,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2021-11-23 16:50:05,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 1.481283422459893) internal successors, (277), 187 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:05,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 277 transitions. [2021-11-23 16:50:05,035 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 277 transitions. Word has length 73 [2021-11-23 16:50:05,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:05,035 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 277 transitions. [2021-11-23 16:50:05,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) [2021-11-23 16:50:05,036 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 277 transitions. [2021-11-23 16:50:05,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 16:50:05,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:05,037 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:05,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:05,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:05,250 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:05,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:05,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1399318617, now seen corresponding path program 1 times [2021-11-23 16:50:05,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:05,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [365090525] [2021-11-23 16:50:05,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:05,252 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:05,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:05,253 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:05,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:50:06,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:06,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:50:06,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:07,049 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:50:07,050 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:50:07,149 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:50:07,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:50:07,274 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 34 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:07,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:07,274 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:07,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [365090525] [2021-11-23 16:50:07,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [365090525] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:07,274 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:07,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:50:07,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437252932] [2021-11-23 16:50:07,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:07,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:50:07,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:07,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:50:07,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:50:07,276 INFO L87 Difference]: Start difference. First operand 188 states and 277 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:09,295 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:10,997 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:12,699 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:15,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:18,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:18,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:18,799 INFO L93 Difference]: Finished difference Result 357 states and 532 transitions. [2021-11-23 16:50:18,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:50:18,802 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-23 16:50:18,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:18,804 INFO L225 Difference]: With dead ends: 357 [2021-11-23 16:50:18,804 INFO L226 Difference]: Without dead ends: 190 [2021-11-23 16:50:18,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:18,805 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 11 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:18,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 525 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 111 Invalid, 2 Unknown, 18 Unchecked, 11.5s Time] [2021-11-23 16:50:18,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-23 16:50:18,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 188. [2021-11-23 16:50:18,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 1.4759358288770053) internal successors, (276), 187 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:18,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 276 transitions. [2021-11-23 16:50:18,813 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 276 transitions. Word has length 74 [2021-11-23 16:50:18,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:18,814 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 276 transitions. [2021-11-23 16:50:18,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:18,814 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 276 transitions. [2021-11-23 16:50:18,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 16:50:18,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:18,816 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:18,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:19,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:19,038 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:19,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:19,039 INFO L85 PathProgramCache]: Analyzing trace with hash -663973785, now seen corresponding path program 1 times [2021-11-23 16:50:19,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:19,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [510371784] [2021-11-23 16:50:19,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:19,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:19,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:19,040 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:19,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:50:20,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:20,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:50:20,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:20,831 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:50:20,832 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:50:20,920 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:50:20,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:50:21,036 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:21,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:21,036 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:21,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [510371784] [2021-11-23 16:50:21,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [510371784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:21,037 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:21,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:50:21,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786528964] [2021-11-23 16:50:21,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:21,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:50:21,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:21,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:50:21,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:50:21,038 INFO L87 Difference]: Start difference. First operand 188 states and 276 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:23,054 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:27,762 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:29,813 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:30,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:30,259 INFO L93 Difference]: Finished difference Result 355 states and 528 transitions. [2021-11-23 16:50:30,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:50:30,261 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-23 16:50:30,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:30,263 INFO L225 Difference]: With dead ends: 355 [2021-11-23 16:50:30,263 INFO L226 Difference]: Without dead ends: 188 [2021-11-23 16:50:30,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:30,265 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 10 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:30,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 529 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 109 Invalid, 1 Unknown, 15 Unchecked, 9.2s Time] [2021-11-23 16:50:30,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-23 16:50:30,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2021-11-23 16:50:30,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 1.4705882352941178) internal successors, (275), 187 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:30,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 275 transitions. [2021-11-23 16:50:30,273 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 275 transitions. Word has length 74 [2021-11-23 16:50:30,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:30,273 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 275 transitions. [2021-11-23 16:50:30,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:30,274 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 275 transitions. [2021-11-23 16:50:30,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:50:30,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:30,275 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:30,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:30,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:30,499 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:30,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:30,499 INFO L85 PathProgramCache]: Analyzing trace with hash 1394397078, now seen corresponding path program 1 times [2021-11-23 16:50:30,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:30,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [845391440] [2021-11-23 16:50:30,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:30,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:30,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:30,502 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:30,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 16:50:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:31,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:50:31,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:32,159 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:50:32,160 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:50:32,358 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:50:32,358 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:50:32,565 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:50:32,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:50:32,593 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:50:32,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:32,594 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:32,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [845391440] [2021-11-23 16:50:32,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [845391440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:32,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:32,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:50:32,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617726203] [2021-11-23 16:50:32,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:32,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:50:32,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:32,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:50:32,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:50:32,595 INFO L87 Difference]: Start difference. First operand 188 states and 275 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:34,614 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:37,253 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:40,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:43,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:43,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:43,620 INFO L93 Difference]: Finished difference Result 437 states and 654 transitions. [2021-11-23 16:50:43,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:50:43,623 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 16:50:43,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:43,625 INFO L225 Difference]: With dead ends: 437 [2021-11-23 16:50:43,625 INFO L226 Difference]: Without dead ends: 270 [2021-11-23 16:50:43,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:43,627 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 70 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:43,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 487 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 161 Invalid, 2 Unknown, 67 Unchecked, 11.0s Time] [2021-11-23 16:50:43,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-23 16:50:43,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 228. [2021-11-23 16:50:43,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 227 states have (on average 1.5110132158590308) internal successors, (343), 227 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) [2021-11-23 16:50:43,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 343 transitions. [2021-11-23 16:50:43,637 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 343 transitions. Word has length 82 [2021-11-23 16:50:43,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:43,637 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 343 transitions. [2021-11-23 16:50:43,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:43,638 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 343 transitions. [2021-11-23 16:50:43,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:50:43,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:43,640 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:43,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:43,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:43,855 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:43,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:43,855 INFO L85 PathProgramCache]: Analyzing trace with hash -450970088, now seen corresponding path program 1 times [2021-11-23 16:50:43,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:43,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1903161276] [2021-11-23 16:50:43,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:43,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:43,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:43,857 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:43,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:50:45,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:45,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:50:45,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:45,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:45,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:45,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:45,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:45,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:50:45,220 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:50:45,314 INFO L354 Elim1Store]: treesize reduction 190, result has 12.8 percent of original size [2021-11-23 16:50:45,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 38 [2021-11-23 16:50:45,722 INFO L354 Elim1Store]: treesize reduction 825, result has 7.2 percent of original size [2021-11-23 16:50:45,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 66 treesize of output 86 [2021-11-23 16:50:46,240 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:50:46,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 71 treesize of output 23 [2021-11-23 16:50:46,303 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:50:46,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:46,304 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:46,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1903161276] [2021-11-23 16:50:46,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1903161276] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:46,304 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:46,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:50:46,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58095068] [2021-11-23 16:50:46,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:46,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:50:46,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:46,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:50:46,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:50:46,312 INFO L87 Difference]: Start difference. First operand 228 states and 343 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:48,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:51,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:52,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:54,524 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:55,639 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:50:58,241 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:00,438 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:01,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:01,217 INFO L93 Difference]: Finished difference Result 474 states and 720 transitions. [2021-11-23 16:51:01,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:01,220 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 16:51:01,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:01,222 INFO L225 Difference]: With dead ends: 474 [2021-11-23 16:51:01,222 INFO L226 Difference]: Without dead ends: 267 [2021-11-23 16:51:01,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:01,223 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 30 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:01,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 591 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 166 Invalid, 1 Unknown, 0 Unchecked, 14.9s Time] [2021-11-23 16:51:01,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-23 16:51:01,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 252. [2021-11-23 16:51:01,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 1.5139442231075697) internal successors, (380), 251 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:01,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 380 transitions. [2021-11-23 16:51:01,233 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 380 transitions. Word has length 82 [2021-11-23 16:51:01,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:01,234 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 380 transitions. [2021-11-23 16:51:01,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:01,234 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 380 transitions. [2021-11-23 16:51:01,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 16:51:01,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:01,235 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:01,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-11-23 16:51:01,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:01,460 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:01,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:01,460 INFO L85 PathProgramCache]: Analyzing trace with hash 268852943, now seen corresponding path program 1 times [2021-11-23 16:51:01,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:01,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [274974329] [2021-11-23 16:51:01,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:01,461 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:01,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:01,462 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:01,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:51:02,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:02,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:02,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:02,990 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:51:02,990 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:51:03,221 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:51:03,221 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:51:03,478 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:51:03,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:51:03,514 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:03,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:03,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:03,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [274974329] [2021-11-23 16:51:03,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [274974329] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:03,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:03,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:51:03,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373980400] [2021-11-23 16:51:03,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:03,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:03,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:03,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:03,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:03,516 INFO L87 Difference]: Start difference. First operand 252 states and 380 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) [2021-11-23 16:51:05,540 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:14,557 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:15,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:15,174 INFO L93 Difference]: Finished difference Result 526 states and 797 transitions. [2021-11-23 16:51:15,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:15,175 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) Word has length 83 [2021-11-23 16:51:15,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:15,177 INFO L225 Difference]: With dead ends: 526 [2021-11-23 16:51:15,177 INFO L226 Difference]: Without dead ends: 295 [2021-11-23 16:51:15,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:15,178 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 70 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:15,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 528 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 163 Invalid, 2 Unknown, 69 Unchecked, 11.6s Time] [2021-11-23 16:51:15,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-23 16:51:15,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 253. [2021-11-23 16:51:15,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.5119047619047619) internal successors, (381), 252 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:15,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 381 transitions. [2021-11-23 16:51:15,188 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 381 transitions. Word has length 83 [2021-11-23 16:51:15,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:15,189 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 381 transitions. [2021-11-23 16:51:15,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 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) [2021-11-23 16:51:15,189 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 381 transitions. [2021-11-23 16:51:15,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 16:51:15,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:15,191 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:15,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:15,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:15,415 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:15,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:15,415 INFO L85 PathProgramCache]: Analyzing trace with hash 43915274, now seen corresponding path program 1 times [2021-11-23 16:51:15,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:15,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737137581] [2021-11-23 16:51:15,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:15,416 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:15,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:15,417 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:15,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 16:51:16,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:17,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:17,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:17,271 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:51:17,271 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:51:17,445 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:51:17,445 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:51:17,527 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:51:17,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:51:17,675 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:17,675 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:17,675 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:17,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737137581] [2021-11-23 16:51:17,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737137581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:17,676 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:17,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:51:17,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446482337] [2021-11-23 16:51:17,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:17,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:17,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:17,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:17,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:17,678 INFO L87 Difference]: Start difference. First operand 253 states and 381 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:19,706 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:22,420 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:24,227 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:26,342 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:26,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:26,785 INFO L93 Difference]: Finished difference Result 485 states and 738 transitions. [2021-11-23 16:51:26,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:26,787 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-23 16:51:26,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:26,788 INFO L225 Difference]: With dead ends: 485 [2021-11-23 16:51:26,788 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 16:51:26,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:26,790 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:26,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 554 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 2 Unknown, 16 Unchecked, 9.1s Time] [2021-11-23 16:51:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 16:51:26,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-23 16:51:26,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.507936507936508) internal successors, (380), 252 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:26,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 380 transitions. [2021-11-23 16:51:26,800 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 380 transitions. Word has length 95 [2021-11-23 16:51:26,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:26,800 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 380 transitions. [2021-11-23 16:51:26,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:26,801 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 380 transitions. [2021-11-23 16:51:26,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 16:51:26,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:26,802 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:26,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:27,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:27,027 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:27,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:27,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1582255304, now seen corresponding path program 1 times [2021-11-23 16:51:27,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:27,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [344561107] [2021-11-23 16:51:27,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:27,028 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:27,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:27,029 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:27,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:51:28,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:28,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:28,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:28,886 