./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.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_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/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_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/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_3227fbac-d50a-43e7-af64-8b412a62a3d5/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 74d57b3f1e9a386b0ff6bac396d798184771ae1b1b0bb917f750fc3ebefb1c2f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:34:44,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:34:44,204 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:34:44,249 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:34:44,250 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:34:44,252 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:34:44,254 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:34:44,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:34:44,261 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:34:44,262 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:34:44,264 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:34:44,266 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:34:44,267 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:34:44,268 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:34:44,271 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:34:44,273 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:34:44,275 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:34:44,276 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:34:44,280 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:34:44,283 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:34:44,286 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:34:44,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:34:44,291 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:34:44,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:34:44,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:34:44,299 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:34:44,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:34:44,301 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:34:44,302 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:34:44,304 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:34:44,304 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:34:44,306 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:34:44,307 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:34:44,309 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:34:44,311 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:34:44,319 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:34:44,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:34:44,322 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:34:44,323 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:34:44,324 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:34:44,325 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:34:44,326 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:34:44,384 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:34:44,384 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:34:44,385 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:34:44,385 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:34:44,394 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:34:44,394 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:34:44,395 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:34:44,395 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:34:44,395 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:34:44,396 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:34:44,397 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:34:44,397 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:34:44,398 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:34:44,398 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:34:44,398 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:34:44,399 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:34:44,399 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:34:44,399 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:34:44,400 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:34:44,401 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:34:44,401 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:34:44,401 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:34:44,401 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:34:44,402 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:34:44,402 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:34:44,402 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:34:44,404 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:34:44,405 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:34:44,405 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:34:44,405 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:34:44,405 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:34:44,406 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:34:44,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:44,407 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:34:44,407 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:34:44,407 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:34:44,408 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:34:44,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:34:44,408 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:34:44,408 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:34:44,409 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:34:44,409 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74d57b3f1e9a386b0ff6bac396d798184771ae1b1b0bb917f750fc3ebefb1c2f [2021-11-23 17:34:44,712 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:34:44,738 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:34:44,741 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:34:44,743 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:34:44,744 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:34:44,746 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-23 17:34:44,861 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/36bea8022/d804b71c77a74007ae148fc92dd0a9d0/FLAG7e8033219 [2021-11-23 17:34:45,517 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:34:45,517 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-23 17:34:45,529 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/36bea8022/d804b71c77a74007ae148fc92dd0a9d0/FLAG7e8033219 [2021-11-23 17:34:45,771 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/36bea8022/d804b71c77a74007ae148fc92dd0a9d0 [2021-11-23 17:34:45,774 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:34:45,776 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:34:45,778 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:45,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:34:45,783 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:34:45,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:45" (1/1) ... [2021-11-23 17:34:45,786 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d2f6bcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:45, skipping insertion in model container [2021-11-23 17:34:45,786 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:45" (1/1) ... [2021-11-23 17:34:45,795 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:34:45,842 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:34:46,194 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6874,6887] [2021-11-23 17:34:46,216 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9049,9062] [2021-11-23 17:34:46,246 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:46,260 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:34:46,324 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6874,6887] [2021-11-23 17:34:46,337 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9049,9062] [2021-11-23 17:34:46,360 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:46,383 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:34:46,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46 WrapperNode [2021-11-23 17:34:46,384 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:46,385 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:46,385 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:34:46,386 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:34:46,396 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,410 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,462 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 445 [2021-11-23 17:34:46,471 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:46,472 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:34:46,473 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:34:46,473 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:34:46,486 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,511 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,512 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,522 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,529 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,533 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,538 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:34:46,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:34:46,556 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:34:46,556 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:34:46,557 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:46" (1/1) ... [2021-11-23 17:34:46,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:46,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:46,610 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:34:46,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:34:46,677 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:34:46,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:34:46,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:34:46,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:34:46,850 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:34:46,852 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:34:47,392 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:34:47,446 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 17:34:47,451 INFO L158 Benchmark]: Toolchain (without parser) took 1674.04ms. Allocated memory was 102.8MB in the beginning and 136.3MB in the end (delta: 33.6MB). Free memory was 67.8MB in the beginning and 72.0MB in the end (delta: -4.2MB). Peak memory consumption was 28.6MB. Max. memory is 16.1GB. [2021-11-23 17:34:47,452 INFO L158 Benchmark]: CDTParser took 0.38ms. Allocated memory is still 102.8MB. Free memory was 55.4MB in the beginning and 55.3MB in the end (delta: 76.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:34:47,454 INFO L158 Benchmark]: CACSL2BoogieTranslator took 606.03ms. Allocated memory was 102.8MB in the beginning and 136.3MB in the end (delta: 33.6MB). Free memory was 67.7MB in the beginning and 102.1MB in the end (delta: -34.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:34:47,458 INFO L158 Benchmark]: Boogie Procedure Inliner took 86.52ms. Allocated memory is still 136.3MB. Free memory was 102.1MB in the beginning and 99.9MB in the end (delta: 2.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:34:47,459 INFO L158 Benchmark]: Boogie Preprocessor took 66.13ms. Allocated memory is still 136.3MB. Free memory was 99.9MB in the beginning and 97.9MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:34:47,463 INFO L158 Benchmark]: RCFGBuilder took 893.61ms. Allocated memory is still 136.3MB. Free memory was 97.9MB in the beginning and 72.0MB in the end (delta: 25.9MB). Peak memory consumption was 27.3MB. Max. memory is 16.1GB. [2021-11-23 17:34:47,468 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38ms. Allocated memory is still 102.8MB. Free memory was 55.4MB in the beginning and 55.3MB in the end (delta: 76.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 606.03ms. Allocated memory was 102.8MB in the beginning and 136.3MB in the end (delta: 33.6MB). Free memory was 67.7MB in the beginning and 102.1MB in the end (delta: -34.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 86.52ms. Allocated memory is still 136.3MB. Free memory was 102.1MB in the beginning and 99.9MB in the end (delta: 2.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 66.13ms. Allocated memory is still 136.3MB. Free memory was 99.9MB in the beginning and 97.9MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 893.61ms. Allocated memory is still 136.3MB. Free memory was 97.9MB in the beginning and 72.0MB in the end (delta: 25.9MB). Peak memory consumption was 27.3MB. 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 17:34:47,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/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_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/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_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/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_3227fbac-d50a-43e7-af64-8b412a62a3d5/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 74d57b3f1e9a386b0ff6bac396d798184771ae1b1b0bb917f750fc3ebefb1c2f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:34:50,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:34:50,573 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:34:50,616 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:34:50,616 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:34:50,618 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:34:50,620 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:34:50,623 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:34:50,626 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:34:50,628 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:34:50,629 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:34:50,631 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:34:50,632 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:34:50,634 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:34:50,636 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:34:50,638 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:34:50,639 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:34:50,640 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:34:50,643 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:34:50,646 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:34:50,649 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:34:50,651 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:34:50,653 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:34:50,654 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:34:50,659 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:34:50,659 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:34:50,660 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:34:50,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:34:50,662 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:34:50,664 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:34:50,664 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:34:50,665 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:34:50,667 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:34:50,668 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:34:50,669 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:34:50,670 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:34:50,671 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:34:50,671 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:34:50,672 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:34:50,673 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:34:50,675 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:34:50,676 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:34:50,723 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:34:50,723 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:34:50,724 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:34:50,724 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:34:50,725 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:34:50,725 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:34:50,725 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:34:50,726 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:34:50,726 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:34:50,726 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:34:50,727 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:34:50,730 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:34:50,732 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:34:50,732 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:34:50,732 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:34:50,733 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:34:50,733 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:34:50,733 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:34:50,733 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:34:50,734 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:34:50,734 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:34:50,734 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:34:50,734 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:34:50,735 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:34:50,735 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:34:50,735 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:34:50,736 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:34:50,736 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:34:50,737 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:34:50,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:50,737 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:34:50,738 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:34:50,738 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:34:50,738 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:34:50,739 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:50,739 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:34:50,740 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:34:50,741 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:34:50,741 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74d57b3f1e9a386b0ff6bac396d798184771ae1b1b0bb917f750fc3ebefb1c2f [2021-11-23 17:34:51,252 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:34:51,287 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:34:51,294 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:34:51,296 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:34:51,297 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:34:51,299 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-23 17:34:51,393 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/0fe5db2ba/b1f376a1895f4755aff8e66440c432b3/FLAG106bf37c5 [2021-11-23 17:34:52,193 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:34:52,194 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-23 17:34:52,218 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/0fe5db2ba/b1f376a1895f4755aff8e66440c432b3/FLAG106bf37c5 [2021-11-23 17:34:52,429 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/data/0fe5db2ba/b1f376a1895f4755aff8e66440c432b3 [2021-11-23 17:34:52,437 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:34:52,441 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:34:52,444 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:52,444 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:34:52,450 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:34:52,451 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:52" (1/1) ... [2021-11-23 17:34:52,457 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76ed2035 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:52, skipping insertion in model container [2021-11-23 17:34:52,458 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:34:52" (1/1) ... [2021-11-23 17:34:52,467 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:34:52,546 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:34:52,903 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6874,6887] [2021-11-23 17:34:52,924 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9049,9062] [2021-11-23 17:34:52,937 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:52,968 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:34:53,056 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[6874,6887] [2021-11-23 17:34:53,071 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_3227fbac-d50a-43e7-af64-8b412a62a3d5/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c[9049,9062] [2021-11-23 17:34:53,082 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:34:53,105 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:34:53,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53 WrapperNode [2021-11-23 17:34:53,106 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:34:53,108 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:53,108 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:34:53,108 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:34:53,118 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,136 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,178 INFO L137 Inliner]: procedures = 23, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 436 [2021-11-23 17:34:53,178 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:34:53,179 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:34:53,180 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:34:53,180 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:34:53,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,197 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,198 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,219 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,223 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,229 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:34:53,231 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:34:53,231 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:34:53,231 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:34:53,233 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (1/1) ... [2021-11-23 17:34:53,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:34:53,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:53,283 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:34:53,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:34:53,357 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:34:53,357 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:34:53,358 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:34:53,358 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:34:53,489 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:34:53,492 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:34:54,071 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:34:54,081 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:34:54,081 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 17:34:54,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:34:54 BoogieIcfgContainer [2021-11-23 17:34:54,084 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:34:54,086 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:34:54,086 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:34:54,090 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:34:54,090 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:34:52" (1/3) ... [2021-11-23 17:34:54,091 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f851e2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:34:54, skipping insertion in model container [2021-11-23 17:34:54,091 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:34:53" (2/3) ... [2021-11-23 17:34:54,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f851e2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:34:54, skipping insertion in model container [2021-11-23 17:34:54,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:34:54" (3/3) ... [2021-11-23 17:34:54,094 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2021-11-23 17:34:54,100 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:34:54,101 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:34:54,165 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:34:54,174 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 17:34:54,174 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:34:54,196 INFO L276 IsEmpty]: Start isEmpty. Operand has 106 states, 103 states have (on average 1.7475728155339805) internal successors, (180), 105 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:54,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 17:34:54,208 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:54,208 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, 1, 1, 1, 1] [2021-11-23 17:34:54,209 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:54,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:54,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1096512752, now seen corresponding path program 1 times [2021-11-23 17:34:54,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:54,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [786115437] [2021-11-23 17:34:54,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:54,238 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:54,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:54,247 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:54,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:34:54,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:54,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:34:54,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:55,336 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 17:34:55,336 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:55,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:55,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [786115437] [2021-11-23 17:34:55,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [786115437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:55,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:55,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:34:55,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866397248] [2021-11-23 17:34:55,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:55,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:34:55,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:55,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:34:55,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:34:55,386 INFO L87 Difference]: Start difference. First operand has 106 states, 103 states have (on average 1.7475728155339805) internal successors, (180), 105 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:55,592 INFO L93 Difference]: Finished difference Result 202 states and 326 transitions. [2021-11-23 17:34:55,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:34:55,595 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 17:34:55,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:55,608 INFO L225 Difference]: With dead ends: 202 [2021-11-23 17:34:55,609 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:34:55,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:55,618 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 74 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:55,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 283 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:34:55,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:34:55,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:34:55,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3762376237623761) internal successors, (139), 102 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 139 transitions. [2021-11-23 17:34:55,670 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 139 transitions. Word has length 47 [2021-11-23 17:34:55,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:55,671 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 139 transitions. [2021-11-23 17:34:55,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,672 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 139 transitions. [2021-11-23 17:34:55,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 17:34:55,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:55,674 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, 1, 1, 1, 1, 1] [2021-11-23 17:34:55,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:55,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:55,888 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:55,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:55,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1406465301, now seen corresponding path program 1 times [2021-11-23 17:34:55,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:55,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1568843094] [2021-11-23 17:34:55,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:55,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:55,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:55,892 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:55,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:34:56,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:56,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:34:56,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:56,530 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 17:34:56,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:56,531 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:56,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1568843094] [2021-11-23 17:34:56,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1568843094] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:56,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:56,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:34:56,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409481544] [2021-11-23 17:34:56,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:56,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:34:56,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:56,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:34:56,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:34:56,537 INFO L87 Difference]: Start difference. First operand 103 states and 139 transitions. Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:56,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:56,670 INFO L93 Difference]: Finished difference Result 180 states and 251 transitions. [2021-11-23 17:34:56,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:34:56,671 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 17:34:56,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:56,674 INFO L225 Difference]: With dead ends: 180 [2021-11-23 17:34:56,674 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:34:56,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:56,677 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 18 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:56,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 215 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:34:56,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:34:56,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:34:56,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3663366336633664) internal successors, (138), 102 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:56,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 138 transitions. [2021-11-23 17:34:56,693 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 138 transitions. Word has length 48 [2021-11-23 17:34:56,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:56,694 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 138 transitions. [2021-11-23 17:34:56,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:56,694 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 138 transitions. [2021-11-23 17:34:56,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 17:34:56,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:56,697 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, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:56,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 17:34:56,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:56,918 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:56,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:56,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1337580164, now seen corresponding path program 1 times [2021-11-23 17:34:56,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:56,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1185575605] [2021-11-23 17:34:56,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:56,921 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:56,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:56,923 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:56,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:34:57,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:57,507 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 17:34:57,507 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:57,508 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:57,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1185575605] [2021-11-23 17:34:57,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1185575605] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:57,514 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:57,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:34:57,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351648783] [2021-11-23 17:34:57,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:57,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:34:57,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:57,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:34:57,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:34:57,518 INFO L87 Difference]: Start difference. First operand 103 states and 138 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:57,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:57,656 INFO L93 Difference]: Finished difference Result 176 states and 245 transitions. [2021-11-23 17:34:57,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:34:57,657 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-23 17:34:57,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:57,658 INFO L225 Difference]: With dead ends: 176 [2021-11-23 17:34:57,659 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:34:57,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:57,661 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 12 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:57,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 218 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-23 17:34:57,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:34:57,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:34:57,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3564356435643565) internal successors, (137), 102 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:57,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 137 transitions. [2021-11-23 17:34:57,673 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 137 transitions. Word has length 49 [2021-11-23 17:34:57,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:57,674 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 137 transitions. [2021-11-23 17:34:57,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:57,675 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 137 transitions. [2021-11-23 17:34:57,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 17:34:57,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:57,677 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:57,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:57,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:57,891 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:57,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:57,892 INFO L85 PathProgramCache]: Analyzing trace with hash -642831873, now seen corresponding path program 1 times [2021-11-23 17:34:57,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:57,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [138636295] [2021-11-23 17:34:57,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,894 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:57,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:57,895 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:34:58,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:58,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:34:58,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:58,831 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 17:34:58,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:58,831 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:58,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [138636295] [2021-11-23 17:34:58,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [138636295] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:58,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:58,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:34:58,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952022384] [2021-11-23 17:34:58,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:58,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 17:34:58,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:58,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 17:34:58,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:34:58,836 INFO L87 Difference]: Start difference. First operand 103 states and 137 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:58,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:58,936 INFO L93 Difference]: Finished difference Result 165 states and 230 transitions. [2021-11-23 17:34:58,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 17:34:58,937 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 17:34:58,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:58,939 INFO L225 Difference]: With dead ends: 165 [2021-11-23 17:34:58,939 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:34:58,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:34:58,941 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 17 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:58,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 465 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 130 Unchecked, 0.1s Time] [2021-11-23 17:34:58,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:34:58,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:34:58,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 102 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:58,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 136 transitions. [2021-11-23 17:34:58,953 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 136 transitions. Word has length 50 [2021-11-23 17:34:58,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:58,953 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 136 transitions. [2021-11-23 17:34:58,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:58,954 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 136 transitions. [2021-11-23 17:34:58,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:34:58,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:58,956 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:58,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:59,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:59,170 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:59,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:59,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1083037866, now seen corresponding path program 1 times [2021-11-23 17:34:59,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:59,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1918102161] [2021-11-23 17:34:59,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:59,175 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:59,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:59,176 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:59,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:34:59,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:59,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:34:59,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:00,416 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 17:35:00,423 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:00,424 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:00,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1918102161] [2021-11-23 17:35:00,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1918102161] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:00,425 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:00,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 17:35:00,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418702961] [2021-11-23 17:35:00,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:00,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:35:00,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:00,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:35:00,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:35:00,428 INFO L87 Difference]: Start difference. First operand 103 states and 136 transitions. Second operand has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 8 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:00,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:00,556 INFO L93 Difference]: Finished difference Result 160 states and 221 transitions. [2021-11-23 17:35:00,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:35:00,557 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 8 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-23 17:35:00,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:00,558 INFO L225 Difference]: With dead ends: 160 [2021-11-23 17:35:00,559 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:35:00,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:00,561 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 29 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:00,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 519 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 66 Invalid, 0 Unknown, 132 Unchecked, 0.1s Time] [2021-11-23 17:35:00,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:35:00,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:35:00,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3366336633663367) internal successors, (135), 102 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:00,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 135 transitions. [2021-11-23 17:35:00,586 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 135 transitions. Word has length 51 [2021-11-23 17:35:00,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:00,587 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 135 transitions. [2021-11-23 17:35:00,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.666666666666667) internal successors, (51), 8 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:00,587 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 135 transitions. [2021-11-23 17:35:00,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:35:00,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:00,595 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:00,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:00,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:00,810 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:00,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:00,811 INFO L85 PathProgramCache]: Analyzing trace with hash -62816298, now seen corresponding path program 1 times [2021-11-23 17:35:00,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:00,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2047513840] [2021-11-23 17:35:00,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:00,812 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:00,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:00,814 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:00,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:35:00,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:00,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:00,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:01,999 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 17:35:02,000 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:02,000 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:02,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2047513840] [2021-11-23 17:35:02,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2047513840] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:02,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:02,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 17:35:02,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439663600] [2021-11-23 17:35:02,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:02,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:35:02,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:02,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:35:02,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:35:02,005 INFO L87 Difference]: Start difference. First operand 103 states and 135 transitions. Second operand has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:02,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:02,115 INFO L93 Difference]: Finished difference Result 155 states and 212 transitions. [2021-11-23 17:35:02,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:35:02,115 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-23 17:35:02,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:02,117 INFO L225 Difference]: With dead ends: 155 [2021-11-23 17:35:02,117 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 17:35:02,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:02,119 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 24 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 176 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:02,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 632 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 176 Unchecked, 0.1s Time] [2021-11-23 17:35:02,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 17:35:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-23 17:35:02,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 101 states have (on average 1.3267326732673268) internal successors, (134), 102 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:02,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2021-11-23 17:35:02,133 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 52 [2021-11-23 17:35:02,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:02,134 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2021-11-23 17:35:02,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:02,134 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2021-11-23 17:35:02,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:35:02,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:02,140 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:02,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:02,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:02,357 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:02,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:02,358 INFO L85 PathProgramCache]: Analyzing trace with hash -320680429, now seen corresponding path program 1 times [2021-11-23 17:35:02,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:02,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [768681467] [2021-11-23 17:35:02,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:02,359 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:02,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:02,360 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:02,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:35:02,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:02,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:02,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:03,019 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 17:35:03,020 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:03,020 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:03,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [768681467] [2021-11-23 17:35:03,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [768681467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:03,021 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:03,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:03,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583887211] [2021-11-23 17:35:03,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:03,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:03,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:03,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:03,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:03,024 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand has 5 states, 5 states have (on average 10.6) internal successors, (53), 5 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:03,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:03,230 INFO L93 Difference]: Finished difference Result 315 states and 451 transitions. [2021-11-23 17:35:03,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:35:03,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 5 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 17:35:03,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:03,235 INFO L225 Difference]: With dead ends: 315 [2021-11-23 17:35:03,235 INFO L226 Difference]: Without dead ends: 269 [2021-11-23 17:35:03,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:03,237 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 281 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 476 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:03,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 476 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:35:03,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-23 17:35:03,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 205. [2021-11-23 17:35:03,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 203 states have (on average 1.4236453201970443) internal successors, (289), 204 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:03,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 289 transitions. [2021-11-23 17:35:03,271 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 289 transitions. Word has length 53 [2021-11-23 17:35:03,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:03,272 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 289 transitions. [2021-11-23 17:35:03,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.6) internal successors, (53), 5 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:03,272 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 289 transitions. [2021-11-23 17:35:03,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:35:03,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:03,275 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:03,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:03,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:03,489 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:03,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:03,490 INFO L85 PathProgramCache]: Analyzing trace with hash -736137664, now seen corresponding path program 1 times [2021-11-23 17:35:03,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:03,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1244073813] [2021-11-23 17:35:03,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:03,491 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:03,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:03,492 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:03,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:35:03,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:03,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:03,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:04,002 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 17:35:04,003 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:04,003 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:04,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1244073813] [2021-11-23 17:35:04,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1244073813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:04,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:04,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:04,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2199714] [2021-11-23 17:35:04,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:04,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:04,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:04,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:04,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:04,006 INFO L87 Difference]: Start difference. First operand 205 states and 289 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:04,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:04,174 INFO L93 Difference]: Finished difference Result 402 states and 583 transitions. [2021-11-23 17:35:04,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:35:04,175 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:35:04,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:04,178 INFO L225 Difference]: With dead ends: 402 [2021-11-23 17:35:04,178 INFO L226 Difference]: Without dead ends: 357 [2021-11-23 17:35:04,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:04,180 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 281 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:04,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 508 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:35:04,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-23 17:35:04,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 298. [2021-11-23 17:35:04,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 296 states have (on average 1.445945945945946) internal successors, (428), 297 states have internal predecessors, (428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:04,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 428 transitions. [2021-11-23 17:35:04,211 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 428 transitions. Word has length 54 [2021-11-23 17:35:04,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:04,212 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 428 transitions. [2021-11-23 17:35:04,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:04,213 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 428 transitions. [2021-11-23 17:35:04,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:35:04,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:04,214 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:04,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:04,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:04,431 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:04,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:04,432 INFO L85 PathProgramCache]: Analyzing trace with hash 1971894049, now seen corresponding path program 1 times [2021-11-23 17:35:04,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:04,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1925211504] [2021-11-23 17:35:04,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:04,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:04,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:04,434 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:04,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:35:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:04,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:04,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:04,914 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 17:35:04,914 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:04,914 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:04,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1925211504] [2021-11-23 17:35:04,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1925211504] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:04,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:04,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:04,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304493966] [2021-11-23 17:35:04,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:04,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:04,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:04,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:04,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:04,917 INFO L87 Difference]: Start difference. First operand 298 states and 428 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:05,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:05,102 INFO L93 Difference]: Finished difference Result 441 states and 642 transitions. [2021-11-23 17:35:05,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:35:05,103 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:35:05,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:05,106 INFO L225 Difference]: With dead ends: 441 [2021-11-23 17:35:05,106 INFO L226 Difference]: Without dead ends: 314 [2021-11-23 17:35:05,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:05,108 INFO L933 BasicCegarLoop]: 316 mSDtfsCounter, 270 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 646 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:05,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [270 Valid, 646 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:35:05,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-11-23 17:35:05,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 251. [2021-11-23 17:35:05,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 249 states have (on average 1.4216867469879517) internal successors, (354), 250 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:05,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 354 transitions. [2021-11-23 17:35:05,143 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 354 transitions. Word has length 54 [2021-11-23 17:35:05,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:05,144 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 354 transitions. [2021-11-23 17:35:05,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:05,144 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 354 transitions. [2021-11-23 17:35:05,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:35:05,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:05,146 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:05,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:05,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:05,360 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:05,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:05,360 INFO L85 PathProgramCache]: Analyzing trace with hash 1680530911, now seen corresponding path program 1 times [2021-11-23 17:35:05,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:05,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [846369324] [2021-11-23 17:35:05,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:05,361 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:05,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:05,363 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:05,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:35:05,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:05,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:05,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:05,873 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 17:35:05,873 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:05,874 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:05,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [846369324] [2021-11-23 17:35:05,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [846369324] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:05,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:05,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:05,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943734246] [2021-11-23 17:35:05,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:05,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:05,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:05,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:05,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:05,878 INFO L87 Difference]: Start difference. First operand 251 states and 354 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:06,069 INFO L93 Difference]: Finished difference Result 409 states and 587 transitions. [2021-11-23 17:35:06,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:35:06,096 