INFO L354 Elim1Store]: treesize reduction 182, result has 13.3 percent of original size [2021-11-23 16:51:28,887 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 3 case distinctions, treesize of input 29 treesize of output 37 [2021-11-23 16:51:29,059 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:51:29,059 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:51:29,124 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:51:29,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:51:29,247 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:29,248 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:29,248 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:29,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [344561107] [2021-11-23 16:51:29,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [344561107] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:29,249 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:29,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:51:29,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671664644] [2021-11-23 16:51:29,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:29,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:29,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:29,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:29,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:29,251 INFO L87 Difference]: Start difference. First operand 253 states and 380 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:31,271 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:35,505 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:37,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:37,938 INFO L93 Difference]: Finished difference Result 485 states and 736 transitions. [2021-11-23 16:51:37,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:37,940 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-23 16:51:37,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:37,942 INFO L225 Difference]: With dead ends: 485 [2021-11-23 16:51:37,942 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 16:51:37,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:37,944 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:37,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 109 Invalid, 1 Unknown, 15 Unchecked, 8.7s Time] [2021-11-23 16:51:37,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 16:51:37,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-23 16:51:37,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.503968253968254) internal successors, (379), 252 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:37,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 379 transitions. [2021-11-23 16:51:37,954 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 379 transitions. Word has length 95 [2021-11-23 16:51:37,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:37,954 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 379 transitions. [2021-11-23 16:51:37,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:37,955 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 379 transitions. [2021-11-23 16:51:37,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 16:51:37,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:37,956 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:38,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:38,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:38,184 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:38,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:38,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1631301236, now seen corresponding path program 1 times [2021-11-23 16:51:38,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:38,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236869331] [2021-11-23 16:51:38,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:38,185 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:38,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:38,186 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:38,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:51:39,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:39,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 786 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:39,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:39,860 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:51:39,860 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:51:40,106 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:51:40,106 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:51:40,205 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:51:40,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:51:40,346 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:40,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:40,347 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:40,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236869331] [2021-11-23 16:51:40,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236869331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:40,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:40,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:51:40,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405336231] [2021-11-23 16:51:40,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:40,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:40,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:40,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:40,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:40,349 INFO L87 Difference]: Start difference. First operand 253 states and 379 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:42,377 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:45,496 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:47,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:50,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:51:50,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:50,812 INFO L93 Difference]: Finished difference Result 487 states and 736 transitions. [2021-11-23 16:51:50,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:51:50,814 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 16:51:50,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:50,816 INFO L225 Difference]: With dead ends: 487 [2021-11-23 16:51:50,816 INFO L226 Difference]: Without dead ends: 255 [2021-11-23 16:51:50,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:51:50,818 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 11 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:50,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 549 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 113 Invalid, 1 Unknown, 21 Unchecked, 10.4s Time] [2021-11-23 16:51:50,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-23 16:51:50,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 253. [2021-11-23 16:51:50,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.5) internal successors, (378), 252 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:50,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 378 transitions. [2021-11-23 16:51:50,828 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 378 transitions. Word has length 96 [2021-11-23 16:51:50,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:50,828 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 378 transitions. [2021-11-23 16:51:50,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:50,829 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 378 transitions. [2021-11-23 16:51:50,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 16:51:50,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:50,830 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:50,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:51,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,059 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:51,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:51,059 INFO L85 PathProgramCache]: Analyzing trace with hash -895956404, now seen corresponding path program 1 times [2021-11-23 16:51:51,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:51,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [31631754] [2021-11-23 16:51:51,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:51,060 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:51,062 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:51,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 16:51:52,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:52,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:51:52,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:53,049 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:51:53,049 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:51:53,268 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:51:53,269 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:51:53,343 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:51:53,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:51:53,509 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:53,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:53,509 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:53,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [31631754] [2021-11-23 16:51:53,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [31631754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:53,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:53,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:51:53,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215943623] [2021-11-23 16:51:53,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:53,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:51:53,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:53,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:51:53,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:51:53,511 INFO L87 Difference]: Start difference. First operand 253 states and 378 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:55,539 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:00,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:00,910 INFO L93 Difference]: Finished difference Result 485 states and 732 transitions. [2021-11-23 16:52:00,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:00,912 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 16:52:00,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:00,913 INFO L225 Difference]: With dead ends: 485 [2021-11-23 16:52:00,914 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 16:52:00,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:00,915 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 10 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:00,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 553 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 110 Invalid, 1 Unknown, 17 Unchecked, 7.4s Time] [2021-11-23 16:52:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 16:52:00,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-23 16:52:00,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.496031746031746) internal successors, (377), 252 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:00,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 377 transitions. [2021-11-23 16:52:00,924 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 377 transitions. Word has length 96 [2021-11-23 16:52:00,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:00,924 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 377 transitions. [2021-11-23 16:52:00,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:00,925 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 377 transitions. [2021-11-23 16:52:00,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 16:52:00,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:00,926 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:00,958 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-11-23 16:52:01,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:01,141 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:01,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:01,141 INFO L85 PathProgramCache]: Analyzing trace with hash -1187400562, now seen corresponding path program 1 times [2021-11-23 16:52:01,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:01,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1972237798] [2021-11-23 16:52:01,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:01,142 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:01,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:01,143 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:01,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:52:02,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:02,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 786 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:02,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:02,865 INFO L354 Elim1Store]: treesize reduction 182, result has 13.3 percent of original size [2021-11-23 16:52:02,865 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 3 case distinctions, treesize of input 29 treesize of output 37 [2021-11-23 16:52:03,076 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:52:03,077 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:52:03,167 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:52:03,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:52:03,316 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:03,317 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:03,317 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:03,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1972237798] [2021-11-23 16:52:03,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1972237798] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:03,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:03,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:03,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219946565] [2021-11-23 16:52:03,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:03,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:03,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:03,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:03,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:03,319 INFO L87 Difference]: Start difference. First operand 253 states and 377 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:05,348 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:08,046 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:11,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:11,740 INFO L93 Difference]: Finished difference Result 487 states and 732 transitions. [2021-11-23 16:52:11,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:11,742 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 16:52:11,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:11,744 INFO L225 Difference]: With dead ends: 487 [2021-11-23 16:52:11,745 INFO L226 Difference]: Without dead ends: 255 [2021-11-23 16:52:11,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:11,746 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 11 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:11,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 553 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 113 Invalid, 1 Unknown, 19 Unchecked, 8.4s Time] [2021-11-23 16:52:11,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-23 16:52:11,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 253. [2021-11-23 16:52:11,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.492063492063492) internal successors, (376), 252 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:11,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 376 transitions. [2021-11-23 16:52:11,755 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 376 transitions. Word has length 96 [2021-11-23 16:52:11,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:11,756 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 376 transitions. [2021-11-23 16:52:11,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:11,756 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 376 transitions. [2021-11-23 16:52:11,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 16:52:11,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:11,757 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:11,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:11,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:11,963 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:11,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:11,963 INFO L85 PathProgramCache]: Analyzing trace with hash -452055730, now seen corresponding path program 1 times [2021-11-23 16:52:11,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:11,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [503599173] [2021-11-23 16:52:11,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:11,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:11,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:11,965 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:11,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:52:13,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:13,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:13,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:13,958 INFO L354 Elim1Store]: treesize reduction 182, result has 13.3 percent of original size [2021-11-23 16:52:13,958 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 3 case distinctions, treesize of input 29 treesize of output 37 [2021-11-23 16:52:14,192 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:52:14,193 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 4 case distinctions, treesize of input 38 treesize of output 49 [2021-11-23 16:52:14,272 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:52:14,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:52:14,393 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:14,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:14,393 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:14,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [503599173] [2021-11-23 16:52:14,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [503599173] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:14,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:14,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:14,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419961548] [2021-11-23 16:52:14,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:14,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:14,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:14,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:14,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:14,395 INFO L87 Difference]: Start difference. First operand 253 states and 376 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:16,414 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:19,898 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.71s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:22,394 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:23,760 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:24,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:24,623 INFO L93 Difference]: Finished difference Result 485 states and 728 transitions. [2021-11-23 16:52:24,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:24,625 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-23 16:52:24,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:24,627 INFO L225 Difference]: With dead ends: 485 [2021-11-23 16:52:24,627 INFO L226 Difference]: Without dead ends: 253 [2021-11-23 16:52:24,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:24,628 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:24,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 110 Invalid, 1 Unknown, 17 Unchecked, 10.2s Time] [2021-11-23 16:52:24,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-23 16:52:24,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-23 16:52:24,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.4880952380952381) internal successors, (375), 252 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:24,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 375 transitions. [2021-11-23 16:52:24,638 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 375 transitions. Word has length 96 [2021-11-23 16:52:24,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:24,638 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 375 transitions. [2021-11-23 16:52:24,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:24,639 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 375 transitions. [2021-11-23 16:52:24,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 16:52:24,640 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:24,640 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:24,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:24,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:24,855 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:24,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:24,855 INFO L85 PathProgramCache]: Analyzing trace with hash -311631703, now seen corresponding path program 1 times [2021-11-23 16:52:24,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:24,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2123936051] [2021-11-23 16:52:24,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:24,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:24,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:24,857 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:24,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 16:52:26,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:26,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:26,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:26,882 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:52:26,882 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:52:27,072 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:52:27,073 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:52:27,185 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:52:27,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:52:27,309 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:27,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:27,309 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:27,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2123936051] [2021-11-23 16:52:27,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2123936051] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:27,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:27,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:27,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96603098] [2021-11-23 16:52:27,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:27,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:27,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:27,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:27,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:27,312 INFO L87 Difference]: Start difference. First operand 253 states and 375 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:29,347 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:32,640 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.75s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:34,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:36,594 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:37,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:37,576 INFO L93 Difference]: Finished difference Result 492 states and 736 transitions. [2021-11-23 16:52:37,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:37,578 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 16:52:37,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:37,579 INFO L225 Difference]: With dead ends: 492 [2021-11-23 16:52:37,579 INFO L226 Difference]: Without dead ends: 260 [2021-11-23 16:52:37,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:37,581 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 21 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:37,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 569 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 122 Invalid, 2 Unknown, 28 Unchecked, 10.2s Time] [2021-11-23 16:52:37,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-23 16:52:37,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 253. [2021-11-23 16:52:37,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.4841269841269842) internal successors, (374), 252 states have internal predecessors, (374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:37,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 374 transitions. [2021-11-23 16:52:37,590 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 374 transitions. Word has length 104 [2021-11-23 16:52:37,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:37,591 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 374 transitions. [2021-11-23 16:52:37,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:37,591 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 374 transitions. [2021-11-23 16:52:37,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 16:52:37,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:37,593 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:37,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:37,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:37,819 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:37,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:37,819 INFO L85 PathProgramCache]: Analyzing trace with hash 1649942955, now seen corresponding path program 1 times [2021-11-23 16:52:37,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:37,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1909447283] [2021-11-23 16:52:37,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:37,820 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:37,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:37,821 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:37,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 16:52:39,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:39,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:39,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:39,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:52:39,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:52:39,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:52:39,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:52:39,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:52:39,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:52:40,095 INFO L354 Elim1Store]: treesize reduction 1109, result has 5.5 percent of original size [2021-11-23 16:52:40,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 52 treesize of output 73 [2021-11-23 16:52:40,725 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:52:40,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 70 treesize of output 22 [2021-11-23 16:52:40,784 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:52:40,785 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:40,785 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:40,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1909447283] [2021-11-23 16:52:40,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1909447283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:40,786 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:40,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:40,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208980966] [2021-11-23 16:52:40,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:40,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:40,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:40,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:40,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:40,788 INFO L87 Difference]: Start difference. First operand 253 states and 374 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:42,819 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:46,713 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.63s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:50,672 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:52:53,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:53,054 INFO L93 Difference]: Finished difference Result 528 states and 789 transitions. [2021-11-23 16:52:53,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:53,056 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 16:52:53,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:53,059 INFO L225 Difference]: With dead ends: 528 [2021-11-23 16:52:53,059 INFO L226 Difference]: Without dead ends: 296 [2021-11-23 16:52:53,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:52:53,061 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 33 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:53,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 583 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 174 Invalid, 1 Unknown, 0 Unchecked, 12.2s Time] [2021-11-23 16:52:53,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-23 16:52:53,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 279. [2021-11-23 16:52:53,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4928057553956835) internal successors, (415), 278 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:53,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 415 transitions. [2021-11-23 16:52:53,072 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 415 transitions. Word has length 104 [2021-11-23 16:52:53,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:53,073 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 415 transitions. [2021-11-23 16:52:53,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:53,073 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 415 transitions. [2021-11-23 16:52:53,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 16:52:53,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:53,075 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:53,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:53,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:53,291 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:53,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:53,291 INFO L85 PathProgramCache]: Analyzing trace with hash -93607129, now seen corresponding path program 1 times [2021-11-23 16:52:53,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:53,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [833844581] [2021-11-23 16:52:53,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:53,293 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:53,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:53,294 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:53,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:52:55,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:55,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:55,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:55,359 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:52:55,360 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:52:55,534 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:52:55,534 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:52:55,681 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:52:55,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:52:55,818 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:55,818 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:55,818 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:55,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [833844581] [2021-11-23 16:52:55,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [833844581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:55,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:55,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:55,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713914916] [2021-11-23 16:52:55,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:55,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:55,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:55,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:55,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:55,821 INFO L87 Difference]: Start difference. First operand 279 states and 415 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:57,840 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:04,169 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:05,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:05,010 INFO L93 Difference]: Finished difference Result 551 states and 826 transitions. [2021-11-23 16:53:05,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:53:05,012 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2021-11-23 16:53:05,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:05,013 INFO L225 Difference]: With dead ends: 551 [2021-11-23 16:53:05,013 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 16:53:05,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:53:05,015 INFO L933 BasicCegarLoop]: 226 mSDtfsCounter, 31 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 572 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:05,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 572 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 133 Invalid, 1 Unknown, 37 Unchecked, 9.2s Time] [2021-11-23 16:53:05,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 16:53:05,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 279. [2021-11-23 16:53:05,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4892086330935252) internal successors, (414), 278 states have internal predecessors, (414), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:05,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 414 transitions. [2021-11-23 16:53:05,025 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 414 transitions. Word has length 107 [2021-11-23 16:53:05,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:05,025 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 414 transitions. [2021-11-23 16:53:05,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:05,026 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 414 transitions. [2021-11-23 16:53:05,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 16:53:05,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:05,027 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:05,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:05,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:05,246 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:05,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:05,246 INFO L85 PathProgramCache]: Analyzing trace with hash 751969961, now seen corresponding path program 1 times [2021-11-23 16:53:05,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:05,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [453479712] [2021-11-23 16:53:05,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:05,247 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:05,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:05,248 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:05,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:53:06,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:07,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 833 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:53:07,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:07,173 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:53:07,173 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:53:07,348 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:53:07,348 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:53:07,512 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:53:07,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:53:07,647 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:53:07,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:07,648 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:07,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [453479712] [2021-11-23 16:53:07,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [453479712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:07,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:07,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:53:07,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762565167] [2021-11-23 16:53:07,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:07,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:53:07,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:07,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:53:07,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:53:07,650 INFO L87 Difference]: Start difference. First operand 279 states and 414 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:09,668 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:13,470 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:15,864 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:19,345 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:19,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:19,394 INFO L93 Difference]: Finished difference Result 551 states and 824 transitions. [2021-11-23 16:53:19,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:53:19,396 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-23 16:53:19,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:19,398 INFO L225 Difference]: With dead ends: 551 [2021-11-23 16:53:19,398 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 16:53:19,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:53:19,399 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 31 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 4 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 11.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:19,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 561 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 132 Invalid, 3 Unknown, 38 Unchecked, 11.7s Time] [2021-11-23 16:53:19,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 16:53:19,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 279. [2021-11-23 16:53:19,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.485611510791367) internal successors, (413), 278 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:19,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 413 transitions. [2021-11-23 16:53:19,410 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 413 transitions. Word has length 108 [2021-11-23 16:53:19,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:19,410 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 413 transitions. [2021-11-23 16:53:19,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:19,411 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 413 transitions. [2021-11-23 16:53:19,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 16:53:19,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:19,413 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:19,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:19,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:19,631 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:19,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:19,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1519463207, now seen corresponding path program 1 times [2021-11-23 16:53:19,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:19,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [773042651] [2021-11-23 16:53:19,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:19,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:19,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:19,633 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:19,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:53:21,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:21,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:53:21,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:21,747 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:53:21,747 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:53:21,954 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:53:21,954 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:53:22,099 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:53:22,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:53:22,240 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:53:22,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:22,240 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:22,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [773042651] [2021-11-23 16:53:22,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [773042651] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:22,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:22,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:53:22,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710391152] [2021-11-23 16:53:22,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:22,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:53:22,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:22,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:53:22,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:53:22,242 INFO L87 Difference]: Start difference. First operand 279 states and 413 transitions. Second operand has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:24,262 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:28,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.91s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:32,695 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:32,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:32,742 INFO L93 Difference]: Finished difference Result 551 states and 822 transitions. [2021-11-23 16:53:32,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:53:32,744 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-23 16:53:32,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:32,746 INFO L225 Difference]: With dead ends: 551 [2021-11-23 16:53:32,746 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 16:53:32,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:53:32,747 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 31 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:32,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 570 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 135 Invalid, 1 Unknown, 39 Unchecked, 10.5s Time] [2021-11-23 16:53:32,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 16:53:32,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 279. [2021-11-23 16:53:32,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4820143884892085) internal successors, (412), 278 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:32,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 412 transitions. [2021-11-23 16:53:32,753 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 412 transitions. Word has length 109 [2021-11-23 16:53:32,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:32,753 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 412 transitions. [2021-11-23 16:53:32,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.75) internal successors, (99), 4 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:32,754 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 412 transitions. [2021-11-23 16:53:32,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 16:53:32,755 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:32,755 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:32,782 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 16:53:32,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:32,963 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:32,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:32,964 INFO L85 PathProgramCache]: Analyzing trace with hash -2140185186, now seen corresponding path program 1 times [2021-11-23 16:53:32,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:32,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [986919231] [2021-11-23 16:53:32,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:32,965 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:32,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:32,966 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:32,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:53:35,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:35,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 846 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:53:35,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:35,284 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:53:35,284 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:53:35,459 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:53:35,459 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:53:35,588 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:53:35,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:53:35,728 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:53:35,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:35,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:35,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [986919231] [2021-11-23 16:53:35,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [986919231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:35,729 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:35,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:53:35,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368775311] [2021-11-23 16:53:35,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:35,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:53:35,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:35,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:53:35,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:53:35,731 INFO L87 Difference]: Start difference. First operand 279 states and 412 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:37,754 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:40,193 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:42,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:44,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:44,495 INFO L93 Difference]: Finished difference Result 549 states and 817 transitions. [2021-11-23 16:53:44,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:53:44,497 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2021-11-23 16:53:44,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:44,499 INFO L225 Difference]: With dead ends: 549 [2021-11-23 16:53:44,499 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 16:53:44,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:53:44,501 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 28 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 577 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:44,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 577 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 128 Invalid, 1 Unknown, 32 Unchecked, 8.7s Time] [2021-11-23 16:53:44,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 16:53:44,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 279. [2021-11-23 16:53:44,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4784172661870503) internal successors, (411), 278 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:44,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 411 transitions. [2021-11-23 16:53:44,535 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 411 transitions. Word has length 110 [2021-11-23 16:53:44,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:44,536 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 411 transitions. [2021-11-23 16:53:44,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:44,536 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 411 transitions. [2021-11-23 16:53:44,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 16:53:44,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:44,538 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:44,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:44,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:44,756 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:44,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:44,757 INFO L85 PathProgramCache]: Analyzing trace with hash -173687, now seen corresponding path program 1 times [2021-11-23 16:53:44,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:44,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [753996516] [2021-11-23 16:53:44,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:44,758 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:44,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:44,759 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:44,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 16:53:46,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:46,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:53:46,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:47,097 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:53:47,098 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:53:47,296 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:53:47,297 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:53:47,451 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:53:47,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:53:47,579 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:53:47,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:53:47,580 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:47,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [753996516] [2021-11-23 16:53:47,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [753996516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:53:47,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:53:47,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:53:47,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151121715] [2021-11-23 16:53:47,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:53:47,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:53:47,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:47,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:53:47,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:53:47,581 INFO L87 Difference]: Start difference. First operand 279 states and 411 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:49,601 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:52,973 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:56,292 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:57,963 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:53:58,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:58,012 INFO L93 Difference]: Finished difference Result 551 states and 818 transitions. [2021-11-23 16:53:58,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:53:58,013 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2021-11-23 16:53:58,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:58,015 INFO L225 Difference]: With dead ends: 551 [2021-11-23 16:53:58,015 INFO L226 Difference]: Without dead ends: 293 [2021-11-23 16:53:58,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:53:58,017 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 30 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:58,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 557 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 136 Invalid, 1 Unknown, 40 Unchecked, 10.4s Time] [2021-11-23 16:53:58,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-23 16:53:58,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 279. [2021-11-23 16:53:58,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.474820143884892) internal successors, (410), 278 states have internal predecessors, (410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:58,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 410 transitions. [2021-11-23 16:53:58,026 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 410 transitions. Word has length 110 [2021-11-23 16:53:58,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:58,027 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 410 transitions. [2021-11-23 16:53:58,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:58,027 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 410 transitions. [2021-11-23 16:53:58,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:53:58,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:58,028 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:58,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:58,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:58,231 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:58,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:58,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1535697468, now seen corresponding path program 1 times [2021-11-23 16:53:58,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:58,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [416072634] [2021-11-23 16:53:58,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:58,232 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:58,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:58,234 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:58,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 16:54:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:00,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:00,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:00,332 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:54:00,333 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:54:00,517 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:54:00,517 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:54:00,645 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:54:00,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:54:00,779 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:00,779 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:00,779 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:00,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [416072634] [2021-11-23 16:54:00,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [416072634] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:00,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:00,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:00,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467648456] [2021-11-23 16:54:00,780 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:00,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:00,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:00,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:00,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:00,781 INFO L87 Difference]: Start difference. First operand 279 states and 410 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:02,800 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:06,475 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.95s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:09,118 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:10,562 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:10,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:10,608 INFO L93 Difference]: Finished difference Result 549 states and 813 transitions. [2021-11-23 16:54:10,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:10,609 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:54:10,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:10,611 INFO L225 Difference]: With dead ends: 549 [2021-11-23 16:54:10,611 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 16:54:10,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:54:10,612 INFO L933 BasicCegarLoop]: 230 mSDtfsCounter, 28 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:10,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 576 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 129 Invalid, 1 Unknown, 33 Unchecked, 9.8s Time] [2021-11-23 16:54:10,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 16:54:10,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 279. [2021-11-23 16:54:10,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4712230215827338) internal successors, (409), 278 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:10,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 409 transitions. [2021-11-23 16:54:10,621 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 409 transitions. Word has length 111 [2021-11-23 16:54:10,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:10,621 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 409 transitions. [2021-11-23 16:54:10,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:10,622 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 409 transitions. [2021-11-23 16:54:10,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:54:10,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:10,623 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:10,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:10,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:10,844 