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:35:06,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:06,099 INFO L225 Difference]: With dead ends: 409 [2021-11-23 17:35:06,100 INFO L226 Difference]: Without dead ends: 364 [2021-11-23 17:35:06,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:06,101 INFO L933 BasicCegarLoop]: 277 mSDtfsCounter, 335 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:06,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 600 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:35:06,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-11-23 17:35:06,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 292. [2021-11-23 17:35:06,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 290 states have (on average 1.4379310344827587) internal successors, (417), 291 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 417 transitions. [2021-11-23 17:35:06,125 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 417 transitions. Word has length 54 [2021-11-23 17:35:06,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:06,126 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 417 transitions. [2021-11-23 17:35:06,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,127 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 417 transitions. [2021-11-23 17:35:06,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:35:06,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:06,128 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:06,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:06,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:06,342 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:06,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:06,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1521991144, now seen corresponding path program 1 times [2021-11-23 17:35:06,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:06,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [348380165] [2021-11-23 17:35:06,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:06,344 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:06,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:06,345 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:06,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:35:06,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:06,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:06,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:07,749 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 17:35:07,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:07,750 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:07,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [348380165] [2021-11-23 17:35:07,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [348380165] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:07,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:07,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-23 17:35:07,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41288900] [2021-11-23 17:35:07,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:07,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 17:35:07,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:07,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 17:35:07,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:07,753 INFO L87 Difference]: Start difference. First operand 292 states and 417 transitions. Second operand has 10 states, 10 states have (on average 5.5) internal successors, (55), 10 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:07,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:07,831 INFO L93 Difference]: Finished difference Result 353 states and 505 transitions. [2021-11-23 17:35:07,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:35:07,832 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.5) internal successors, (55), 10 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:35:07,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:07,835 INFO L225 Difference]: With dead ends: 353 [2021-11-23 17:35:07,835 INFO L226 Difference]: Without dead ends: 287 [2021-11-23 17:35:07,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:35:07,837 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 23 mSDsluCounter, 622 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:07,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 741 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 82 Unchecked, 0.0s Time] [2021-11-23 17:35:07,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-23 17:35:07,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2021-11-23 17:35:07,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 285 states have (on average 1.431578947368421) internal successors, (408), 286 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 17:35:07,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 408 transitions. [2021-11-23 17:35:07,856 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 408 transitions. Word has length 55 [2021-11-23 17:35:07,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:07,857 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 408 transitions. [2021-11-23 17:35:07,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 5.5) internal successors, (55), 10 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:07,857 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 408 transitions. [2021-11-23 17:35:07,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:35:07,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:07,861 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:07,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:08,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:08,076 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:08,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:08,076 INFO L85 PathProgramCache]: Analyzing trace with hash 822613335, now seen corresponding path program 1 times [2021-11-23 17:35:08,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:08,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1527414584] [2021-11-23 17:35:08,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:08,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:08,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:08,078 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:08,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:35:08,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:08,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:35:08,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:12,435 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 17:35:12,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:12,435 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:12,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1527414584] [2021-11-23 17:35:12,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1527414584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:12,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:12,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-11-23 17:35:12,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71280879] [2021-11-23 17:35:12,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:12,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:35:12,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:12,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:35:12,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:35:12,437 INFO L87 Difference]: Start difference. First operand 287 states and 408 transitions. Second operand has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:12,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:12,651 INFO L93 Difference]: Finished difference Result 303 states and 426 transitions. [2021-11-23 17:35:12,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:35:12,652 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:35:12,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:12,655 INFO L225 Difference]: With dead ends: 303 [2021-11-23 17:35:12,655 INFO L226 Difference]: Without dead ends: 296 [2021-11-23 17:35:12,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:35:12,657 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 47 mSDsluCounter, 1026 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 1131 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 384 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:12,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 1131 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 384 Unchecked, 0.1s Time] [2021-11-23 17:35:12,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-23 17:35:12,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2021-11-23 17:35:12,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 294 states have (on average 1.4251700680272108) internal successors, (419), 295 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:12,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 419 transitions. [2021-11-23 17:35:12,676 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 419 transitions. Word has length 55 [2021-11-23 17:35:12,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:12,677 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 419 transitions. [2021-11-23 17:35:12,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:12,678 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 419 transitions. [2021-11-23 17:35:12,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:35:12,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:12,683 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:12,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:12,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:12,898 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:12,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:12,899 INFO L85 PathProgramCache]: Analyzing trace with hash 380290649, now seen corresponding path program 1 times [2021-11-23 17:35:12,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:12,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [124402703] [2021-11-23 17:35:12,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:12,900 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:12,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:12,902 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:12,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:35:13,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:13,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:13,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:13,836 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 17:35:13,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:13,836 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:13,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [124402703] [2021-11-23 17:35:13,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [124402703] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:13,837 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:13,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 17:35:13,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668143429] [2021-11-23 17:35:13,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:13,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:35:13,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:13,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:35:13,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:35:13,840 INFO L87 Difference]: Start difference. First operand 296 states and 419 transitions. Second operand has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:13,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:13,917 INFO L93 Difference]: Finished difference Result 346 states and 492 transitions. [2021-11-23 17:35:13,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:35:13,918 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:35:13,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:13,921 INFO L225 Difference]: With dead ends: 346 [2021-11-23 17:35:13,921 INFO L226 Difference]: Without dead ends: 280 [2021-11-23 17:35:13,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:13,924 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 26 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:13,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 411 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 45 Unchecked, 0.0s Time] [2021-11-23 17:35:13,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-23 17:35:13,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 280. [2021-11-23 17:35:13,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 278 states have (on average 1.4280575539568345) internal successors, (397), 279 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:13,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 397 transitions. [2021-11-23 17:35:13,944 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 397 transitions. Word has length 55 [2021-11-23 17:35:13,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:13,945 INFO L470 AbstractCegarLoop]: Abstraction has 280 states and 397 transitions. [2021-11-23 17:35:13,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:13,945 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 397 transitions. [2021-11-23 17:35:13,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 17:35:13,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:13,946 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:13,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:14,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:14,160 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:14,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:14,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1258334466, now seen corresponding path program 1 times [2021-11-23 17:35:14,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:14,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [381739656] [2021-11-23 17:35:14,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:14,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:14,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:14,163 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:14,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:35:14,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:14,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:14,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:15,371 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 17:35:15,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:15,372 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:15,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [381739656] [2021-11-23 17:35:15,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [381739656] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:15,372 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:15,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-23 17:35:15,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566773268] [2021-11-23 17:35:15,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:15,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 17:35:15,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:15,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 17:35:15,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:15,373 INFO L87 Difference]: Start difference. First operand 280 states and 397 transitions. Second operand has 10 states, 10 states have (on average 5.6) internal successors, (56), 10 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 17:35:15,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:15,458 INFO L93 Difference]: Finished difference Result 280 states and 397 transitions. [2021-11-23 17:35:15,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:35:15,459 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 10 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 17:35:15,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:15,462 INFO L225 Difference]: With dead ends: 280 [2021-11-23 17:35:15,462 INFO L226 Difference]: Without dead ends: 273 [2021-11-23 17:35:15,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:35:15,463 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 25 mSDsluCounter, 668 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 781 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:15,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 781 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 92 Unchecked, 0.0s Time] [2021-11-23 17:35:15,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-23 17:35:15,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 264. [2021-11-23 17:35:15,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.44106463878327) internal successors, (379), 263 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 17:35:15,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 379 transitions. [2021-11-23 17:35:15,482 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 379 transitions. Word has length 56 [2021-11-23 17:35:15,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:15,483 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 379 transitions. [2021-11-23 17:35:15,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 5.6) internal successors, (56), 10 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 17:35:15,483 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 379 transitions. [2021-11-23 17:35:15,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:35:15,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:15,485 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, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:15,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:15,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:15,699 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:15,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:15,700 INFO L85 PathProgramCache]: Analyzing trace with hash 376463809, now seen corresponding path program 1 times [2021-11-23 17:35:15,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:15,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2100749374] [2021-11-23 17:35:15,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:15,701 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:15,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:15,701 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:15,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:35:15,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:15,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:35:15,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:16,861 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 17:35:16,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:16,861 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:16,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2100749374] [2021-11-23 17:35:16,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2100749374] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:16,862 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:16,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 17:35:16,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394861830] [2021-11-23 17:35:16,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:16,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:35:16,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:16,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:35:16,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:35:16,865 INFO L87 Difference]: Start difference. First operand 264 states and 379 transitions. Second operand has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 8 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:16,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:16,893 INFO L93 Difference]: Finished difference Result 492 states and 724 transitions. [2021-11-23 17:35:16,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 17:35:16,894 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 8 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-23 17:35:16,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:16,896 INFO L225 Difference]: With dead ends: 492 [2021-11-23 17:35:16,896 INFO L226 Difference]: Without dead ends: 285 [2021-11-23 17:35:16,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:35:16,898 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 36 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:16,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 425 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 88 Unchecked, 0.0s Time] [2021-11-23 17:35:16,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-23 17:35:16,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 283. [2021-11-23 17:35:16,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.4219858156028369) internal successors, (401), 282 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:16,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 401 transitions. [2021-11-23 17:35:16,918 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 401 transitions. Word has length 75 [2021-11-23 17:35:16,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:16,919 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 401 transitions. [2021-11-23 17:35:16,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.333333333333334) internal successors, (75), 8 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:16,919 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 401 transitions. [2021-11-23 17:35:16,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:35:16,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:16,921 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, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:16,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:17,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:17,135 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:17,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:17,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1531780676, now seen corresponding path program 1 times [2021-11-23 17:35:17,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:17,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [81751021] [2021-11-23 17:35:17,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:17,138 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:17,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:17,139 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:17,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:35:17,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:17,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:17,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:17,382 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 17:35:17,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:17,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:17,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [81751021] [2021-11-23 17:35:17,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [81751021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:17,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:17,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:17,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441234108] [2021-11-23 17:35:17,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:17,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:17,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:17,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:17,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:17,386 INFO L87 Difference]: Start difference. First operand 283 states and 401 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:17,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:17,425 INFO L93 Difference]: Finished difference Result 657 states and 974 transitions. [2021-11-23 17:35:17,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:17,425 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-23 17:35:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:17,430 INFO L225 Difference]: With dead ends: 657 [2021-11-23 17:35:17,431 INFO L226 Difference]: Without dead ends: 450 [2021-11-23 17:35:17,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 73 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 17:35:17,432 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 69 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:17,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 243 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:35:17,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-11-23 17:35:17,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 448. [2021-11-23 17:35:17,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 1.4519015659955257) internal successors, (649), 447 states have internal predecessors, (649), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:17,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 649 transitions. [2021-11-23 17:35:17,468 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 649 transitions. Word has length 75 [2021-11-23 17:35:17,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:17,469 INFO L470 AbstractCegarLoop]: Abstraction has 448 states and 649 transitions. [2021-11-23 17:35:17,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:17,469 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 649 transitions. [2021-11-23 17:35:17,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 17:35:17,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:17,470 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:17,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:17,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:17,685 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:17,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:17,686 INFO L85 PathProgramCache]: Analyzing trace with hash -334784308, now seen corresponding path program 1 times [2021-11-23 17:35:17,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:17,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1094299731] [2021-11-23 17:35:17,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:17,687 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:17,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:17,688 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:17,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:35:17,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:17,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:17,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:17,929 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 17:35:17,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:17,930 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:17,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1094299731] [2021-11-23 17:35:17,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1094299731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:17,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:17,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:17,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064193329] [2021-11-23 17:35:17,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:17,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:17,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:17,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:17,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:17,933 INFO L87 Difference]: Start difference. First operand 448 states and 649 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:17,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:17,997 INFO L93 Difference]: Finished difference Result 1112 states and 1653 transitions. [2021-11-23 17:35:17,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:17,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-23 17:35:17,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:18,004 INFO L225 Difference]: With dead ends: 1112 [2021-11-23 17:35:18,004 INFO L226 Difference]: Without dead ends: 740 [2021-11-23 17:35:18,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 74 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 17:35:18,007 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 62 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:18,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 240 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:35:18,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 740 states. [2021-11-23 17:35:18,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 740 to 738. [2021-11-23 17:35:18,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 738 states, 737 states have (on average 1.4586160108548167) internal successors, (1075), 737 states have internal predecessors, (1075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:18,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 738 states to 738 states and 1075 transitions. [2021-11-23 17:35:18,058 INFO L78 Accepts]: Start accepts. Automaton has 738 states and 1075 transitions. Word has length 76 [2021-11-23 17:35:18,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:18,058 INFO L470 AbstractCegarLoop]: Abstraction has 738 states and 1075 transitions. [2021-11-23 17:35:18,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:18,059 INFO L276 IsEmpty]: Start isEmpty. Operand 738 states and 1075 transitions. [2021-11-23 17:35:18,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 17:35:18,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:18,060 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:18,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:18,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:18,275 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:18,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:18,275 INFO L85 PathProgramCache]: Analyzing trace with hash 1567429870, now seen corresponding path program 1 times [2021-11-23 17:35:18,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:18,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1125785158] [2021-11-23 17:35:18,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:18,276 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:18,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:18,277 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:18,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:35:18,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:18,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:18,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:19,814 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 