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:10,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:10,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1022235621, now seen corresponding path program 1 times [2021-11-23 16:54:10,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:10,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1974375049] [2021-11-23 16:54:10,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:10,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:10,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:10,847 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:10,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:54:12,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:12,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 815 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:12,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:12,869 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:54:12,869 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:54:13,048 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:54:13,049 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:54:13,196 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:54:13,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:54:13,306 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:13,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:13,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:13,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1974375049] [2021-11-23 16:54:13,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1974375049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:13,307 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:13,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:13,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709980491] [2021-11-23 16:54:13,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:13,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:13,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:13,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:13,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:13,308 INFO L87 Difference]: Start difference. First operand 279 states and 409 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:15,333 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:20,752 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:22,357 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:22,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:22,403 INFO L93 Difference]: Finished difference Result 549 states and 811 transitions. [2021-11-23 16:54:22,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:22,404 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:54:22,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:22,406 INFO L225 Difference]: With dead ends: 549 [2021-11-23 16:54:22,406 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 16:54:22,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:54:22,408 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 28 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:22,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 561 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 1 Unknown, 38 Unchecked, 9.1s Time] [2021-11-23 16:54:22,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 16:54:22,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 279. [2021-11-23 16:54:22,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4676258992805755) internal successors, (408), 278 states have internal predecessors, (408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:22,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 408 transitions. [2021-11-23 16:54:22,417 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 408 transitions. Word has length 111 [2021-11-23 16:54:22,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:22,418 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 408 transitions. [2021-11-23 16:54:22,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:22,418 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 408 transitions. [2021-11-23 16:54:22,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 16:54:22,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:22,420 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:22,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:22,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:22,646 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:22,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:22,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1163311617, now seen corresponding path program 1 times [2021-11-23 16:54:22,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:22,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1223442739] [2021-11-23 16:54:22,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:22,648 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:22,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:22,649 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:22,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 16:54:24,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:24,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:24,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:24,768 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:54:24,768 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:54:24,934 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:54:24,934 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:54:25,096 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:54:25,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:54:25,209 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:25,209 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:25,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:25,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1223442739] [2021-11-23 16:54:25,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1223442739] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:25,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:25,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:25,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275559732] [2021-11-23 16:54:25,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:25,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:25,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:25,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:25,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:25,211 INFO L87 Difference]: Start difference. First operand 279 states and 408 transitions. Second operand has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,230 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:30,111 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:33,300 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:34,931 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:34,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:34,977 INFO L93 Difference]: Finished difference Result 549 states and 809 transitions. [2021-11-23 16:54:34,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:34,979 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 16:54:34,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:34,981 INFO L225 Difference]: With dead ends: 549 [2021-11-23 16:54:34,981 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 16:54:34,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:54:34,982 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 28 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 9.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:34,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 570 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 135 Invalid, 1 Unknown, 39 Unchecked, 9.7s Time] [2021-11-23 16:54:34,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 16:54:34,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 279. [2021-11-23 16:54:34,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.4640287769784173) internal successors, (407), 278 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:34,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 407 transitions. [2021-11-23 16:54:34,992 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 407 transitions. Word has length 114 [2021-11-23 16:54:34,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:34,992 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 407 transitions. [2021-11-23 16:54:34,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:34,992 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 407 transitions. [2021-11-23 16:54:34,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:54:34,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:34,994 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:35,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:35,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:35,194 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:35,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:35,195 INFO L85 PathProgramCache]: Analyzing trace with hash -1217299686, now seen corresponding path program 1 times [2021-11-23 16:54:35,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:35,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1363479220] [2021-11-23 16:54:35,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:35,196 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:35,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:35,197 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:35,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 16:54:37,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:37,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 822 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:37,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:37,341 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:54:37,342 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:54:37,531 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:54:37,531 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:54:37,690 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:54:37,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:54:37,805 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 85 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:37,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:37,806 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:37,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1363479220] [2021-11-23 16:54:37,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1363479220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:37,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:37,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:37,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269288481] [2021-11-23 16:54:37,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:37,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:37,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:37,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:37,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:37,808 INFO L87 Difference]: Start difference. First operand 279 states and 407 transitions. Second operand has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:39,827 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:45,093 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:46,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:46,509 INFO L93 Difference]: Finished difference Result 549 states and 807 transitions. [2021-11-23 16:54:46,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:54:46,511 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:54:46,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:46,512 INFO L225 Difference]: With dead ends: 549 [2021-11-23 16:54:46,513 INFO L226 Difference]: Without dead ends: 291 [2021-11-23 16:54:46,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:54:46,514 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 28 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:46,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 557 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 136 Invalid, 1 Unknown, 40 Unchecked, 8.7s Time] [2021-11-23 16:54:46,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-23 16:54:46,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 279. [2021-11-23 16:54:46,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.460431654676259) internal successors, (406), 278 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:46,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 406 transitions. [2021-11-23 16:54:46,551 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 406 transitions. Word has length 115 [2021-11-23 16:54:46,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:46,566 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 406 transitions. [2021-11-23 16:54:46,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:46,567 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 406 transitions. [2021-11-23 16:54:46,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:54:46,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:46,568 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:46,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:46,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:46,769 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:46,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:46,770 INFO L85 PathProgramCache]: Analyzing trace with hash 1799561814, now seen corresponding path program 1 times [2021-11-23 16:54:46,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:46,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1709729802] [2021-11-23 16:54:46,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:46,771 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:46,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:46,772 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:46,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:54:48,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:48,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:54:48,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:48,524 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:48,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:48,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:48,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1709729802] [2021-11-23 16:54:48,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1709729802] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:48,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:48,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:54:48,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423969836] [2021-11-23 16:54:48,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:48,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:54:48,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:48,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:54:48,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:48,526 INFO L87 Difference]: Start difference. First operand 279 states and 406 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:49,337 INFO L93 Difference]: Finished difference Result 790 states and 1164 transitions. [2021-11-23 16:54:49,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:54:49,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:54:49,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:49,340 INFO L225 Difference]: With dead ends: 790 [2021-11-23 16:54:49,341 INFO L226 Difference]: Without dead ends: 532 [2021-11-23 16:54:49,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:54:49,342 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 148 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:49,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 424 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 16:54:49,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-11-23 16:54:49,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 530. [2021-11-23 16:54:49,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.4536862003780717) internal successors, (769), 529 states have internal predecessors, (769), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 769 transitions. [2021-11-23 16:54:49,357 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 769 transitions. Word has length 115 [2021-11-23 16:54:49,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:49,357 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 769 transitions. [2021-11-23 16:54:49,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:49,358 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 769 transitions. [2021-11-23 16:54:49,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 16:54:49,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:49,360 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:49,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:49,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:49,587 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:49,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:49,588 INFO L85 PathProgramCache]: Analyzing trace with hash -45805352, now seen corresponding path program 1 times [2021-11-23 16:54:49,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:49,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [93629863] [2021-11-23 16:54:49,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:49,589 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:49,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:49,591 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:49,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 16:54:51,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:51,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:54:51,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:51,830 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:54:51,831 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:54:52,031 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:54:52,031 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:54:52,212 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:54:52,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:54:52,345 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:54:52,345 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:54:52,345 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:52,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [93629863] [2021-11-23 16:54:52,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [93629863] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:54:52,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:54:52,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:54:52,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555609540] [2021-11-23 16:54:52,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:54:52,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:54:52,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:52,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:54:52,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:54:52,347 INFO L87 Difference]: Start difference. First operand 530 states and 769 transitions. Second operand has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:54,368 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:54:59,185 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:01,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:01,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:01,209 INFO L93 Difference]: Finished difference Result 1062 states and 1544 transitions. [2021-11-23 16:55:01,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:01,210 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 16:55:01,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:01,213 INFO L225 Difference]: With dead ends: 1062 [2021-11-23 16:55:01,213 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 16:55:01,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:55:01,214 INFO L933 BasicCegarLoop]: 222 mSDtfsCounter, 28 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:01,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 555 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 137 Invalid, 1 Unknown, 41 Unchecked, 8.8s Time] [2021-11-23 16:55:01,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 16:55:01,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 530. [2021-11-23 16:55:01,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.449905482041588) internal successors, (767), 529 states have internal predecessors, (767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:01,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 767 transitions. [2021-11-23 16:55:01,231 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 767 transitions. Word has length 115 [2021-11-23 16:55:01,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:01,231 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 767 transitions. [2021-11-23 16:55:01,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:01,232 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 767 transitions. [2021-11-23 16:55:01,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 16:55:01,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:01,234 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:01,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:01,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:01,451 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:01,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:01,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1298312321, now seen corresponding path program 1 times [2021-11-23 16:55:01,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:01,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1724337905] [2021-11-23 16:55:01,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:01,453 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:01,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:01,453 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 16:55:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:03,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:55:03,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:03,600 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:55:03,600 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:55:03,780 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:55:03,780 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:55:03,994 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:55:03,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:55:04,109 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:55:04,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:04,110 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:04,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1724337905] [2021-11-23 16:55:04,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1724337905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:04,110 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:04,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:55:04,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515783042] [2021-11-23 16:55:04,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:04,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:04,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:04,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:04,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:04,112 INFO L87 Difference]: Start difference. First operand 530 states and 767 transitions. Second operand has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:06,133 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:09,241 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:12,014 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:14,151 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:14,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:14,524 INFO L93 Difference]: Finished difference Result 1062 states and 1540 transitions. [2021-11-23 16:55:14,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:14,525 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-23 16:55:14,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:14,528 INFO L225 Difference]: With dead ends: 1062 [2021-11-23 16:55:14,528 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 16:55:14,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:55:14,529 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 28 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:14,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 567 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 138 Invalid, 1 Unknown, 42 Unchecked, 10.4s Time] [2021-11-23 16:55:14,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 16:55:14,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 530. [2021-11-23 16:55:14,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.446124763705104) internal successors, (765), 529 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:14,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 765 transitions. [2021-11-23 16:55:14,549 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 765 transitions. Word has length 116 [2021-11-23 16:55:14,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:14,550 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 765 transitions. [2021-11-23 16:55:14,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:14,550 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 765 transitions. [2021-11-23 16:55:14,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:55:14,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:14,552 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:14,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:14,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:14,766 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:14,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:14,767 INFO L85 PathProgramCache]: Analyzing trace with hash -97387920, now seen corresponding path program 1 times [2021-11-23 16:55:14,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:14,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [77947033] [2021-11-23 16:55:14,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:14,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:14,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:14,771 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:14,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 16:55:16,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:16,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:55:16,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:17,059 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:55:17,059 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:55:17,229 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:55:17,230 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:55:17,404 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:55:17,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:55:17,517 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:55:17,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:17,517 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:17,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [77947033] [2021-11-23 16:55:17,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [77947033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:17,518 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:17,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:55:17,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670212671] [2021-11-23 16:55:17,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:17,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:17,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:17,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:17,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:17,520 INFO L87 Difference]: Start difference. First operand 530 states and 765 transitions. Second operand has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:19,539 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:22,058 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:26,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:26,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:26,287 INFO L93 Difference]: Finished difference Result 1062 states and 1536 transitions. [2021-11-23 16:55:26,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:26,289 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:55:26,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:26,292 INFO L225 Difference]: With dead ends: 1062 [2021-11-23 16:55:26,292 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 16:55:26,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:55:26,293 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 28 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:26,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 551 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 139 Invalid, 1 Unknown, 43 Unchecked, 8.7s Time] [2021-11-23 16:55:26,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 16:55:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 530. [2021-11-23 16:55:26,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.44234404536862) internal successors, (763), 529 states have internal predecessors, (763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:26,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 763 transitions. [2021-11-23 16:55:26,308 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 763 transitions. Word has length 117 [2021-11-23 16:55:26,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:26,308 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 763 transitions. [2021-11-23 16:55:26,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.75) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:26,309 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 763 transitions. [2021-11-23 16:55:26,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 16:55:26,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:26,311 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:26,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:26,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:26,534 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:26,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:26,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1560907797, now seen corresponding path program 1 times [2021-11-23 16:55:26,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:26,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [484081192] [2021-11-23 16:55:26,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:26,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:26,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:26,537 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:26,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 16:55:28,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:28,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 916 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:55:28,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:29,475 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:55:29,476 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:55:29,561 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:55:29,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:55:29,688 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:55:29,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:29,688 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:29,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [484081192] [2021-11-23 16:55:29,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [484081192] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:29,689 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:29,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:55:29,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412029853] [2021-11-23 16:55:29,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:29,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:29,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:29,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:29,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:29,691 INFO L87 Difference]: Start difference. First operand 530 states and 763 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:31,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:37,664 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:37,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:37,875 INFO L93 Difference]: Finished difference Result 1039 states and 1502 transitions. [2021-11-23 16:55:37,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:37,877 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-23 16:55:37,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:37,880 INFO L225 Difference]: With dead ends: 1039 [2021-11-23 16:55:37,880 INFO L226 Difference]: Without dead ends: 530 [2021-11-23 16:55:37,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:55:37,881 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:37,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 1 Unknown, 15 Unchecked, 8.1s Time] [2021-11-23 16:55:37,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2021-11-23 16:55:37,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 530. [2021-11-23 16:55:37,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.438563327032136) internal successors, (761), 529 states have internal predecessors, (761), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:37,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 761 transitions. [2021-11-23 16:55:37,898 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 761 transitions. Word has length 117 [2021-11-23 16:55:37,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:37,898 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 761 transitions. [2021-11-23 16:55:37,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:37,898 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 761 transitions. [2021-11-23 16:55:37,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 16:55:37,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:37,919 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:37,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:38,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:38,143 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:38,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:38,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1633742857, now seen corresponding path program 1 times [2021-11-23 16:55:38,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:38,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1082745865] [2021-11-23 16:55:38,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:38,145 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:38,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:38,147 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:38,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 16:55:40,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:40,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 845 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:55:40,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:40,340 INFO L354 Elim1Store]: treesize reduction 180, result has 14.3 percent of original size [2021-11-23 16:55:40,341 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 3 case distinctions, treesize of input 29 treesize of output 39 [2021-11-23 16:55:40,514 INFO L354 Elim1Store]: treesize reduction 324, result has 10.2 percent of original size [2021-11-23 16:55:40,515 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 4 case distinctions, treesize of input 40 treesize of output 51 [2021-11-23 16:55:40,692 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:55:40,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:55:40,816 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:55:40,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:40,817 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:40,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1082745865] [2021-11-23 16:55:40,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1082745865] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:40,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:40,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:55:40,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422918557] [2021-11-23 16:55:40,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:40,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:40,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:40,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:40,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:40,819 INFO L87 Difference]: Start difference. First operand 530 states and 761 transitions. Second operand has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:42,838 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:45,560 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:49,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:55:49,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:49,578 INFO L93 Difference]: Finished difference Result 1062 states and 1528 transitions. [2021-11-23 16:55:49,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:55:49,579 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-23 16:55:49,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:49,582 INFO L225 Difference]: With dead ends: 1062 [2021-11-23 16:55:49,582 INFO L226 Difference]: Without dead ends: 553 [2021-11-23 16:55:49,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:55:49,584 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 28 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:49,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 549 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 140 Invalid, 1 Unknown, 44 Unchecked, 8.7s Time] [2021-11-23 16:55:49,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-11-23 16:55:49,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 530. [2021-11-23 16:55:49,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.434782608695652) internal successors, (759), 529 states have internal predecessors, (759), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:49,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 759 transitions. [2021-11-23 16:55:49,618 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 759 transitions. Word has length 118 [2021-11-23 16:55:49,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:49,619 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 759 transitions. [2021-11-23 16:55:49,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:49,619 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 759 transitions. [2021-11-23 16:55:49,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 16:55:49,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:49,632 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:49,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2021-11-23 16:55:49,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:49,854 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:49,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:49,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1849173279, now seen corresponding path program 1 times [2021-11-23 16:55:49,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:49,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [127346764] [2021-11-23 16:55:49,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:49,857 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:49,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:49,858 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:49,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 16:55:52,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:52,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:55:52,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:52,895 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:55:52,896 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:55:52,974 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:55:52,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:55:53,081 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:55:53,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:53,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:53,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [127346764] [2021-11-23 16:55:53,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [127346764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:53,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:55:53,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:55:53,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505745175] [2021-11-23 16:55:53,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:53,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:55:53,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:53,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:55:53,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:55:53,084 INFO L87 Difference]: Start difference. First operand 530 states and 759 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:55,106 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:01,124 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:03,033 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:03,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:03,283 INFO L93 Difference]: Finished difference Result 1043 states and 1498 transitions. [2021-11-23 16:56:03,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:56:03,285 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-23 16:56:03,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:03,288 INFO L225 Difference]: With dead ends: 1043 [2021-11-23 16:56:03,289 INFO L226 Difference]: Without dead ends: 534 [2021-11-23 16:56:03,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:56:03,290 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 11 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:03,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 553 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 111 Invalid, 2 Unknown, 19 Unchecked, 10.2s Time] [2021-11-23 16:56:03,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-11-23 16:56:03,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 530. [2021-11-23 16:56:03,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.4310018903591681) internal successors, (757), 529 states have internal predecessors, (757), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:03,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 757 transitions. [2021-11-23 16:56:03,305 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 757 transitions. Word has length 118 [2021-11-23 16:56:03,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:03,306 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 757 transitions. [2021-11-23 16:56:03,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:03,306 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 757 transitions. [2021-11-23 16:56:03,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 16:56:03,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:03,307 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:03,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:03,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:03,508 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:03,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:03,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1113828447, now seen corresponding path program 1 times [2021-11-23 16:56:03,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:03,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1294186058] [2021-11-23 16:56:03,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:03,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:03,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:03,511 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:03,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 16:56:05,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:05,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 918 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:56:05,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:06,343 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:56:06,343 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:56:06,417 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:56:06,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:56:06,524 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:56:06,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:06,525 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:06,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1294186058] [2021-11-23 16:56:06,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1294186058] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:06,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:06,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:56:06,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472582137] [2021-11-23 16:56:06,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:06,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:56:06,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:06,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:56:06,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:56:06,527 INFO L87 Difference]: Start difference. First operand 530 states and 757 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:08,566 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:11,346 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:13,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:15,935 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:16,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:16,128 INFO L93 Difference]: Finished difference Result 1039 states and 1490 transitions. [2021-11-23 16:56:16,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:56:16,130 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-23 16:56:16,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:16,133 INFO L225 Difference]: With dead ends: 1039 [2021-11-23 16:56:16,133 INFO L226 Difference]: Without dead ends: 530 [2021-11-23 16:56:16,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:56:16,134 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:16,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 109 Invalid, 1 Unknown, 15 Unchecked, 9.6s Time] [2021-11-23 16:56:16,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2021-11-23 16:56:16,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 530. [2021-11-23 16:56:16,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.4272211720226844) internal successors, (755), 529 states have internal predecessors, (755), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:16,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 755 transitions. [2021-11-23 16:56:16,144 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 755 transitions. Word has length 118 [2021-11-23 16:56:16,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:16,144 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 755 transitions. [2021-11-23 16:56:16,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:16,145 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 755 transitions. [2021-11-23 16:56:16,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 16:56:16,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:16,146 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:16,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 16:56:16,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:16,347 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:16,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:16,347 INFO L85 PathProgramCache]: Analyzing trace with hash 2050141013, now seen corresponding path program 1 times [2021-11-23 16:56:16,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:16,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [614185303] [2021-11-23 16:56:16,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:16,349 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:16,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:16,349 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:16,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 16:56:18,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:18,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:56:18,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:19,167 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:56:19,168 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:56:19,363 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:56:19,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:56:19,403 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:56:19,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:19,404 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:19,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [614185303] [2021-11-23 16:56:19,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [614185303] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:19,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:19,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:56:19,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306749255] [2021-11-23 16:56:19,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:19,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:56:19,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:19,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:56:19,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:56:19,407 INFO L87 Difference]: Start difference. First operand 530 states and 755 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:21,435 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:24,296 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:28,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:31,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:31,440 INFO L93 Difference]: Finished difference Result 1200 states and 1732 transitions. [2021-11-23 16:56:31,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:56:31,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-23 16:56:31,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:31,446 INFO L225 Difference]: With dead ends: 1200 [2021-11-23 16:56:31,446 INFO L226 Difference]: Without dead ends: 691 [2021-11-23 16:56:31,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:56:31,447 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 70 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 12.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:31,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 550 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 167 Invalid, 1 Unknown, 67 Unchecked, 12.0s Time] [2021-11-23 16:56:31,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-11-23 16:56:31,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 608. [2021-11-23 16:56:31,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 608 states, 607 states have (on average 1.4645799011532126) internal successors, (889), 607 states have internal predecessors, (889), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:31,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 608 states to 608 states and 889 transitions. [2021-11-23 16:56:31,467 INFO L78 Accepts]: Start accepts. Automaton has 608 states and 889 transitions. Word has length 123 [2021-11-23 16:56:31,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:31,467 INFO L470 AbstractCegarLoop]: Abstraction has 608 states and 889 transitions. [2021-11-23 16:56:31,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:31,468 INFO L276 IsEmpty]: Start isEmpty. Operand 608 states and 889 transitions. [2021-11-23 16:56:31,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 16:56:31,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:31,470 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:31,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:31,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:31,687 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:31,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:31,687 INFO L85 PathProgramCache]: Analyzing trace with hash -877921552, now seen corresponding path program 1 times [2021-11-23 16:56:31,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:31,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1840013633] [2021-11-23 16:56:31,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:31,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:31,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:31,689 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:31,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 16:56:34,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:34,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 864 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:56:34,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:34,629 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:56:34,630 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:56:34,847 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:56:34,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:56:34,874 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:56:34,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:34,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:34,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1840013633] [2021-11-23 16:56:34,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1840013633] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:34,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:34,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:56:34,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038363801] [2021-11-23 16:56:34,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:34,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:56:34,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:34,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:56:34,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:56:34,877 INFO L87 Difference]: Start difference. First operand 608 states and 889 transitions. Second operand has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:36,896 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:39,077 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:43,390 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:46,721 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:47,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:47,340 INFO L93 Difference]: Finished difference Result 1280 states and 1868 transitions. [2021-11-23 16:56:47,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:56:47,342 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2021-11-23 16:56:47,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:47,346 INFO L225 Difference]: With dead ends: 1280 [2021-11-23 16:56:47,346 INFO L226 Difference]: Without dead ends: 693 [2021-11-23 16:56:47,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:56:47,347 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 70 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 12.