17:35:19,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:19,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:19,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1125785158] [2021-11-23 17:35:19,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1125785158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:19,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:19,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 17:35:19,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17168223] [2021-11-23 17:35:19,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:19,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 17:35:19,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:19,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 17:35:19,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:19,818 INFO L87 Difference]: Start difference. First operand 738 states and 1075 transitions. Second operand has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:19,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:19,926 INFO L93 Difference]: Finished difference Result 1430 states and 2106 transitions. [2021-11-23 17:35:19,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:35:19,927 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-23 17:35:19,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:19,932 INFO L225 Difference]: With dead ends: 1430 [2021-11-23 17:35:19,933 INFO L226 Difference]: Without dead ends: 768 [2021-11-23 17:35:19,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:35:19,935 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 36 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:19,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 592 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 124 Unchecked, 0.0s Time] [2021-11-23 17:35:19,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2021-11-23 17:35:19,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 766. [2021-11-23 17:35:19,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 766 states, 765 states have (on average 1.449673202614379) internal successors, (1109), 765 states have internal predecessors, (1109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:19,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 766 states to 766 states and 1109 transitions. [2021-11-23 17:35:19,983 INFO L78 Accepts]: Start accepts. Automaton has 766 states and 1109 transitions. Word has length 77 [2021-11-23 17:35:19,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:19,984 INFO L470 AbstractCegarLoop]: Abstraction has 766 states and 1109 transitions. [2021-11-23 17:35:19,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:19,984 INFO L276 IsEmpty]: Start isEmpty. Operand 766 states and 1109 transitions. [2021-11-23 17:35:19,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 17:35:19,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:19,986 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:20,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:20,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:20,200 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:20,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:20,200 INFO L85 PathProgramCache]: Analyzing trace with hash 1038139369, now seen corresponding path program 1 times [2021-11-23 17:35:20,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:20,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1552008921] [2021-11-23 17:35:20,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:20,201 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:20,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:20,203 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:20,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:35:20,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:20,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:35:20,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:20,709 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 17:35:20,709 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:20,710 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:20,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1552008921] [2021-11-23 17:35:20,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1552008921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:20,710 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:20,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:35:20,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601536344] [2021-11-23 17:35:20,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:20,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:35:20,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:20,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:35:20,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:20,715 INFO L87 Difference]: Start difference. First operand 766 states and 1109 transitions. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:20,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:20,796 INFO L93 Difference]: Finished difference Result 1450 states and 2133 transitions. [2021-11-23 17:35:20,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:35:20,797 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-23 17:35:20,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:20,808 INFO L225 Difference]: With dead ends: 1450 [2021-11-23 17:35:20,808 INFO L226 Difference]: Without dead ends: 788 [2021-11-23 17:35:20,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:20,811 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 16 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:20,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 291 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:35:20,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2021-11-23 17:35:20,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 787. [2021-11-23 17:35:20,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 787 states, 786 states have (on average 1.4465648854961832) internal successors, (1137), 786 states have internal predecessors, (1137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:20,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 787 states to 787 states and 1137 transitions. [2021-11-23 17:35:20,880 INFO L78 Accepts]: Start accepts. Automaton has 787 states and 1137 transitions. Word has length 77 [2021-11-23 17:35:20,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:20,880 INFO L470 AbstractCegarLoop]: Abstraction has 787 states and 1137 transitions. [2021-11-23 17:35:20,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:20,881 INFO L276 IsEmpty]: Start isEmpty. Operand 787 states and 1137 transitions. [2021-11-23 17:35:20,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:35:20,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:20,885 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:20,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:21,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:21,099 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:21,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:21,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1695604898, now seen corresponding path program 1 times [2021-11-23 17:35:21,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:21,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1803894484] [2021-11-23 17:35:21,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:21,101 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:21,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:21,102 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:21,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:35:21,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:21,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:35:21,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:21,412 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 17:35:21,413 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:21,413 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:21,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1803894484] [2021-11-23 17:35:21,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1803894484] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:21,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:21,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:21,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089401156] [2021-11-23 17:35:21,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:21,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:21,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:21,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:21,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:21,419 INFO L87 Difference]: Start difference. First operand 787 states and 1137 transitions. Second operand has 5 states, 5 states have (on average 15.6) internal successors, (78), 5 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 17:35:21,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:21,603 INFO L93 Difference]: Finished difference Result 1576 states and 2273 transitions. [2021-11-23 17:35:21,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:35:21,604 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 5 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 78 [2021-11-23 17:35:21,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:21,616 INFO L225 Difference]: With dead ends: 1576 [2021-11-23 17:35:21,616 INFO L226 Difference]: Without dead ends: 1574 [2021-11-23 17:35:21,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:35:21,618 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 206 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:21,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 514 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:35:21,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1574 states. [2021-11-23 17:35:21,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1574 to 847. [2021-11-23 17:35:21,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 846 states have (on average 1.4148936170212767) internal successors, (1197), 846 states have internal predecessors, (1197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:21,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 1197 transitions. [2021-11-23 17:35:21,717 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 1197 transitions. Word has length 78 [2021-11-23 17:35:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:21,718 INFO L470 AbstractCegarLoop]: Abstraction has 847 states and 1197 transitions. [2021-11-23 17:35:21,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 5 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 17:35:21,718 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 1197 transitions. [2021-11-23 17:35:21,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:35:21,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:21,720 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:21,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:21,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:21,937 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:21,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:21,938 INFO L85 PathProgramCache]: Analyzing trace with hash -637251251, now seen corresponding path program 1 times [2021-11-23 17:35:21,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:21,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1884761805] [2021-11-23 17:35:21,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:21,939 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:21,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:21,940 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:21,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:35:22,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:22,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:35:22,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:22,527 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 17:35:22,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:22,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:22,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1884761805] [2021-11-23 17:35:22,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1884761805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:22,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:22,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:35:22,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990644962] [2021-11-23 17:35:22,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:22,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:35:22,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:22,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:35:22,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:22,531 INFO L87 Difference]: Start difference. First operand 847 states and 1197 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:22,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:22,610 INFO L93 Difference]: Finished difference Result 1572 states and 2255 transitions. [2021-11-23 17:35:22,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:35:22,611 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-23 17:35:22,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:22,617 INFO L225 Difference]: With dead ends: 1572 [2021-11-23 17:35:22,618 INFO L226 Difference]: Without dead ends: 850 [2021-11-23 17:35:22,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:22,620 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 16 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:22,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 290 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:35:22,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2021-11-23 17:35:22,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 849. [2021-11-23 17:35:22,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 848 states have (on average 1.4139150943396226) internal successors, (1199), 848 states have internal predecessors, (1199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:22,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1199 transitions. [2021-11-23 17:35:22,701 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1199 transitions. Word has length 79 [2021-11-23 17:35:22,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:22,702 INFO L470 AbstractCegarLoop]: Abstraction has 849 states and 1199 transitions. [2021-11-23 17:35:22,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:22,702 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1199 transitions. [2021-11-23 17:35:22,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:35:22,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:22,704 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:22,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:22,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:22,928 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:22,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:22,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1140192055, now seen corresponding path program 1 times [2021-11-23 17:35:22,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:22,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1313283907] [2021-11-23 17:35:22,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:22,930 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:22,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:22,931 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:22,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:35:23,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:23,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:23,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:23,174 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 17:35:23,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:23,174 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:23,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1313283907] [2021-11-23 17:35:23,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1313283907] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:23,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:23,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:23,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906675992] [2021-11-23 17:35:23,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:23,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:23,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:23,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:23,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:23,177 INFO L87 Difference]: Start difference. First operand 849 states and 1199 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:23,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:23,302 INFO L93 Difference]: Finished difference Result 2093 states and 2985 transitions. [2021-11-23 17:35:23,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:23,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-23 17:35:23,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:23,313 INFO L225 Difference]: With dead ends: 2093 [2021-11-23 17:35:23,314 INFO L226 Difference]: Without dead ends: 1371 [2021-11-23 17:35:23,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 77 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 17:35:23,320 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 73 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:23,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 253 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:35:23,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1371 states. [2021-11-23 17:35:23,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1371 to 1369. [2021-11-23 17:35:23,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1369 states, 1368 states have (on average 1.3940058479532165) internal successors, (1907), 1368 states have internal predecessors, (1907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:23,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1369 states to 1369 states and 1907 transitions. [2021-11-23 17:35:23,456 INFO L78 Accepts]: Start accepts. Automaton has 1369 states and 1907 transitions. Word has length 79 [2021-11-23 17:35:23,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:23,457 INFO L470 AbstractCegarLoop]: Abstraction has 1369 states and 1907 transitions. [2021-11-23 17:35:23,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:23,457 INFO L276 IsEmpty]: Start isEmpty. Operand 1369 states and 1907 transitions. [2021-11-23 17:35:23,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:35:23,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:23,460 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:23,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:23,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:23,674 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:23,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:23,675 INFO L85 PathProgramCache]: Analyzing trace with hash -1797910053, now seen corresponding path program 1 times [2021-11-23 17:35:23,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:23,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1527784644] [2021-11-23 17:35:23,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:23,676 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:23,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:23,676 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:23,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:35:23,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:23,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:23,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:24,015 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:24,015 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:24,016 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:24,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1527784644] [2021-11-23 17:35:24,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1527784644] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:24,016 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:24,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:24,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976628959] [2021-11-23 17:35:24,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:24,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:24,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:24,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:24,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:24,018 INFO L87 Difference]: Start difference. First operand 1369 states and 1907 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 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 17:35:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:24,154 INFO L93 Difference]: Finished difference Result 2613 states and 3673 transitions. [2021-11-23 17:35:24,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:24,155 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 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 99 [2021-11-23 17:35:24,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:24,164 INFO L225 Difference]: With dead ends: 2613 [2021-11-23 17:35:24,165 INFO L226 Difference]: Without dead ends: 1371 [2021-11-23 17:35:24,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 97 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 17:35:24,168 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 59 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:24,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 239 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:35:24,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1371 states. [2021-11-23 17:35:24,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1371 to 1369. [2021-11-23 17:35:24,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1369 states, 1368 states have (on average 1.3793859649122806) internal successors, (1887), 1368 states have internal predecessors, (1887), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:24,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1369 states to 1369 states and 1887 transitions. [2021-11-23 17:35:24,291 INFO L78 Accepts]: Start accepts. Automaton has 1369 states and 1887 transitions. Word has length 99 [2021-11-23 17:35:24,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:24,292 INFO L470 AbstractCegarLoop]: Abstraction has 1369 states and 1887 transitions. [2021-11-23 17:35:24,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 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 17:35:24,293 INFO L276 IsEmpty]: Start isEmpty. Operand 1369 states and 1887 transitions. [2021-11-23 17:35:24,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:35:24,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:24,295 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:24,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:24,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:24,510 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:24,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:24,510 INFO L85 PathProgramCache]: Analyzing trace with hash 196495434, now seen corresponding path program 1 times [2021-11-23 17:35:24,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:24,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004465104] [2021-11-23 17:35:24,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:24,511 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:24,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:24,513 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:24,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:35:24,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:24,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:35:24,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:25,093 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:35:25,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:25,094 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:25,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004465104] [2021-11-23 17:35:25,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2004465104] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:25,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:25,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:35:25,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800358687] [2021-11-23 17:35:25,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:25,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:35:25,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:25,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:35:25,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:25,097 INFO L87 Difference]: Start difference. First operand 1369 states and 1887 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 17:35:25,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:25,234 INFO L93 Difference]: Finished difference Result 2617 states and 3639 transitions. [2021-11-23 17:35:25,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:35:25,234 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 100 [2021-11-23 17:35:25,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:25,244 INFO L225 Difference]: With dead ends: 2617 [2021-11-23 17:35:25,244 INFO L226 Difference]: Without dead ends: 1375 [2021-11-23 17:35:25,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:35:25,247 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 15 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:25,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 291 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 17:35:25,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1375 states. [2021-11-23 17:35:25,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1375 to 1375. [2021-11-23 17:35:25,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1375 states, 1374 states have (on average 1.3777292576419213) internal successors, (1893), 1374 states have internal predecessors, (1893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:25,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1375 states to 1375 states and 1893 transitions. [2021-11-23 17:35:25,385 INFO L78 Accepts]: Start accepts. Automaton has 1375 states and 1893 transitions. Word has length 100 [2021-11-23 17:35:25,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:25,385 INFO L470 AbstractCegarLoop]: Abstraction has 1375 states and 1893 transitions. [2021-11-23 17:35:25,386 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 17:35:25,386 INFO L276 IsEmpty]: Start isEmpty. Operand 1375 states and 1893 transitions. [2021-11-23 17:35:25,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:35:25,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:25,388 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:25,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:25,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:25,602 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:25,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:25,602 INFO L85 PathProgramCache]: Analyzing trace with hash -1124551470, now seen corresponding path program 1 times [2021-11-23 17:35:25,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:25,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1900470410] [2021-11-23 17:35:25,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:25,603 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:25,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:25,604 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:25,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:35:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:25,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:25,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:27,751 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:27,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:28,450 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:28,451 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:28,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1900470410] [2021-11-23 17:35:28,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1900470410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:28,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1719430230] [2021-11-23 17:35:28,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:28,452 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:28,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:28,459 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:28,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:35:28,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:28,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:28,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:30,389 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:30,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:30,872 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:30,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1719430230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:30,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910284947] [2021-11-23 17:35:30,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:30,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:30,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:30,875 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:30,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 17:35:30,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:30,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:30,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:32,634 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:32,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:33,570 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:33,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910284947] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:33,570 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:33,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:35:33,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796741913] [2021-11-23 17:35:33,571 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:33,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:35:33,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:33,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:35:33,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:35:33,574 INFO L87 Difference]: Start difference. First operand 1375 states and 1893 transitions. Second operand has 34 states, 34 states have (on average 