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:47,347 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 550 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 168 Invalid, 1 Unknown, 68 Unchecked, 12.4s Time] [2021-11-23 16:56:47,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-11-23 16:56:47,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 606. [2021-11-23 16:56:47,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 606 states, 605 states have (on average 1.4661157024793388) internal successors, (887), 605 states have internal predecessors, (887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:47,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 606 states to 606 states and 887 transitions. [2021-11-23 16:56:47,362 INFO L78 Accepts]: Start accepts. Automaton has 606 states and 887 transitions. Word has length 124 [2021-11-23 16:56:47,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:47,363 INFO L470 AbstractCegarLoop]: Abstraction has 606 states and 887 transitions. [2021-11-23 16:56:47,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.5) internal successors, (98), 4 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:47,363 INFO L276 IsEmpty]: Start isEmpty. Operand 606 states and 887 transitions. [2021-11-23 16:56:47,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 16:56:47,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:47,364 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:47,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:47,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:47,565 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:47,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:47,565 INFO L85 PathProgramCache]: Analyzing trace with hash 225985155, now seen corresponding path program 1 times [2021-11-23 16:56:47,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:47,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [929440902] [2021-11-23 16:56:47,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:47,566 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:47,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:47,569 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:47,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 16:56:49,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:50,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 877 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:56:50,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:50,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:56:50,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:56:50,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:56:50,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:56:50,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:56:50,100 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:56:50,182 INFO L354 Elim1Store]: treesize reduction 188, result has 13.8 percent of original size [2021-11-23 16:56:50,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 40 [2021-11-23 16:56:50,541 INFO L354 Elim1Store]: treesize reduction 825, result has 7.2 percent of original size [2021-11-23 16:56:50,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 13 case distinctions, treesize of input 68 treesize of output 88 [2021-11-23 16:56:51,405 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:56:51,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-11-23 16:56:51,523 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:56:51,523 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:51,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:51,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [929440902] [2021-11-23 16:56:51,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [929440902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:51,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:51,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:56:51,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885497591] [2021-11-23 16:56:51,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:51,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:56:51,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:51,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:56:51,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:56:51,540 INFO L87 Difference]: Start difference. First operand 606 states and 887 transitions. Second operand has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:53,560 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:56:59,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:01,994 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:02,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:02,721 INFO L93 Difference]: Finished difference Result 1222 states and 1790 transitions. [2021-11-23 16:57:02,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:02,723 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2021-11-23 16:57:02,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:02,726 INFO L225 Difference]: With dead ends: 1222 [2021-11-23 16:57:02,726 INFO L226 Difference]: Without dead ends: 637 [2021-11-23 16:57:02,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:02,728 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 28 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:02,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 541 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 194 Invalid, 1 Unknown, 0 Unchecked, 11.1s Time] [2021-11-23 16:57:02,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-11-23 16:57:02,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 612. [2021-11-23 16:57:02,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 611 states have (on average 1.4615384615384615) internal successors, (893), 611 states have internal predecessors, (893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:02,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 893 transitions. [2021-11-23 16:57:02,759 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 893 transitions. Word has length 125 [2021-11-23 16:57:02,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:02,759 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 893 transitions. [2021-11-23 16:57:02,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:02,760 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 893 transitions. [2021-11-23 16:57:02,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:57:02,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:02,762 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:02,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:02,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:02,987 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:02,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:02,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1276547533, now seen corresponding path program 1 times [2021-11-23 16:57:02,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:02,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [100057405] [2021-11-23 16:57:02,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:02,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:02,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:02,989 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:02,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 16:57:05,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:05,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:57:05,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:05,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:57:05,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:57:05,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:57:05,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:57:05,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 16:57:05,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 16:57:06,168 INFO L354 Elim1Store]: treesize reduction 1109, result has 5.5 percent of original size [2021-11-23 16:57:06,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 7 case distinctions, treesize of input 52 treesize of output 73 [2021-11-23 16:57:06,904 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:57:06,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 70 treesize of output 22 [2021-11-23 16:57:06,954 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 16:57:06,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:06,954 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:06,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [100057405] [2021-11-23 16:57:06,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [100057405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:06,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:06,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:57:06,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218590007] [2021-11-23 16:57:06,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:06,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:57:06,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:06,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:57:06,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:06,956 INFO L87 Difference]: Start difference. First operand 612 states and 893 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:08,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:13,003 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:15,140 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:18,066 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:20,240 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:24,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:24,278 INFO L93 Difference]: Finished difference Result 1308 states and 1922 transitions. [2021-11-23 16:57:24,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:24,281 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2021-11-23 16:57:24,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:24,285 INFO L225 Difference]: With dead ends: 1308 [2021-11-23 16:57:24,285 INFO L226 Difference]: Without dead ends: 717 [2021-11-23 16:57:24,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:24,286 INFO L933 BasicCegarLoop]: 249 mSDtfsCounter, 44 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:24,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 607 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 203 Invalid, 1 Unknown, 0 Unchecked, 17.2s Time] [2021-11-23 16:57:24,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2021-11-23 16:57:24,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 668. [2021-11-23 16:57:24,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4737631184407796) internal successors, (983), 667 states have internal predecessors, (983), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:24,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 983 transitions. [2021-11-23 16:57:24,306 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 983 transitions. Word has length 132 [2021-11-23 16:57:24,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:24,307 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 983 transitions. [2021-11-23 16:57:24,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:24,307 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 983 transitions. [2021-11-23 16:57:24,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 16:57:24,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:24,310 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:24,346 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-23 16:57:24,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:24,524 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:24,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:24,525 INFO L85 PathProgramCache]: Analyzing trace with hash 94210731, now seen corresponding path program 1 times [2021-11-23 16:57:24,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:24,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [517477538] [2021-11-23 16:57:24,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:24,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:24,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:24,527 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:24,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:57:26,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:27,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:57:27,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:27,535 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:57:27,535 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:57:27,609 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:57:27,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:57:27,732 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:57:27,732 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:27,732 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:27,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [517477538] [2021-11-23 16:57:27,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [517477538] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:27,733 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:27,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:57:27,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341119387] [2021-11-23 16:57:27,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:27,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:57:27,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:27,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:57:27,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:27,734 INFO L87 Difference]: Start difference. First operand 668 states and 983 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:29,753 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:32,381 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:35,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:35,653 INFO L93 Difference]: Finished difference Result 1315 states and 1942 transitions. [2021-11-23 16:57:35,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:35,655 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-23 16:57:35,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:35,658 INFO L225 Difference]: With dead ends: 1315 [2021-11-23 16:57:35,658 INFO L226 Difference]: Without dead ends: 668 [2021-11-23 16:57:35,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:35,660 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:35,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 554 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 1 Unknown, 14 Unchecked, 7.9s Time] [2021-11-23 16:57:35,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-11-23 16:57:35,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 668. [2021-11-23 16:57:35,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4707646176911544) internal successors, (981), 667 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:35,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 981 transitions. [2021-11-23 16:57:35,686 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 981 transitions. Word has length 136 [2021-11-23 16:57:35,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:35,686 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 981 transitions. [2021-11-23 16:57:35,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:35,687 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 981 transitions. [2021-11-23 16:57:35,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 16:57:35,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:35,689 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:35,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:35,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:35,911 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:35,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:35,911 INFO L85 PathProgramCache]: Analyzing trace with hash -72142069, now seen corresponding path program 1 times [2021-11-23 16:57:35,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:35,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [598965365] [2021-11-23 16:57:35,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:35,913 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:35,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:35,914 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:35,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 16:57:38,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:38,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 903 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:57:38,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:38,868 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:57:38,868 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:57:38,966 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:57:38,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:57:39,104 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:57:39,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:39,105 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:39,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [598965365] [2021-11-23 16:57:39,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [598965365] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:39,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:39,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:57:39,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231952470] [2021-11-23 16:57:39,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:39,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:57:39,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:39,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:57:39,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:39,107 INFO L87 Difference]: Start difference. First operand 668 states and 981 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:41,136 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:43,618 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:45,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:46,724 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:48,818 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:49,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:49,729 INFO L93 Difference]: Finished difference Result 1319 states and 1942 transitions. [2021-11-23 16:57:49,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:49,732 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 16:57:49,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:49,735 INFO L225 Difference]: With dead ends: 1319 [2021-11-23 16:57:49,735 INFO L226 Difference]: Without dead ends: 672 [2021-11-23 16:57:49,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:57:49,737 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 11 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:49,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 550 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 1 Unknown, 19 Unchecked, 10.6s Time] [2021-11-23 16:57:49,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-11-23 16:57:49,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 668. [2021-11-23 16:57:49,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4677661169415293) internal successors, (979), 667 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:49,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 979 transitions. [2021-11-23 16:57:49,767 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 979 transitions. Word has length 137 [2021-11-23 16:57:49,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:49,767 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 979 transitions. [2021-11-23 16:57:49,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:49,767 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 979 transitions. [2021-11-23 16:57:49,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-23 16:57:49,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:49,769 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:49,801 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Ended with exit code 0 [2021-11-23 16:57:49,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:49,970 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:49,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:49,970 INFO L85 PathProgramCache]: Analyzing trace with hash 663202763, now seen corresponding path program 1 times [2021-11-23 16:57:49,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:49,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [544500849] [2021-11-23 16:57:49,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:49,986 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:49,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:49,987 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:50,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 16:57:52,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:52,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:57:52,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:53,140 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:57:53,141 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:57:53,221 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:57:53,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:57:53,332 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:57:53,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:57:53,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:53,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [544500849] [2021-11-23 16:57:53,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [544500849] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:57:53,333 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:57:53,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:57:53,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586980678] [2021-11-23 16:57:53,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:57:53,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:57:53,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:53,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:57:53,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:53,334 INFO L87 Difference]: Start difference. First operand 668 states and 979 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:55,353 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:57:57,702 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:00,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:02,078 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:02,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:02,974 INFO L93 Difference]: Finished difference Result 1315 states and 1934 transitions. [2021-11-23 16:58:02,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:58:02,977 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-23 16:58:02,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:02,980 INFO L225 Difference]: With dead ends: 1315 [2021-11-23 16:58:02,981 INFO L226 Difference]: Without dead ends: 668 [2021-11-23 16:58:02,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:58:02,982 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:02,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 554 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 109 Invalid, 1 Unknown, 16 Unchecked, 9.6s Time] [2021-11-23 16:58:02,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-11-23 16:58:02,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 668. [2021-11-23 16:58:02,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.464767616191904) internal successors, (977), 667 states have internal predecessors, (977), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:02,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 977 transitions. [2021-11-23 16:58:02,994 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 977 transitions. Word has length 137 [2021-11-23 16:58:02,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:02,994 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 977 transitions. [2021-11-23 16:58:02,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:02,994 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 977 transitions. [2021-11-23 16:58:02,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 16:58:02,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:02,996 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:03,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:03,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:03,203 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:03,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:03,203 INFO L85 PathProgramCache]: Analyzing trace with hash -1262034803, now seen corresponding path program 1 times [2021-11-23 16:58:03,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:03,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [527060060] [2021-11-23 16:58:03,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:03,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:03,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:03,206 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:03,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 16:58:05,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:05,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 1017 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:05,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:06,737 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:58:06,737 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:58:06,848 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:58:06,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:58:06,992 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 16:58:06,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:06,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:06,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [527060060] [2021-11-23 16:58:06,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [527060060] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:06,993 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:06,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:58:06,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108821825] [2021-11-23 16:58:06,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:06,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:58:06,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:06,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:58:06,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:58:06,995 INFO L87 Difference]: Start difference. First operand 668 states and 977 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:09,013 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:12,362 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:15,776 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:16,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:16,493 INFO L93 Difference]: Finished difference Result 1315 states and 1930 transitions. [2021-11-23 16:58:16,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:58:16,495 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-23 16:58:16,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:16,498 INFO L225 Difference]: With dead ends: 1315 [2021-11-23 16:58:16,498 INFO L226 Difference]: Without dead ends: 668 [2021-11-23 16:58:16,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:58:16,500 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 9.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:16,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 107 Invalid, 2 Unknown, 16 Unchecked, 9.5s Time] [2021-11-23 16:58:16,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-11-23 16:58:16,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 668. [2021-11-23 16:58:16,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.461769115442279) internal successors, (975), 667 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:16,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 975 transitions. [2021-11-23 16:58:16,514 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 975 transitions. Word has length 145 [2021-11-23 16:58:16,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:16,515 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 975 transitions. [2021-11-23 16:58:16,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:16,515 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 975 transitions. [2021-11-23 16:58:16,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 16:58:16,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:16,517 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:16,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:16,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:16,723 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:16,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:16,723 INFO L85 PathProgramCache]: Analyzing trace with hash 833919337, now seen corresponding path program 1 times [2021-11-23 16:58:16,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:16,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [600984286] [2021-11-23 16:58:16,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:16,724 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:16,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:16,725 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:16,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 16:58:19,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:19,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:19,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:19,710 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:58:19,710 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:58:19,792 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:58:19,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:58:19,889 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 16:58:19,889 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:19,890 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:19,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [600984286] [2021-11-23 16:58:19,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [600984286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:19,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:19,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:58:19,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264721688] [2021-11-23 16:58:19,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:19,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:58:19,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:19,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:58:19,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:58:19,891 INFO L87 Difference]: Start difference. First operand 668 states and 975 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:21,907 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:24,507 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:26,879 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:28,304 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:29,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:29,107 INFO L93 Difference]: Finished difference Result 1319 states and 1930 transitions. [2021-11-23 16:58:29,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:58:29,110 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2021-11-23 16:58:29,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:29,113 INFO L225 Difference]: With dead ends: 1319 [2021-11-23 16:58:29,113 INFO L226 Difference]: Without dead ends: 672 [2021-11-23 16:58:29,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:58:29,114 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 11 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:29,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 551 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 1 Unknown, 18 Unchecked, 9.2s Time] [2021-11-23 16:58:29,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-11-23 16:58:29,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 668. [2021-11-23 16:58:29,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4587706146926536) internal successors, (973), 667 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:29,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 973 transitions. [2021-11-23 16:58:29,125 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 973 transitions. Word has length 146 [2021-11-23 16:58:29,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:29,126 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 973 transitions. [2021-11-23 16:58:29,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:29,126 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 973 transitions. [2021-11-23 16:58:29,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 16:58:29,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:29,127 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:29,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:29,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:29,331 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:29,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:29,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1569264169, now seen corresponding path program 1 times [2021-11-23 16:58:29,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:29,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1568047454] [2021-11-23 16:58:29,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:29,334 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:29,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:29,335 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:29,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 16:58:31,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:31,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 1019 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:31,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:32,343 INFO L354 Elim1Store]: treesize reduction 1100, result has 5.5 percent of original size [2021-11-23 16:58:32,343 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 7 case distinctions, treesize of input 49 treesize of output 73 [2021-11-23 16:58:32,435 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:58:32,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 13 [2021-11-23 16:58:32,555 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 125 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 16:58:32,555 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:32,555 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:32,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1568047454] [2021-11-23 16:58:32,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1568047454] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:32,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:32,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:58:32,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607574986] [2021-11-23 16:58:32,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:32,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:58:32,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:32,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:58:32,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:58:32,557 INFO L87 Difference]: Start difference. First operand 668 states and 973 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:34,585 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:37,106 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:38,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:40,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:40,250 INFO L93 Difference]: Finished difference Result 1315 states and 1922 transitions. [2021-11-23 16:58:40,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:58:40,251 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2021-11-23 16:58:40,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:40,254 INFO L225 Difference]: With dead ends: 1315 [2021-11-23 16:58:40,254 INFO L226 Difference]: Without dead ends: 668 [2021-11-23 16:58:40,255 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:58:40,256 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 10 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:40,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 555 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 109 Invalid, 1 Unknown, 17 Unchecked, 7.7s Time] [2021-11-23 16:58:40,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-11-23 16:58:40,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 668. [2021-11-23 16:58:40,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4557721139430284) internal successors, (971), 667 states have internal predecessors, (971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:40,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 971 transitions. [2021-11-23 16:58:40,271 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 971 transitions. Word has length 146 [2021-11-23 16:58:40,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:40,272 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 971 transitions. [2021-11-23 16:58:40,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:40,272 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 971 transitions. [2021-11-23 16:58:40,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 16:58:40,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:40,274 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:40,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:40,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:40,499 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:40,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:40,499 INFO L85 PathProgramCache]: Analyzing trace with hash -801688504, now seen corresponding path program 1 times [2021-11-23 16:58:40,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:40,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [568236327] [2021-11-23 16:58:40,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:40,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:40,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:40,501 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:40,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 16:58:42,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:43,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 948 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:43,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:43,576 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:58:43,576 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:58:43,718 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:58:43,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:58:43,821 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 136 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:58:43,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:43,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:43,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [568236327] [2021-11-23 16:58:43,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [568236327] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:43,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:43,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:58:43,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3807103] [2021-11-23 16:58:43,822 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:43,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:58:43,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:43,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:58:43,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:58:43,823 INFO L87 Difference]: Start difference. First operand 668 states and 971 transitions. Second operand has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:45,843 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:48,781 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:50,718 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:58:52,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:52,440 INFO L93 Difference]: Finished difference Result 1342 states and 1954 transitions. [2021-11-23 16:58:52,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:58:52,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2021-11-23 16:58:52,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:52,445 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:58:52,445 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:58:52,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:58:52,446 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:52,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 136 Invalid, 1 Unknown, 36 Unchecked, 8.6s Time] [2021-11-23 16:58:52,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:58:52,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:58:52,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4527736131934033) internal successors, (969), 667 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:52,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 969 transitions. [2021-11-23 16:58:52,463 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 969 transitions. Word has length 148 [2021-11-23 16:58:52,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:52,464 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 969 transitions. [2021-11-23 16:58:52,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:52,464 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 969 transitions. [2021-11-23 16:58:52,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 16:58:52,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:52,466 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:52,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:52,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:58:52,682 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:52,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:52,683 INFO L85 PathProgramCache]: Analyzing trace with hash 276283816, now seen corresponding path program 1 times [2021-11-23 16:58:52,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:52,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2029457895] [2021-11-23 16:58:52,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:52,684 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:52,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:52,686 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:52,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-23 16:58:55,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:55,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 950 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:58:55,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:55,824 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:58:55,824 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:58:56,004 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:58:56,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:58:56,116 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 138 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:58:56,116 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:58:56,116 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:56,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2029457895] [2021-11-23 16:58:56,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2029457895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:58:56,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:58:56,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:58:56,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602535829] [2021-11-23 16:58:56,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:58:56,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:58:56,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:56,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:58:56,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:58:56,118 INFO L87 Difference]: Start difference. First operand 668 states and 969 transitions. Second operand has 4 states, 4 states have (on average 30.75) internal successors, (123), 4 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:58,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:00,845 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:02,853 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:04,371 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:04,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:04,893 INFO L93 Difference]: Finished difference Result 1342 states and 1950 transitions. [2021-11-23 16:59:04,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:59:04,895 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.75) internal successors, (123), 4 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) Word has length 149 [2021-11-23 16:59:04,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:04,898 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:59:04,898 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:59:04,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:04,899 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:04,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 137 Invalid, 1 Unknown, 39 Unchecked, 8.7s Time] [2021-11-23 16:59:04,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:59:04,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:59:04,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.449775112443778) internal successors, (967), 667 states have internal predecessors, (967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:04,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 967 transitions. [2021-11-23 16:59:04,912 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 967 transitions. Word has length 149 [2021-11-23 16:59:04,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:04,912 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 967 transitions. [2021-11-23 16:59:04,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.75) internal successors, (123), 4 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:04,912 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 967 transitions. [2021-11-23 16:59:04,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-23 16:59:04,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:04,913 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:04,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:05,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:05,126 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:05,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:05,126 INFO L85 PathProgramCache]: Analyzing trace with hash -341905400, now seen corresponding path program 1 times [2021-11-23 16:59:05,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:05,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [394141576] [2021-11-23 16:59:05,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:05,127 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:05,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:05,128 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:05,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 16:59:07,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:07,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:07,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:08,169 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:59:08,169 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:59:08,316 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:59:08,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:59:08,416 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 140 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:59:08,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:08,416 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:08,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [394141576] [2021-11-23 16:59:08,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [394141576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:08,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:08,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:08,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103635937] [2021-11-23 16:59:08,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:08,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:08,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:08,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:08,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:08,419 INFO L87 Difference]: Start difference. First operand 668 states and 967 transitions. Second operand has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:10,443 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:15,938 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:16,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:16,468 INFO L93 Difference]: Finished difference Result 1342 states and 1946 transitions. [2021-11-23 16:59:16,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:59:16,470 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 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 150 [2021-11-23 16:59:16,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:16,472 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:59:16,473 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:59:16,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:16,474 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:16,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 138 Invalid, 1 Unknown, 40 Unchecked, 8.0s Time] [2021-11-23 16:59:16,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:59:16,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:59:16,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.446776611694153) internal successors, (965), 667 states have internal predecessors, (965), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:16,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 965 transitions. [2021-11-23 16:59:16,484 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 965 transitions. Word has length 150 [2021-11-23 16:59:16,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:16,485 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 965 transitions. [2021-11-23 16:59:16,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.0) internal successors, (124), 4 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:16,485 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 965 transitions. [2021-11-23 16:59:16,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-23 16:59:16,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:16,486 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:16,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 16:59:16,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:16,687 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:16,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:16,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1868025656, now seen corresponding path program 1 times [2021-11-23 16:59:16,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:16,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2050665481] [2021-11-23 16:59:16,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:16,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:16,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:16,689 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:16,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 16:59:19,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:19,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 969 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:19,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:19,649 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:59:19,650 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:59:19,784 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:59:19,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:59:19,883 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 142 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:59:19,883 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:19,883 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:19,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2050665481] [2021-11-23 16:59:19,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2050665481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:19,884 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:19,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:19,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611996201] [2021-11-23 16:59:19,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:19,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:19,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:19,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:19,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:19,885 INFO L87 Difference]: Start difference. First operand 668 states and 965 transitions. Second operand has 4 states, 4 states have (on average 31.25) internal successors, (125), 4 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:21,903 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:25,888 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:27,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:27,881 INFO L93 Difference]: Finished difference Result 1342 states and 1942 transitions. [2021-11-23 16:59:27,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:59:27,883 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.25) internal successors, (125), 4 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-23 16:59:27,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:27,886 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:59:27,886 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:59:27,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:27,887 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:27,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 139 Invalid, 1 Unknown, 40 Unchecked, 8.0s Time] [2021-11-23 16:59:27,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:59:27,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:59:27,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4437781109445278) internal successors, (963), 667 states have internal predecessors, (963), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:27,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 963 transitions. [2021-11-23 16:59:27,901 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 963 transitions. Word has length 151 [2021-11-23 16:59:27,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:27,901 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 963 transitions. [2021-11-23 16:59:27,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.25) internal successors, (125), 4 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:27,901 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 963 transitions. [2021-11-23 16:59:27,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 16:59:27,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:27,903 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:27,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 16:59:28,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:28,103 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:28,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:28,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1046600570, now seen corresponding path program 1 times [2021-11-23 16:59:28,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:28,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [460018356] [2021-11-23 16:59:28,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:28,106 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:28,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:28,107 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:28,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 16:59:30,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:30,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 932 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:30,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:31,079 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:59:31,079 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:59:31,225 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:59:31,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:59:31,324 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:59:31,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:31,325 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:31,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [460018356] [2021-11-23 16:59:31,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [460018356] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:31,325 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:31,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:31,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656334969] [2021-11-23 16:59:31,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:31,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:31,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:31,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:31,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:31,326 INFO L87 Difference]: Start difference. First operand 668 states and 963 transitions. Second operand has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:33,344 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:37,132 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:38,579 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:40,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:40,140 INFO L93 Difference]: Finished difference Result 1342 states and 1938 transitions. [2021-11-23 16:59:40,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:59:40,142 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 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 152 [2021-11-23 16:59:40,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:40,144 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:59:40,145 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:59:40,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:40,146 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:40,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 140 Invalid, 1 Unknown, 41 Unchecked, 8.8s Time] [2021-11-23 16:59:40,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:59:40,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:59:40,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4407796101949026) internal successors, (961), 667 states have internal predecessors, (961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:40,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 961 transitions. [2021-11-23 16:59:40,163 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 961 transitions. Word has length 152 [2021-11-23 16:59:40,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:40,163 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 961 transitions. [2021-11-23 16:59:40,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:40,164 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 961 transitions. [2021-11-23 16:59:40,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-23 16:59:40,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:40,165 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:40,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:40,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:40,366 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:40,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:40,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1245043136, now seen corresponding path program 1 