8.970588235294118) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:34,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:34,443 INFO L93 Difference]: Finished difference Result 2632 states and 3655 transitions. [2021-11-23 17:35:34,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:35:34,445 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 8.970588235294118) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 100 [2021-11-23 17:35:34,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:34,455 INFO L225 Difference]: With dead ends: 2632 [2021-11-23 17:35:34,455 INFO L226 Difference]: Without dead ends: 1390 [2021-11-23 17:35:34,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 607 GetRequests, 565 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:35:34,460 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 116 mSDsluCounter, 1130 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 1213 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:34,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 1213 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 112 Invalid, 0 Unknown, 131 Unchecked, 0.1s Time] [2021-11-23 17:35:34,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2021-11-23 17:35:34,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 1390. [2021-11-23 17:35:34,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1390 states, 1389 states have (on average 1.3743700503959684) internal successors, (1909), 1389 states have internal predecessors, (1909), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:34,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1390 states to 1390 states and 1909 transitions. [2021-11-23 17:35:34,619 INFO L78 Accepts]: Start accepts. Automaton has 1390 states and 1909 transitions. Word has length 100 [2021-11-23 17:35:34,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:34,620 INFO L470 AbstractCegarLoop]: Abstraction has 1390 states and 1909 transitions. [2021-11-23 17:35:34,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 8.970588235294118) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:34,621 INFO L276 IsEmpty]: Start isEmpty. Operand 1390 states and 1909 transitions. [2021-11-23 17:35:34,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:35:34,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:34,624 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:34,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:34,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:35,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:35,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:35,227 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:35,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:35,227 INFO L85 PathProgramCache]: Analyzing trace with hash 996070834, now seen corresponding path program 1 times [2021-11-23 17:35:35,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:35,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1240257844] [2021-11-23 17:35:35,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:35,228 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:35,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:35,229 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:35,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:35:35,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:35,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:35,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:36,758 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:35:36,759 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:36,759 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:36,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1240257844] [2021-11-23 17:35:36,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1240257844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:36,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:36,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 17:35:36,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920768878] [2021-11-23 17:35:36,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:36,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 17:35:36,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:36,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 17:35:36,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:35:36,762 INFO L87 Difference]: Start difference. First operand 1390 states and 1909 transitions. Second operand has 10 states, 10 states have (on average 9.5) internal successors, (95), 9 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:36,922 INFO L93 Difference]: Finished difference Result 2707 states and 3739 transitions. [2021-11-23 17:35:36,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:35:36,923 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 9.5) internal successors, (95), 9 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 100 [2021-11-23 17:35:36,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:36,933 INFO L225 Difference]: With dead ends: 2707 [2021-11-23 17:35:36,933 INFO L226 Difference]: Without dead ends: 1446 [2021-11-23 17:35:36,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:35:36,937 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 50 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:36,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 427 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 92 Unchecked, 0.0s Time] [2021-11-23 17:35:36,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2021-11-23 17:35:37,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1446. [2021-11-23 17:35:37,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1446 states, 1445 states have (on average 1.3640138408304499) internal successors, (1971), 1445 states have internal predecessors, (1971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:37,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1446 states to 1446 states and 1971 transitions. [2021-11-23 17:35:37,084 INFO L78 Accepts]: Start accepts. Automaton has 1446 states and 1971 transitions. Word has length 100 [2021-11-23 17:35:37,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:37,085 INFO L470 AbstractCegarLoop]: Abstraction has 1446 states and 1971 transitions. [2021-11-23 17:35:37,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 9.5) internal successors, (95), 9 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:37,085 INFO L276 IsEmpty]: Start isEmpty. Operand 1446 states and 1971 transitions. [2021-11-23 17:35:37,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:37,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:37,088 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:37,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:37,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:37,306 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:37,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:37,307 INFO L85 PathProgramCache]: Analyzing trace with hash 2106899431, now seen corresponding path program 1 times [2021-11-23 17:35:37,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:37,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1396699932] [2021-11-23 17:35:37,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:37,307 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:37,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:37,308 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:37,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:35:37,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:37,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:37,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:38,049 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:35:38,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:38,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:38,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1396699932] [2021-11-23 17:35:38,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1396699932] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:38,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:38,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:35:38,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875470539] [2021-11-23 17:35:38,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:38,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:35:38,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:38,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:35:38,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:35:38,053 INFO L87 Difference]: Start difference. First operand 1446 states and 1971 transitions. Second operand has 5 states, 5 states have (on average 19.2) internal successors, (96), 4 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:38,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:38,219 INFO L93 Difference]: Finished difference Result 2711 states and 3742 transitions. [2021-11-23 17:35:38,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:35:38,219 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.2) internal successors, (96), 4 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:35:38,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:38,228 INFO L225 Difference]: With dead ends: 2711 [2021-11-23 17:35:38,228 INFO L226 Difference]: Without dead ends: 1450 [2021-11-23 17:35:38,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:35:38,231 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 107 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:38,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 221 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 0 Unknown, 65 Unchecked, 0.1s Time] [2021-11-23 17:35:38,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1450 states. [2021-11-23 17:35:38,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1450 to 1394. [2021-11-23 17:35:38,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1393 states have (on average 1.3725771715721464) internal successors, (1912), 1393 states have internal predecessors, (1912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:38,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 1912 transitions. [2021-11-23 17:35:38,368 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 1912 transitions. Word has length 101 [2021-11-23 17:35:38,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:38,369 INFO L470 AbstractCegarLoop]: Abstraction has 1394 states and 1912 transitions. [2021-11-23 17:35:38,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.2) internal successors, (96), 4 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:38,369 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 1912 transitions. [2021-11-23 17:35:38,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:38,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:38,372 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:38,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:38,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:38,586 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:38,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:38,586 INFO L85 PathProgramCache]: Analyzing trace with hash 1525952226, now seen corresponding path program 1 times [2021-11-23 17:35:38,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:38,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1443487494] [2021-11-23 17:35:38,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:38,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:38,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:38,589 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:38,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:35:38,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:38,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:38,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:38,877 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:35:38,878 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:38,878 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:38,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1443487494] [2021-11-23 17:35:38,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1443487494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:38,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:38,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:38,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139101929] [2021-11-23 17:35:38,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:38,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:38,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:38,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:38,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:38,880 INFO L87 Difference]: Start difference. First operand 1394 states and 1912 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 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 17:35:39,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:39,037 INFO L93 Difference]: Finished difference Result 2649 states and 3670 transitions. [2021-11-23 17:35:39,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:39,038 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 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 101 [2021-11-23 17:35:39,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:39,046 INFO L225 Difference]: With dead ends: 2649 [2021-11-23 17:35:39,046 INFO L226 Difference]: Without dead ends: 1394 [2021-11-23 17:35:39,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 99 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 17:35:39,050 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 85 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:39,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 100 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:35:39,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1394 states. [2021-11-23 17:35:39,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1394 to 1394. [2021-11-23 17:35:39,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1393 states have (on average 1.35678391959799) internal successors, (1890), 1393 states have internal predecessors, (1890), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:39,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 1890 transitions. [2021-11-23 17:35:39,187 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 1890 transitions. Word has length 101 [2021-11-23 17:35:39,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:39,187 INFO L470 AbstractCegarLoop]: Abstraction has 1394 states and 1890 transitions. [2021-11-23 17:35:39,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 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 17:35:39,188 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 1890 transitions. [2021-11-23 17:35:39,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:39,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:39,190 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:39,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:39,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:39,404 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:39,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:39,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1274262283, now seen corresponding path program 1 times [2021-11-23 17:35:39,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:39,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1674384186] [2021-11-23 17:35:39,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:39,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:39,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:39,407 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:39,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:35:39,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:39,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:35:39,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:41,691 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:41,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:42,467 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:42,467 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:42,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1674384186] [2021-11-23 17:35:42,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1674384186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:42,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [549893438] [2021-11-23 17:35:42,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:42,469 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:42,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:42,479 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:42,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:35:42,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:42,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:35:42,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:44,223 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:44,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:44,683 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:44,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [549893438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:44,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772557456] [2021-11-23 17:35:44,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:44,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:44,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:44,684 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:44,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:35:44,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:44,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:44,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:46,530 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:46,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:47,214 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:47,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772557456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:47,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:47,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 8, 8] total 31 [2021-11-23 17:35:47,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761900085] [2021-11-23 17:35:47,215 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:47,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:35:47,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:47,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:35:47,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=859, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:35:47,218 INFO L87 Difference]: Start difference. First operand 1394 states and 1890 transitions. Second operand has 32 states, 32 states have (on average 9.75) internal successors, (312), 31 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:47,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:47,967 INFO L93 Difference]: Finished difference Result 2705 states and 3698 transitions. [2021-11-23 17:35:47,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:35:47,968 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 9.75) internal successors, (312), 31 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:35:47,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:47,975 INFO L225 Difference]: With dead ends: 2705 [2021-11-23 17:35:47,975 INFO L226 Difference]: Without dead ends: 1463 [2021-11-23 17:35:47,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 572 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=253, Invalid=1469, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:35:47,979 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 129 mSDsluCounter, 1180 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 1267 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 211 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:47,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 1267 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 111 Invalid, 0 Unknown, 211 Unchecked, 0.1s Time] [2021-11-23 17:35:47,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1463 states. [2021-11-23 17:35:48,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1463 to 1455. [2021-11-23 17:35:48,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1455 states, 1454 states have (on average 1.3486932599724897) internal successors, (1961), 1454 states have internal predecessors, (1961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:48,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1455 states to 1455 states and 1961 transitions. [2021-11-23 17:35:48,173 INFO L78 Accepts]: Start accepts. Automaton has 1455 states and 1961 transitions. Word has length 101 [2021-11-23 17:35:48,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:48,174 INFO L470 AbstractCegarLoop]: Abstraction has 1455 states and 1961 transitions. [2021-11-23 17:35:48,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 9.75) internal successors, (312), 31 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:48,174 INFO L276 IsEmpty]: Start isEmpty. Operand 1455 states and 1961 transitions. [2021-11-23 17:35:48,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:48,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:48,177 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:48,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:48,394 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-23 17:35:48,619 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 17:35:48,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:48,793 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:48,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:48,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1290311859, now seen corresponding path program 1 times [2021-11-23 17:35:48,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:48,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1944730003] [2021-11-23 17:35:48,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:48,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:48,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:48,795 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:48,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:35:48,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:48,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:48,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:51,063 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:51,603 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:51,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1944730003] [2021-11-23 17:35:51,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1944730003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:51,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1736062599] [2021-11-23 17:35:51,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:51,604 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:51,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:51,605 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:51,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 17:35:51,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:51,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:51,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:53,671 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:53,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:53,956 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:53,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1736062599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:53,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89922545] [2021-11-23 17:35:53,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:53,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:53,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:53,958 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:53,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 17:35:54,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:54,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:54,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:55,762 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:55,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:56,374 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:56,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89922545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:56,374 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:56,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:35:56,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515111430] [2021-11-23 17:35:56,375 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:56,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:35:56,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:56,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:35:56,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:35:56,378 INFO L87 Difference]: Start difference. First operand 1455 states and 1961 transitions. Second operand has 34 states, 34 states have (on average 9.705882352941176) internal successors, (330), 33 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:57,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:57,017 INFO L93 Difference]: Finished difference Result 2913 states and 3946 transitions. [2021-11-23 17:35:57,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:35:57,018 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.705882352941176) internal successors, (330), 33 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:35:57,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:57,025 INFO L225 Difference]: With dead ends: 2913 [2021-11-23 17:35:57,026 INFO L226 Difference]: Without dead ends: 1671 [2021-11-23 17:35:57,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 571 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:35:57,029 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 150 mSDsluCounter, 1323 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 187 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:57,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 1410 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 187 Unchecked, 0.1s Time] [2021-11-23 17:35:57,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1671 states. [2021-11-23 17:35:57,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1671 to 1641. [2021-11-23 17:35:57,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1641 states, 1640 states have (on average 1.3298780487804878) internal successors, (2181), 1640 states have internal predecessors, (2181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:57,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1641 states to 1641 states and 2181 transitions. [2021-11-23 17:35:57,209 INFO L78 Accepts]: Start accepts. Automaton has 1641 states and 2181 transitions. Word has length 101 [2021-11-23 17:35:57,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:57,210 INFO L470 AbstractCegarLoop]: Abstraction has 1641 states and 2181 transitions. [2021-11-23 17:35:57,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.705882352941176) internal successors, (330), 33 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:57,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1641 states and 2181 transitions. [2021-11-23 17:35:57,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:57,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:57,214 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:57,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:57,443 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 17:35:57,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:57,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:57,817 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:57,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:57,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1220971094, now seen corresponding path program 1 times [2021-11-23 17:35:57,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:57,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [330790872] [2021-11-23 17:35:57,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:57,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:57,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:57,819 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:57,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:35:57,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:57,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:57,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:58,150 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:35:58,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:58,151 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:58,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [330790872] [2021-11-23 17:35:58,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [330790872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:58,151 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:58,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:58,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966202315] [2021-11-23 17:35:58,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:58,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:58,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:58,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:58,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:58,156 INFO L87 Difference]: Start difference. First operand 1641 states and 2181 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:58,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:58,373 INFO L93 Difference]: Finished difference Result 2902 states and 3926 transitions. [2021-11-23 17:35:58,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:58,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:35:58,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:58,381 INFO L225 Difference]: With dead ends: 2902 [2021-11-23 17:35:58,381 INFO L226 Difference]: Without dead ends: 1641 [2021-11-23 17:35:58,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 99 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 17:35:58,383 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 85 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:58,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 119 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:35:58,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1641 states. [2021-11-23 17:35:58,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1641 to 1641. [2021-11-23 17:35:58,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1641 states, 1640 states have (on average 1.3128048780487804) internal successors, (2153), 1640 states have internal predecessors, (2153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:58,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1641 states to 1641 states and 2153 transitions. [2021-11-23 17:35:58,534 INFO L78 Accepts]: Start accepts. Automaton has 1641 states and 2153 transitions. Word has length 101 [2021-11-23 17:35:58,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:58,535 INFO L470 AbstractCegarLoop]: Abstraction has 1641 states and 2153 transitions. [2021-11-23 17:35:58,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:58,535 INFO L276 IsEmpty]: Start isEmpty. Operand 1641 states and 2153 transitions. [2021-11-23 17:35:58,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:58,537 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:58,538 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:58,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:58,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:58,751 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:58,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:58,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1707682161, now seen corresponding path program 1 times [2021-11-23 17:35:58,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:58,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1036801381] [2021-11-23 17:35:58,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:58,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:58,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:58,754 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:58,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:35:58,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:58,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:58,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:59,027 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:35:59,027 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:59,028 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:59,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1036801381] [2021-11-23 17:35:59,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1036801381] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:59,028 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:59,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:35:59,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980107924] [2021-11-23 17:35:59,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:59,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:59,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:59,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:59,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:59,030 INFO L87 Difference]: Start difference. First operand 1641 states and 2153 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:59,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:59,239 INFO L93 Difference]: Finished difference Result 2908 states and 3885 transitions. [2021-11-23 17:35:59,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:59,240 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:35:59,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:59,250 INFO L225 Difference]: With dead ends: 2908 [2021-11-23 17:35:59,251 INFO L226 Difference]: Without dead ends: 1641 [2021-11-23 17:35:59,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 99 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 17:35:59,254 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 85 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:59,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 138 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:35:59,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1641 states. [2021-11-23 17:35:59,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1641 to 1641. [2021-11-23 17:35:59,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1641 states, 1640 states have (on average 1.295731707317073) internal successors, (2125), 1640 states have internal predecessors, (2125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:59,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1641 states to 1641 states and 2125 transitions. [2021-11-23 17:35:59,425 INFO L78 Accepts]: Start accepts. Automaton has 1641 states and 2125 transitions. Word has length 101 [2021-11-23 17:35:59,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:59,425 INFO L470 AbstractCegarLoop]: Abstraction has 1641 states and 2125 transitions. [2021-11-23 17:35:59,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:59,426 INFO L276 IsEmpty]: Start isEmpty. Operand 1641 states and 2125 transitions. [2021-11-23 17:35:59,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:35:59,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:59,428 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:35:59,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:59,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:59,643 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:59,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:59,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1582433922, now seen corresponding path program 1 times [2021-11-23 17:35:59,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:59,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [187619101] [2021-11-23 17:35:59,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:59,644 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:59,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:59,645 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:59,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:35:59,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:59,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:35:59,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:00,296 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:36:00,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:00,296 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:00,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [187619101] [2021-11-23 17:36:00,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [187619101] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:00,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:36:00,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:36:00,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846659595] [2021-11-23 17:36:00,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:00,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:36:00,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:00,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:36:00,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:36:00,298 INFO L87 Difference]: Start difference. First operand 1641 states and 2125 transitions. Second operand has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:00,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:00,417 INFO L93 Difference]: Finished difference Result 2902 states and 3830 transitions. [2021-11-23 17:36:00,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:36:00,417 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 101 [2021-11-23 17:36:00,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:00,427 INFO L225 Difference]: With dead ends: 2902 [2021-11-23 17:36:00,427 INFO L226 Difference]: Without dead ends: 1635 [2021-11-23 17:36:00,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:36:00,431 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 46 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:00,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 250 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 59 Unchecked, 0.0s Time] [2021-11-23 17:36:00,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1635 states. [2021-11-23 17:36:00,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1635 to 1635. [2021-11-23 17:36:00,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1635 states, 1634 states have (on average 1.2937576499388004) internal successors, (2114), 1634 states have internal predecessors, (2114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:00,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1635 states to 1635 states and 2114 transitions. [2021-11-23 17:36:00,609 INFO L78 Accepts]: Start accepts. Automaton has 1635 states and 2114 transitions. Word has length 101 [2021-11-23 17:36:00,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:00,610 INFO L470 AbstractCegarLoop]: Abstraction has 1635 states and 2114 transitions. [2021-11-23 17:36:00,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:00,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1635 states and 2114 transitions. [2021-11-23 17:36:00,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:36:00,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:00,614 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:00,631 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 17:36:00,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:00,828 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:00,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:00,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1214363720, now seen corresponding path program 1 times [2021-11-23 17:36:00,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:00,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1565499047] [2021-11-23 17:36:00,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:00,830 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:00,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:00,831 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:00,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:36:00,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:00,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:00,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:02,522 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:02,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:03,008 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:03,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:03,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1565499047] [2021-11-23 17:36:03,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1565499047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:03,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [452251631] [2021-11-23 17:36:03,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:03,010 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:03,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:03,012 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:03,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 17:36:03,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:03,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:03,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:04,352 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:04,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:04,697 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:04,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [452251631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:04,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72339321] [2021-11-23 17:36:04,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:04,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:04,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:04,699 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:04,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 17:36:04,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:04,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:04,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:05,994 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:05,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:06,308 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:06,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72339321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:06,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:06,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:36:06,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272600011] [2021-11-23 17:36:06,309 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:06,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:36:06,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:06,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:36:06,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:36:06,311 INFO L87 Difference]: Start difference. First operand 1635 states and 2114 transitions. Second operand has 16 states, 16 states have (on average 12.3125) internal successors, (197), 15 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:07,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:07,598 INFO L93 Difference]: Finished difference Result 5835 states and 7741 transitions. [2021-11-23 17:36:07,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:36:07,599 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.3125) internal successors, (197), 15 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-23 17:36:07,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:07,617 INFO L225 Difference]: With dead ends: 5835 [2021-11-23 17:36:07,617 INFO L226 Difference]: Without dead ends: 4593 [2021-11-23 17:36:07,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 593 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:36:07,622 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 620 mSDsluCounter, 1177 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 620 SdHoareTripleChecker+Valid, 1371 SdHoareTripleChecker+Invalid, 1113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 640 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:07,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [620 Valid, 1371 Invalid, 1113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 451 Invalid, 0 Unknown, 640 Unchecked, 0.4s Time] [2021-11-23 17:36:07,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4593 states. [2021-11-23 17:36:07,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4593 to 2749. [2021-11-23 17:36:07,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2749 states, 2748 states have (on average 1.3238719068413392) internal successors, (3638), 2748 states have internal predecessors, (3638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:07,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2749 states to 2749 states and 3638 transitions. [2021-11-23 17:36:07,931 INFO L78 Accepts]: Start accepts. Automaton has 2749 states and 3638 transitions. Word has length 102 [2021-11-23 17:36:07,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:07,931 INFO L470 AbstractCegarLoop]: Abstraction has 2749 states and 3638 transitions. [2021-11-23 17:36:07,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.3125) internal successors, (197), 15 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:07,932 INFO L276 IsEmpty]: Start isEmpty. Operand 2749 states and 3638 transitions. [2021-11-23 17:36:07,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:36:07,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:07,934 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:07,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:08,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-23 17:36:08,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:08,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:08,537 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:08,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:08,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1197874430, now seen corresponding path program 1 times [2021-11-23 17:36:08,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:08,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [986322027] [2021-11-23 17:36:08,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:08,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:08,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:08,539 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:08,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:36:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:08,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:36:08,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:14,229 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:14,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:16,301 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:16,301 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:16,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [986322027] [2021-11-23 17:36:16,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [986322027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:16,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [822773906] [2021-11-23 17:36:16,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:16,302 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:16,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:16,306 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:16,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:36:16,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:16,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:36:16,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:19,907 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:36:19,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:19,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [822773906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:19,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:36:19,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [24, 19] total 55 [2021-11-23 17:36:19,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107268049] [2021-11-23 17:36:19,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:19,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 17:36:19,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:19,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 17:36:19,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=2677, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:36:19,912 INFO L87 Difference]: Start difference. First operand 2749 states and 3638 transitions. Second operand has 19 states, 19 states have (on average 5.052631578947368) internal successors, (96), 19 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:20,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:20,406 INFO L93 Difference]: Finished difference Result 5339 states and 7110 transitions. [2021-11-23 17:36:20,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:36:20,407 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 5.052631578947368) internal successors, (96), 19 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-23 17:36:20,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:20,416 INFO L225 Difference]: With dead ends: 5339 [2021-11-23 17:36:20,417 INFO L226 Difference]: Without dead ends: 2753 [2021-11-23 17:36:20,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=307, Invalid=2773, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 17:36:20,423 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 35 mSDsluCounter, 803 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 901 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 339 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:20,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 901 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 339 Unchecked, 0.1s Time] [2021-11-23 17:36:20,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2753 states. [2021-11-23 17:36:20,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2753 to 2753. [2021-11-23 17:36:20,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2753 states, 2752 states have (on average 1.3234011627906976) internal successors, (3642), 2752 states have internal predecessors, (3642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:20,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2753 states to 2753 states and 3642 transitions. [2021-11-23 17:36:20,623 INFO L78 Accepts]: Start accepts. Automaton has 2753 states and 3642 transitions. Word has length 102 [2021-11-23 17:36:20,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:20,623 INFO L470 AbstractCegarLoop]: Abstraction has 2753 states and 3642 transitions. [2021-11-23 17:36:20,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 5.052631578947368) internal successors, (96), 19 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:20,624 INFO L276 IsEmpty]: Start isEmpty. Operand 2753 states and 3642 transitions. [2021-11-23 17:36:20,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:36:20,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:20,626 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:20,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:20,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:21,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:21,040 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:21,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:21,041 INFO L85 PathProgramCache]: Analyzing trace with hash 1805834514, now seen corresponding path program 1 times [2021-11-23 17:36:21,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:21,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1310860724] [2021-11-23 17:36:21,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:21,041 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:21,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:21,043 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:21,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:36:21,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:21,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:36:21,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:21,841 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:36:21,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:21,842 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:21,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1310860724] [2021-11-23 17:36:21,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1310860724] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:21,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:36:21,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:36:21,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927736996] [2021-11-23 17:36:21,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:21,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:36:21,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:21,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:36:21,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:36:21,844 INFO L87 Difference]: Start difference. First operand 2753 states and 3642 transitions. Second operand has 5 states, 5 states have (on average 19.8) 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 17:36:22,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:22,080 INFO L93 Difference]: Finished difference Result 5331 states and 7102 transitions. [2021-11-23 17:36:22,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:36:22,081 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.8) 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 102 [2021-11-23 17:36:22,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:22,086 INFO L225 Difference]: With dead ends: 5331 [2021-11-23 17:36:22,086 INFO L226 Difference]: Without dead ends: 2751 [2021-11-23 17:36:22,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:36:22,091 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 100 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:22,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 223 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 60 Unchecked, 0.0s Time] [2021-11-23 17:36:22,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2751 states. [2021-11-23 17:36:22,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2751 to 2751. [2021-11-23 17:36:22,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2751 states, 2750 states have (on average 1.3229090909090908) internal successors, (3638), 2750 states have internal predecessors, (3638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:22,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2751 states to 2751 states and 3638 transitions. [2021-11-23 17:36:22,313 INFO L78 Accepts]: Start accepts. Automaton has 2751 states and 3638 transitions. Word has length 102 [2021-11-23 17:36:22,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:22,314 INFO L470 AbstractCegarLoop]: Abstraction has 2751 states and 3638 transitions. [2021-11-23 17:36:22,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.8) 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 17:36:22,314 INFO L276 IsEmpty]: Start isEmpty. Operand 2751 states and 3638 transitions. [2021-11-23 17:36:22,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:36:22,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:22,315 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:22,324 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2021-11-23 17:36:22,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:22,519 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:22,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:22,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1852570867, now seen corresponding path program 1 times [2021-11-23 17:36:22,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:22,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [715469381] [2021-11-23 17:36:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:22,520 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:22,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:22,521 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:22,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:36:22,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:22,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:22,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:23,551 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:23,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:24,030 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:24,031 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:24,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [715469381] [2021-11-23 17:36:24,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [715469381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:24,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [586948834] [2021-11-23 17:36:24,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:24,032 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:24,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:24,035 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:24,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 17:36:24,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:24,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:24,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:25,267 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:25,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:25,723 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:25,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [586948834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:25,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117492232] [2021-11-23 17:36:25,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:25,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:25,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:25,725 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:25,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 17:36:25,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:25,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:25,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:26,698 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:26,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:27,158 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:27,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117492232] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:27,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:27,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:36:27,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323338002] [2021-11-23 17:36:27,159 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:27,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:36:27,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:27,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:36:27,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:36:27,162 INFO L87 Difference]: Start difference. First operand 2751 states and 3638 transitions. Second operand has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:28,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:28,036 INFO L93 Difference]: Finished difference Result 9309 states and 12424 transitions. [2021-11-23 17:36:28,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:36:28,037 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-23 17:36:28,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:28,052 INFO L225 Difference]: With dead ends: 9309 [2021-11-23 17:36:28,053 INFO L226 Difference]: Without dead ends: 6763 [2021-11-23 17:36:28,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 593 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2021-11-23 17:36:28,059 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 296 mSDsluCounter, 805 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 928 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 151 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:28,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 928 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 116 Invalid, 0 Unknown, 151 Unchecked, 0.1s Time] [2021-11-23 17:36:28,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6763 states. [2021-11-23 17:36:28,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6763 to 5143. [2021-11-23 17:36:28,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5143 states, 5142 states have (on average 1.3315830416180474) internal successors, (6847), 5142 states have internal predecessors, (6847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:28,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5143 states to 5143 states and 6847 transitions. [2021-11-23 17:36:28,660 INFO L78 Accepts]: Start accepts. Automaton has 5143 states and 6847 transitions. Word has length 102 [2021-11-23 17:36:28,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:28,660 INFO L470 AbstractCegarLoop]: Abstraction has 5143 states and 6847 transitions. [2021-11-23 17:36:28,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.5625) internal successors, (185), 15 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:28,661 INFO L276 IsEmpty]: Start isEmpty. Operand 5143 states and 6847 transitions. [2021-11-23 17:36:28,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:36:28,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:28,663 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:28,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Ended with exit code 0 [2021-11-23 17:36:28,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:29,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-23 17:36:29,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:29,267 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:29,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:29,267 INFO L85 PathProgramCache]: Analyzing trace with hash 3259025, now seen corresponding path program 1 times [2021-11-23 17:36:29,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:29,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1748893479] [2021-11-23 17:36:29,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:29,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:29,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:29,269 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:29,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:36:29,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:29,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:29,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:30,687 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:30,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:31,082 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:31,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:31,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1748893479] [2021-11-23 17:36:31,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1748893479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:31,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [812389841] [2021-11-23 17:36:31,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:31,083 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:31,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:31,084 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:31,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:36:31,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:31,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:31,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:32,522 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:32,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:32,833 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:32,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [812389841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:32,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699475399] [2021-11-23 17:36:32,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:32,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:32,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:32,834 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:32,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:36:32,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:32,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:36:32,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:34,117 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:34,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:34,410 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:34,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699475399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:34,411 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:34,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:36:34,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013798731] [2021-11-23 17:36:34,411 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:34,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:36:34,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:34,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:36:34,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:36:34,413 INFO L87 Difference]: Start difference. First operand 5143 states and 6847 transitions. Second operand has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:37,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:37,106 INFO L93 Difference]: Finished difference Result 22470 states and 29711 transitions. [2021-11-23 17:36:37,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:36:37,107 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-23 17:36:37,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:37,150 INFO L225 Difference]: With dead ends: 22470 [2021-11-23 17:36:37,151 INFO L226 Difference]: Without dead ends: 17468 [2021-11-23 17:36:37,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 594 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=316, Invalid=1576, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:37,163 INFO L933 BasicCegarLoop]: 258 mSDtfsCounter, 682 mSDsluCounter, 1431 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 682 SdHoareTripleChecker+Valid, 1689 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 490 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:37,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [682 Valid, 1689 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 446 Invalid, 0 Unknown, 490 Unchecked, 0.4s Time] [2021-11-23 17:36:37,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17468 states. [2021-11-23 17:36:38,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17468 to 10213. [2021-11-23 17:36:38,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10213 states, 10212 states have (on average 1.3305914610262437) internal successors, (13588), 10212 states have internal predecessors, (13588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:38,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10213 states to 10213 states and 13588 transitions. [2021-11-23 17:36:38,459 INFO L78 Accepts]: Start accepts. Automaton has 10213 states and 13588 transitions. Word has length 102 [2021-11-23 17:36:38,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:38,459 INFO L470 AbstractCegarLoop]: Abstraction has 10213 states and 13588 transitions. [2021-11-23 17:36:38,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:38,460 INFO L276 IsEmpty]: Start isEmpty. Operand 10213 states and 13588 transitions. [2021-11-23 17:36:38,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:36:38,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:38,463 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:38,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:38,702 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 17:36:38,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 17:36:39,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:39,078 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:39,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:39,078 INFO L85 PathProgramCache]: Analyzing trace with hash -742700557, now seen corresponding path program 1 times [2021-11-23 17:36:39,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:39,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1399409032] [2021-11-23 17:36:39,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:39,079 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:39,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:39,081 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:39,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:36:39,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:39,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:39,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:40,293 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:40,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:40,841 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:40,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:40,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1399409032] [2021-11-23 17:36:40,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1399409032] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:40,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1751246428] [2021-11-23 17:36:40,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:40,842 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:40,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:40,843 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:40,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:36:41,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:41,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:36:41,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:42,152 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:42,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:42,509 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:42,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1751246428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:42,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1521950084] [2021-11-23 17:36:42,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:42,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:42,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:42,511 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:42,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:36:42,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:42,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:36:42,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:46,036 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:46,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:46,853 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:46,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1521950084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:46,854 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:46,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 18, 14] total 44 [2021-11-23 17:36:46,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186661743] [2021-11-23 17:36:46,855 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:46,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 17:36:46,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:46,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 17:36:46,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1700, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:46,858 INFO L87 Difference]: Start difference. First operand 10213 states and 13588 transitions. Second operand has 44 states, 44 states have (on average 6.863636363636363) internal successors, (302), 44 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:49,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:49,107 INFO L93 Difference]: Finished difference Result 20788 states and 27564 transitions. [2021-11-23 17:36:49,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:36:49,108 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 6.863636363636363) internal successors, (302), 44 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:36:49,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:49,132 INFO L225 Difference]: With dead ends: 20788 [2021-11-23 17:36:49,132 INFO L226 Difference]: Without dead ends: 10666 [2021-11-23 17:36:49,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 578 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=316, Invalid=2876, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:36:49,148 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 182 mSDsluCounter, 2057 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 2166 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 235 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:49,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 2166 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 179 Invalid, 0 Unknown, 235 Unchecked, 0.2s Time] [2021-11-23 17:36:49,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10666 states. [2021-11-23 17:36:50,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10666 to 10317. [2021-11-23 17:36:50,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10317 states, 10316 states have (on average 1.3292943001163242) internal successors, (13713), 10316 states have internal predecessors, (13713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:50,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10317 states to 10317 states and 13713 transitions. [2021-11-23 17:36:50,469 INFO L78 Accepts]: Start accepts. Automaton has 10317 states and 13713 transitions. Word has length 103 [2021-11-23 17:36:50,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:50,470 INFO L470 AbstractCegarLoop]: Abstraction has 10317 states and 13713 transitions. [2021-11-23 17:36:50,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 6.863636363636363) internal successors, (302), 44 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:50,470 INFO L276 IsEmpty]: Start isEmpty. Operand 10317 states and 13713 transitions. [2021-11-23 17:36:50,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:36:50,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:50,474 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:50,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:50,712 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 17:36:50,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:51,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:51,088 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:51,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:51,089 INFO L85 PathProgramCache]: Analyzing trace with hash -2013312071, now seen corresponding path program 1 times [2021-11-23 17:36:51,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:51,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1852762983] [2021-11-23 17:36:51,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:51,089 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:51,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:51,090 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:51,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:36:51,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:51,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:36:51,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:51,402 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:51,402 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:51,402 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:51,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1852762983] [2021-11-23 17:36:51,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1852762983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:51,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:36:51,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:36:51,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122315071] [2021-11-23 17:36:51,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:51,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:36:51,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:51,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:36:51,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:36:51,408 INFO L87 Difference]: Start difference. First operand 10317 states and 13713 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:52,040 INFO L93 Difference]: Finished difference Result 15361 states and 20411 transitions. [2021-11-23 17:36:52,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:36:52,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:36:52,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:52,049 INFO L225 Difference]: With dead ends: 15361 [2021-11-23 17:36:52,049 INFO L226 Difference]: Without dead ends: 5239 [2021-11-23 17:36:52,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 101 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 17:36:52,063 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 51 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:52,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 214 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:36:52,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5239 states. [2021-11-23 17:36:52,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5239 to 5237. [2021-11-23 17:36:52,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5237 states, 5236 states have (on average 1.296409472880061) internal successors, (6788), 5236 states have internal predecessors, (6788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5237 states to 5237 states and 6788 transitions. [2021-11-23 17:36:52,622 INFO L78 Accepts]: Start accepts. Automaton has 5237 states and 6788 transitions. Word has length 103 [2021-11-23 17:36:52,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:52,623 INFO L470 AbstractCegarLoop]: Abstraction has 5237 states and 6788 transitions. [2021-11-23 17:36:52,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,624 INFO L276 IsEmpty]: Start isEmpty. Operand 5237 states and 6788 transitions. [2021-11-23 17:36:52,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:36:52,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:52,626 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:36:52,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:52,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:52,842 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:52,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:52,842 INFO L85 PathProgramCache]: Analyzing trace with hash 313322809, now seen corresponding path program 1 times [2021-11-23 17:36:52,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:52,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1478249785] [2021-11-23 17:36:52,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:52,843 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:52,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:52,844 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:52,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:36:52,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:52,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:36:52,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:58,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:58,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:01,900 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:01,900 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:01,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1478249785] [2021-11-23 17:37:01,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1478249785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:01,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1397227366] [2021-11-23 17:37:01,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:01,901 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:01,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:01,902 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:01,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:37:02,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:02,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:37:02,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:05,718 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:05,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:08,338 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:08,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1397227366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:08,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142650095] [2021-11-23 17:37:08,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:08,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:08,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:08,339 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:08,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:37:08,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:08,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:37:08,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:14,650 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:14,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:18,717 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:18,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142650095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:18,718 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:18,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 18, 17, 23, 23] total 121 [2021-11-23 17:37:18,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942223014] [2021-11-23 17:37:18,719 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:18,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-23 17:37:18,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:18,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-23 17:37:18,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=13091, Unknown=0, NotChecked=0, Total=14520 [2021-11-23 17:37:18,728 INFO L87 Difference]: Start difference. First operand 5237 states and 6788 transitions. Second operand has 121 states, 121 states have (on average 4.322314049586777) internal successors, (523), 121 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:24,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:24,608 INFO L93 Difference]: Finished difference Result 8222 states and 10619 transitions. [2021-11-23 17:37:24,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 17:37:24,608 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 4.322314049586777) internal successors, (523), 121 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:37:24,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:24,616 INFO L225 Difference]: With dead ends: 8222 [2021-11-23 17:37:24,616 INFO L226 Difference]: Without dead ends: 6183 [2021-11-23 17:37:24,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 499 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7380 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=2122, Invalid=17338, Unknown=0, NotChecked=0, Total=19460 [2021-11-23 17:37:24,626 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 877 mSDsluCounter, 3683 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 877 SdHoareTripleChecker+Valid, 3771 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 331 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:24,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [877 Valid, 3771 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1010 Invalid, 0 Unknown, 331 Unchecked, 1.2s Time] [2021-11-23 17:37:24,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6183 states. [2021-11-23 17:37:25,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6183 to 5216. [2021-11-23 17:37:25,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5216 states, 5215 states have (on average 1.2968360498561842) internal successors, (6763), 5215 states have internal predecessors, (6763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:25,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5216 states to 5216 states and 6763 transitions. [2021-11-23 17:37:25,126 INFO L78 Accepts]: Start accepts. Automaton has 5216 states and 6763 transitions. Word has length 103 [2021-11-23 17:37:25,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:25,126 INFO L470 AbstractCegarLoop]: Abstraction has 5216 states and 6763 transitions. [2021-11-23 17:37:25,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 4.322314049586777) internal successors, (523), 121 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:25,127 INFO L276 IsEmpty]: Start isEmpty. Operand 5216 states and 6763 transitions. [2021-11-23 17:37:25,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:37:25,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:25,129 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:37:25,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:25,340 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 17:37:25,557 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:37:25,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:25,732 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:25,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:25,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1014819790, now seen corresponding path program 1 times [2021-11-23 17:37:25,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:25,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2022610605] [2021-11-23 17:37:25,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:25,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:25,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:25,734 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:25,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:37:25,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:25,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:37:25,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:30,769 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:30,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:32,735 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:32,736 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:32,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2022610605] [2021-11-23 17:37:32,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2022610605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:32,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [287303416] [2021-11-23 17:37:32,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:32,736 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:32,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:32,738 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:32,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:37:32,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:32,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:37:32,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:39,718 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:39,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:42,217 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:42,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [287303416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:42,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482629907] [2021-11-23 17:37:42,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:42,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:42,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:42,219 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:42,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:37:42,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:42,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:37:42,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:46,090 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:46,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:47,449 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:47,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482629907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:47,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:47,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 27, 23, 17, 16] total 88 [2021-11-23 17:37:47,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185802951] [2021-11-23 17:37:47,450 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:47,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:37:47,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:47,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:37:47,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=710, Invalid=6946, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:37:47,453 INFO L87 Difference]: Start difference. First operand 5216 states and 6763 transitions. Second operand has 88 states, 88 states have (on average 4.454545454545454) internal successors, (392), 88 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:57,020 INFO L93 Difference]: Finished difference Result 25136 states and 32117 transitions. [2021-11-23 17:37:57,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-23 17:37:57,021 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 4.454545454545454) internal successors, (392), 88 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:37:57,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:57,044 INFO L225 Difference]: With dead ends: 25136 [2021-11-23 17:37:57,044 INFO L226 Difference]: Without dead ends: 20094 [2021-11-23 17:37:57,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 527 SyntacticMatches, 4 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4631 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1241, Invalid=12099, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 17:37:57,053 INFO L933 BasicCegarLoop]: 193 mSDtfsCounter, 798 mSDsluCounter, 6306 mSDsCounter, 0 mSdLazyCounter, 2098 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 798 SdHoareTripleChecker+Valid, 6499 SdHoareTripleChecker+Invalid, 3044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 2098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 899 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:57,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [798 Valid, 6499 Invalid, 3044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 2098 Invalid, 0 Unknown, 899 Unchecked, 2.8s Time] [2021-11-23 17:37:57,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20094 states. [2021-11-23 17:37:57,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20094 to 5292. [2021-11-23 17:37:57,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5292 states, 5291 states have (on average 1.294084294084294) internal successors, (6847), 5291 states have internal predecessors, (6847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5292 states to 5292 states and 6847 transitions. [2021-11-23 17:37:57,888 INFO L78 Accepts]: Start accepts. Automaton has 5292 states and 6847 transitions. Word has length 103 [2021-11-23 17:37:57,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:57,889 INFO L470 AbstractCegarLoop]: Abstraction has 5292 states and 6847 transitions. [2021-11-23 17:37:57,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 4.454545454545454) internal successors, (392), 88 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,889 INFO L276 IsEmpty]: Start isEmpty. Operand 5292 states and 6847 transitions. [2021-11-23 17:37:57,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:37:57,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:57,893 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:37:57,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:58,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:58,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:58,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:58,507 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:58,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:58,508 INFO L85 PathProgramCache]: Analyzing trace with hash 520064885, now seen corresponding path program 1 times [2021-11-23 17:37:58,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:58,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1094421978] [2021-11-23 17:37:58,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:58,509 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:58,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:58,509 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:58,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:37:58,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:58,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:37:58,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:59,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:59,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:59,847 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:59,847 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:59,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1094421978] [2021-11-23 17:37:59,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1094421978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:59,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1567684243] [2021-11-23 17:37:59,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:59,848 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:59,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:59,849 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:59,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:38:00,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:00,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:00,786 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:00,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:01,040 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:01,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1567684243] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:01,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114865070] [2021-11-23 17:38:01,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:01,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:01,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:01,044 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:01,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:38:01,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:01,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:38:01,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:01,780 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:01,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:02,040 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:02,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114865070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:02,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:02,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13, 10, 11, 10] total 24 [2021-11-23 17:38:02,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387751513] [2021-11-23 17:38:02,041 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:02,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 17:38:02,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:02,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 17:38:02,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:38:02,043 INFO L87 Difference]: Start difference. First operand 5292 states and 6847 transitions. Second operand has 24 states, 24 states have (on average 9.0) internal successors, (216), 24 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:03,031 INFO L93 Difference]: Finished difference Result 10370 states and 13461 transitions. [2021-11-23 17:38:03,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:38:03,032 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 9.0) internal successors, (216), 24 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:38:03,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:03,039 INFO L225 Difference]: With dead ends: 10370 [2021-11-23 17:38:03,039 INFO L226 Difference]: Without dead ends: 5301 [2021-11-23 17:38:03,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 590 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=638, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:38:03,046 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 145 mSDsluCounter, 2004 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 2145 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:03,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 2145 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 187 Invalid, 0 Unknown, 136 Unchecked, 0.1s Time] [2021-11-23 17:38:03,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5301 states. [2021-11-23 17:38:03,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5301 to 5301. [2021-11-23 17:38:03,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5301 states, 5300 states have (on average 1.2924528301886793) internal successors, (6850), 5300 states have internal predecessors, (6850), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5301 states to 5301 states and 6850 transitions. [2021-11-23 17:38:03,866 INFO L78 Accepts]: Start accepts. Automaton has 5301 states and 6850 transitions. Word has length 103 [2021-11-23 17:38:03,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:03,866 INFO L470 AbstractCegarLoop]: Abstraction has 5301 states and 6850 transitions. [2021-11-23 17:38:03,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 9.0) internal successors, (216), 24 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,867 INFO L276 IsEmpty]: Start isEmpty. Operand 5301 states and 6850 transitions. [2021-11-23 17:38:03,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:38:03,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:03,870 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:38:03,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Ended with exit code 0 [2021-11-23 17:38:04,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:04,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:04,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:04,476 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:04,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:04,477 INFO L85 PathProgramCache]: Analyzing trace with hash -735488204, now seen corresponding path program 1 times [2021-11-23 17:38:04,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:04,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1392981344] [2021-11-23 17:38:04,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:04,477 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:04,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:04,478 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:04,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:38:04,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:04,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:04,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:05,604 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:05,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:06,143 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:06,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:06,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1392981344] [2021-11-23 17:38:06,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1392981344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:06,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2039331779] [2021-11-23 17:38:06,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:06,144 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:06,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:06,145 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:06,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:38:06,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:06,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:38:06,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:07,191 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:07,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:07,630 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:07,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2039331779] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:07,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621170228] [2021-11-23 17:38:07,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:07,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:07,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:07,632 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:07,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:38:07,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:07,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:38:07,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:08,583 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:08,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:08,892 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:08,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621170228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:08,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:08,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 12, 11] total 28 [2021-11-23 17:38:08,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745179543] [2021-11-23 17:38:08,894 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:08,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 17:38:08,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:08,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 17:38:08,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=653, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:38:08,896 INFO L87 Difference]: Start difference. First operand 5301 states and 6850 transitions. Second operand has 28 states, 28 states have (on average 8.214285714285714) internal successors, (230), 28 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:12,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:12,134 INFO L93 Difference]: Finished difference Result 20697 states and 26630 transitions. [2021-11-23 17:38:12,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:38:12,135 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 8.214285714285714) internal successors, (230), 28 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:38:12,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:12,154 INFO L225 Difference]: With dead ends: 20697 [2021-11-23 17:38:12,154 INFO L226 Difference]: Without dead ends: 15655 [2021-11-23 17:38:12,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 591 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=204, Invalid=1356, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:38:12,164 INFO L933 BasicCegarLoop]: 408 mSDtfsCounter, 745 mSDsluCounter, 5238 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 745 SdHoareTripleChecker+Valid, 5646 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 520 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:12,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [745 Valid, 5646 Invalid, 861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 334 Invalid, 0 Unknown, 520 Unchecked, 0.3s Time] [2021-11-23 17:38:12,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15655 states. [2021-11-23 17:38:13,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15655 to 5355. [2021-11-23 17:38:13,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5355 states, 5354 states have (on average 1.2906238326484871) internal successors, (6910), 5354 states have internal predecessors, (6910), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:13,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5355 states to 5355 states and 6910 transitions. [2021-11-23 17:38:13,068 INFO L78 Accepts]: Start accepts. Automaton has 5355 states and 6910 transitions. Word has length 103 [2021-11-23 17:38:13,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:13,068 INFO L470 AbstractCegarLoop]: Abstraction has 5355 states and 6910 transitions. [2021-11-23 17:38:13,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 8.214285714285714) internal successors, (230), 28 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:13,069 INFO L276 IsEmpty]: Start isEmpty. Operand 5355 states and 6910 transitions. [2021-11-23 17:38:13,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 17:38:13,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:13,070 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:38:13,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 17:38:13,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-23 17:38:13,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2021-11-23 17:38:13,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:13,676 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:13,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:13,677 INFO L85 PathProgramCache]: Analyzing trace with hash 799396471, now seen corresponding path program 1 times [2021-11-23 17:38:13,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:13,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1536556756] [2021-11-23 17:38:13,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:13,678 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:13,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:13,679 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:13,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:38:13,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:13,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:38:13,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:17,849 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:17,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:19,857 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:19,857 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:19,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1536556756] [2021-11-23 17:38:19,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1536556756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:19,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1707954135] [2021-11-23 17:38:19,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:19,858 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:19,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:19,858 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:19,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:38:20,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:20,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:38:20,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:26,697 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:26,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:29,011 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:29,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1707954135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:29,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203893929] [2021-11-23 17:38:29,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:29,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:29,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:29,013 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:29,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:38:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:29,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:38:29,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:34,369 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:34,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:36,322 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:36,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203893929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:36,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:36,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 27, 25, 18, 18] total 95 [2021-11-23 17:38:36,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946689406] [2021-11-23 17:38:36,323 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:36,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-23 17:38:36,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:36,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-23 17:38:36,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=8234, Unknown=0, NotChecked=0, Total=8930 [2021-11-23 17:38:36,327 INFO L87 Difference]: Start difference. First operand 5355 states and 6910 transitions. Second operand has 95 states, 95 states have (on average 4.410526315789474) internal successors, (419), 95 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:56,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:56,199 INFO L93 Difference]: Finished difference Result 33597 states and 43170 transitions. [2021-11-23 17:38:56,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-23 17:38:56,200 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 4.410526315789474) internal successors, (419), 95 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-11-23 17:38:56,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:56,243 INFO L225 Difference]: With dead ends: 33597 [2021-11-23 17:38:56,243 INFO L226 Difference]: Without dead ends: 30566 [2021-11-23 17:38:56,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 527 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 9593 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=1778, Invalid=23344, Unknown=0, NotChecked=0, Total=25122 [2021-11-23 17:38:56,253 INFO L933 BasicCegarLoop]: 358 mSDtfsCounter, 2134 mSDsluCounter, 11268 mSDsCounter, 0 mSdLazyCounter, 3830 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2134 SdHoareTripleChecker+Valid, 11626 SdHoareTripleChecker+Invalid, 5457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 3830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1551 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:56,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2134 Valid, 11626 Invalid, 5457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 3830 Invalid, 0 Unknown, 1551 Unchecked, 4.9s Time] [2021-11-23 17:38:56,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30566 states. [2021-11-23 17:38:57,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30566 to 5410. [2021-11-23 17:38:57,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5410 states, 5409 states have (on average 1.28840820854132) internal successors, (6969), 5409 states have internal predecessors, (6969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:57,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5410 states to 5410 states and 6969 transitions. [2021-11-23 17:38:57,616 INFO L78 Accepts]: Start accepts. Automaton has 5410 states and 6969 transitions. Word has length 103 [2021-11-23 17:38:57,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:57,616 INFO L470 AbstractCegarLoop]: Abstraction has 5410 states and 6969 transitions. [2021-11-23 17:38:57,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 4.410526315789474) internal successors, (419), 95 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:57,616 INFO L276 IsEmpty]: Start isEmpty. Operand 5410 states and 6969 transitions. [2021-11-23 17:38:57,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:38:57,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:57,618 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:38:57,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:57,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 17:38:58,027 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:38:58,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:58,219 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:58,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:58,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1676606701, now seen corresponding path program 1 times [2021-11-23 17:38:58,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:58,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1556367438] [2021-11-23 17:38:58,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:58,220 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:58,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:58,221 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:58,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:38:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:58,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:38:58,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:58,825 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:38:58,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:59,086 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:38:59,086 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:59,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1556367438] [2021-11-23 17:38:59,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1556367438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:59,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1563259443] [2021-11-23 17:38:59,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:59,087 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:59,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:59,088 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:59,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:38:59,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:59,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:59,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:59,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:38:59,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:00,131 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:39:00,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1563259443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:00,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346351682] [2021-11-23 17:39:00,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:00,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:00,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:00,133 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:00,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:39:00,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:00,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:39:00,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:00,773 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:39:00,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:01,226 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:39:01,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346351682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:01,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:01,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 6] total 10 [2021-11-23 17:39:01,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090635021] [2021-11-23 17:39:01,227 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:01,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 17:39:01,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:01,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 17:39:01,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:39:01,228 INFO L87 Difference]: Start difference. First operand 5410 states and 6969 transitions. Second operand has 10 states, 10 states have (on average 25.0) internal successors, (250), 10 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:03,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:03,018 INFO L93 Difference]: Finished difference Result 13103 states and 16836 transitions. [2021-11-23 17:39:03,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:39:03,018 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 25.0) internal successors, (250), 10 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:39:03,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:03,028 INFO L225 Difference]: With dead ends: 13103 [2021-11-23 17:39:03,028 INFO L226 Difference]: Without dead ends: 8061 [2021-11-23 17:39:03,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 606 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:39:03,032 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 310 mSDsluCounter, 755 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 937 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:03,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [310 Valid, 937 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 29 Invalid, 0 Unknown, 23 Unchecked, 0.0s Time] [2021-11-23 17:39:03,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8061 states. [2021-11-23 17:39:04,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8061 to 5757. [2021-11-23 17:39:04,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5757 states, 5756 states have (on average 1.2810979847116053) internal successors, (7374), 5756 states have internal predecessors, (7374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:04,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5757 states to 5757 states and 7374 transitions. [2021-11-23 17:39:04,317 INFO L78 Accepts]: Start accepts. Automaton has 5757 states and 7374 transitions. Word has length 104 [2021-11-23 17:39:04,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:04,318 INFO L470 AbstractCegarLoop]: Abstraction has 5757 states and 7374 transitions. [2021-11-23 17:39:04,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 25.0) internal successors, (250), 10 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:04,318 INFO L276 IsEmpty]: Start isEmpty. Operand 5757 states and 7374 transitions. [2021-11-23 17:39:04,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:39:04,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:04,320 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:39:04,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:04,522 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 17:39:04,729 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Ended with exit code 0 [2021-11-23 17:39:04,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:04,921 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:04,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:04,921 INFO L85 PathProgramCache]: Analyzing trace with hash -2091177837, now seen corresponding path program 1 times [2021-11-23 17:39:04,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:04,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [61076330] [2021-11-23 17:39:04,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:04,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:04,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:04,923 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:04,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:39:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:05,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:05,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:08,502 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:08,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:09,462 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:09,462 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:09,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [61076330] [2021-11-23 17:39:09,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [61076330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:09,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1801006462] [2021-11-23 17:39:09,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:09,463 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:09,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:09,464 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:09,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 17:39:09,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:09,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:39:09,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:12,936 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:12,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:14,839 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:14,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1801006462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:14,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839198008] [2021-11-23 17:39:14,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:14,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:14,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:14,840 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:14,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 17:39:14,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:14,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:39:14,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:17,550 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:17,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:18,254 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:18,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839198008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:18,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:18,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 18, 17, 17, 17] total 72 [2021-11-23 17:39:18,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992909865] [2021-11-23 17:39:18,255 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:18,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:39:18,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:18,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:39:18,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=4750, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:39:18,257 INFO L87 Difference]: Start difference. First operand 5757 states and 7374 transitions. Second operand has 72 states, 72 states have (on average 5.902777777777778) internal successors, (425), 72 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:22,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:22,702 INFO L93 Difference]: Finished difference Result 7934 states and 10222 transitions. [2021-11-23 17:39:22,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:39:22,703 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 5.902777777777778) internal successors, (425), 72 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:39:22,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:22,709 INFO L225 Difference]: With dead ends: 7934 [2021-11-23 17:39:22,710 INFO L226 Difference]: Without