times [2021-11-23 16:59:40,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:40,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [717823856] [2021-11-23 16:59:40,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:40,367 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:40,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:40,368 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:40,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 16:59:42,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:42,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:42,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:43,321 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:59:43,322 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:59:43,526 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:59:43,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:59:43,665 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:59:43,665 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:43,665 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:43,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [717823856] [2021-11-23 16:59:43,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [717823856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:43,666 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:43,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:43,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857160927] [2021-11-23 16:59:43,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:43,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:43,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:43,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:43,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:43,667 INFO L87 Difference]: Start difference. First operand 668 states and 961 transitions. Second operand has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:45,686 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:50,675 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 16:59:51,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:51,666 INFO L93 Difference]: Finished difference Result 1342 states and 1934 transitions. [2021-11-23 16:59:51,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:59:51,668 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-23 16:59:51,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:51,671 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 16:59:51,671 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 16:59:51,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:51,672 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:51,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 1 Unknown, 41 Unchecked, 8.0s Time] [2021-11-23 16:59:51,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 16:59:51,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 16:59:51,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4377811094452773) internal successors, (959), 667 states have internal predecessors, (959), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:51,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 959 transitions. [2021-11-23 16:59:51,707 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 959 transitions. Word has length 155 [2021-11-23 16:59:51,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:51,707 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 959 transitions. [2021-11-23 16:59:51,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:51,708 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 959 transitions. [2021-11-23 16:59:51,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 16:59:51,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:51,710 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:51,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:51,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:51,934 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:51,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:51,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1316377403, now seen corresponding path program 1 times [2021-11-23 16:59:51,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:51,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [795022773] [2021-11-23 16:59:51,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:51,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:51,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:51,938 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:51,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 16:59:54,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:54,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 939 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:54,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:55,394 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 16:59:55,394 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 16:59:55,556 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 16:59:55,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 16:59:55,664 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 16:59:55,664 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:55,665 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:55,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [795022773] [2021-11-23 16:59:55,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [795022773] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:55,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:55,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:55,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546669980] [2021-11-23 16:59:55,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:55,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:55,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:55,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:55,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:55,666 INFO L87 Difference]: Start difference. First operand 668 states and 959 transitions. Second operand has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:57,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:02,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:02,730 INFO L93 Difference]: Finished difference Result 1342 states and 1930 transitions. [2021-11-23 17:00:02,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:00:02,731 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-23 17:00:02,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:02,734 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 17:00:02,734 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 17:00:02,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:02,735 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:02,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 142 Invalid, 1 Unknown, 42 Unchecked, 7.0s Time] [2021-11-23 17:00:02,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 17:00:02,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 17:00:02,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.434782608695652) internal successors, (957), 667 states have internal predecessors, (957), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:02,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 957 transitions. [2021-11-23 17:00:02,745 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 957 transitions. Word has length 156 [2021-11-23 17:00:02,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:02,746 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 957 transitions. [2021-11-23 17:00:02,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:02,746 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 957 transitions. [2021-11-23 17:00:02,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 17:00:02,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:02,747 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:02,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:02,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:02,948 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:02,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:02,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1807095559, now seen corresponding path program 1 times [2021-11-23 17:00:02,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:02,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [340868657] [2021-11-23 17:00:02,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:02,949 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:02,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:02,950 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:02,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 17:00:05,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:05,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:05,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:05,918 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 17:00:05,919 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 17:00:06,065 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 17:00:06,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 17:00:06,157 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 150 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:00:06,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:06,158 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:06,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [340868657] [2021-11-23 17:00:06,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [340868657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:06,158 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:06,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:06,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755215002] [2021-11-23 17:00:06,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:06,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:00:06,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:06,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:00:06,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:00:06,159 INFO L87 Difference]: Start difference. First operand 668 states and 957 transitions. Second operand has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:08,174 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:11,608 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:14,602 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:14,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:14,797 INFO L93 Difference]: Finished difference Result 1342 states and 1926 transitions. [2021-11-23 17:00:14,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:00:14,799 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-23 17:00:14,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:14,802 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 17:00:14,802 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 17:00:14,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:14,803 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:14,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 143 Invalid, 1 Unknown, 44 Unchecked, 8.6s Time] [2021-11-23 17:00:14,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 17:00:14,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 17:00:14,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.431784107946027) internal successors, (955), 667 states have internal predecessors, (955), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:14,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 955 transitions. [2021-11-23 17:00:14,814 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 955 transitions. Word has length 156 [2021-11-23 17:00:14,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:14,815 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 955 transitions. [2021-11-23 17:00:14,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:14,815 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 955 transitions. [2021-11-23 17:00:14,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 17:00:14,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:14,816 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:14,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:15,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:15,017 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:15,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:15,017 INFO L85 PathProgramCache]: Analyzing trace with hash -63733890, now seen corresponding path program 1 times [2021-11-23 17:00:15,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:15,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1321801396] [2021-11-23 17:00:15,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:15,018 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:15,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:15,019 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:15,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:00:17,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:17,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:17,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:17,905 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 17:00:17,906 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 17:00:18,084 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 17:00:18,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 17:00:18,187 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 152 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:00:18,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:18,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:18,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1321801396] [2021-11-23 17:00:18,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1321801396] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:18,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:18,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:18,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484401673] [2021-11-23 17:00:18,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:18,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:00:18,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:18,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:00:18,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:00:18,190 INFO L87 Difference]: Start difference. First operand 668 states and 955 transitions. Second operand has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:20,208 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:24,744 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:26,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:26,233 INFO L93 Difference]: Finished difference Result 1342 states and 1922 transitions. [2021-11-23 17:00:26,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:00:26,235 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2021-11-23 17:00:26,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:26,239 INFO L225 Difference]: With dead ends: 1342 [2021-11-23 17:00:26,239 INFO L226 Difference]: Without dead ends: 695 [2021-11-23 17:00:26,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:26,240 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:26,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 144 Invalid, 1 Unknown, 46 Unchecked, 8.0s Time] [2021-11-23 17:00:26,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-23 17:00:26,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 668. [2021-11-23 17:00:26,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.4287856071964018) internal successors, (953), 667 states have internal predecessors, (953), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:26,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 953 transitions. [2021-11-23 17:00:26,253 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 953 transitions. Word has length 157 [2021-11-23 17:00:26,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:26,253 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 953 transitions. [2021-11-23 17:00:26,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:26,253 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 953 transitions. [2021-11-23 17:00:26,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 17:00:26,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:26,255 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:26,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:26,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:26,457 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:26,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:26,458 INFO L85 PathProgramCache]: Analyzing trace with hash 448055082, now seen corresponding path program 1 times [2021-11-23 17:00:26,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:26,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [230659647] [2021-11-23 17:00:26,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:26,460 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:26,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:26,461 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:26,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:00:29,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:29,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 1008 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:29,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:29,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 50 treesize of output 38 [2021-11-23 17:00:29,498 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-11-23 17:00:29,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 78 treesize of output 93 [2021-11-23 17:00:29,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,538 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 17:00:29,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 41 [2021-11-23 17:00:29,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 17:00:29,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 41 [2021-11-23 17:00:29,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 17:00:29,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 13 [2021-11-23 17:00:30,065 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 17:00:30,851 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 17:00:30,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 74 treesize of output 26 [2021-11-23 17:00:30,902 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-23 17:00:30,902 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:30,902 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:30,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [230659647] [2021-11-23 17:00:30,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [230659647] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:30,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:30,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:30,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457316359] [2021-11-23 17:00:30,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:30,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:00:30,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:30,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:00:30,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:00:30,904 INFO L87 Difference]: Start difference. First operand 668 states and 953 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:32,931 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:36,315 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:40,746 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:43,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:43,077 INFO L93 Difference]: Finished difference Result 1428 states and 2054 transitions. [2021-11-23 17:00:43,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:00:43,079 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2021-11-23 17:00:43,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:43,081 INFO L225 Difference]: With dead ends: 1428 [2021-11-23 17:00:43,082 INFO L226 Difference]: Without dead ends: 781 [2021-11-23 17:00:43,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:43,083 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 47 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 594 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:43,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 594 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 201 Invalid, 1 Unknown, 0 Unchecked, 12.1s Time] [2021-11-23 17:00:43,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-11-23 17:00:43,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 728. [2021-11-23 17:00:43,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 728 states, 727 states have (on average 1.4456671251719395) internal successors, (1051), 727 states have internal predecessors, (1051), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:43,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 728 states to 728 states and 1051 transitions. [2021-11-23 17:00:43,101 INFO L78 Accepts]: Start accepts. Automaton has 728 states and 1051 transitions. Word has length 157 [2021-11-23 17:00:43,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:43,102 INFO L470 AbstractCegarLoop]: Abstraction has 728 states and 1051 transitions. [2021-11-23 17:00:43,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:43,102 INFO L276 IsEmpty]: Start isEmpty. Operand 728 states and 1051 transitions. [2021-11-23 17:00:43,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-23 17:00:43,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:43,104 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:43,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:43,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:43,326 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:43,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:43,327 INFO L85 PathProgramCache]: Analyzing trace with hash -480162223, now seen corresponding path program 1 times [2021-11-23 17:00:43,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:43,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2001770816] [2021-11-23 17:00:43,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:43,328 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:43,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:43,331 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:43,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 17:00:45,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:45,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:45,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:46,421 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 17:00:46,421 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 17:00:46,592 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 17:00:46,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 17:00:46,694 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 154 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:00:46,694 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:46,694 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:46,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2001770816] [2021-11-23 17:00:46,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2001770816] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:46,694 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:46,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:46,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238179890] [2021-11-23 17:00:46,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:46,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:00:46,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:46,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:00:46,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:00:46,696 INFO L87 Difference]: Start difference. First operand 728 states and 1051 transitions. Second operand has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:48,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:52,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 17:00:53,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:53,864 INFO L93 Difference]: Finished difference Result 1462 states and 2114 transitions. [2021-11-23 17:00:53,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:00:53,866 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-23 17:00:53,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:53,867 INFO L225 Difference]: With dead ends: 1462 [2021-11-23 17:00:53,867 INFO L226 Difference]: Without dead ends: 755 [2021-11-23 17:00:53,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:53,868 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 32 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 590 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:53,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 590 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 145 Invalid, 1 Unknown, 45 Unchecked, 7.1s Time] [2021-11-23 17:00:53,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-23 17:00:53,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 728. [2021-11-23 17:00:53,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 728 states, 727 states have (on average 1.4429160935350756) internal successors, (1049), 727 states have internal predecessors, (1049), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:53,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 728 states to 728 states and 1049 transitions. [2021-11-23 17:00:53,879 INFO L78 Accepts]: Start accepts. Automaton has 728 states and 1049 transitions. Word has length 158 [2021-11-23 17:00:53,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:53,879 INFO L470 AbstractCegarLoop]: Abstraction has 728 states and 1049 transitions. [2021-11-23 17:00:53,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:53,880 INFO L276 IsEmpty]: Start isEmpty. Operand 728 states and 1049 transitions. [2021-11-23 17:00:53,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:00:53,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:53,881 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:53,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:54,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:54,085 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:54,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:54,086 INFO L85 PathProgramCache]: Analyzing trace with hash -614844362, now seen corresponding path program 1 times [2021-11-23 17:00:54,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:54,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [181191423] [2021-11-23 17:00:54,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:54,088 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:54,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:54,088 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:54,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a5a6d8f-732b-4cb2-ac80-03b6b4187799/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:00:56,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:56,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:56,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:57,314 INFO L354 Elim1Store]: treesize reduction 1098, result has 5.7 percent of original size [2021-11-23 17:00:57,315 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 7 case distinctions, treesize of input 49 treesize of output 75 [2021-11-23 17:00:57,485 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-23 17:00:57,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 15 [2021-11-23 17:00:57,607 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 156 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 17:00:57,607 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:57,607 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:57,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [181191423] [2021-11-23 17:00:57,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [181191423] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:57,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:57,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:57,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362565262] [2021-11-23 17:00:57,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:57,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:00:57,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:57,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:00:57,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:00:57,609 INFO L87 Difference]: Start difference. First operand 728 states and 1049 transitions. Second operand has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 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) [2021-11-23 17:00:59,626 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers []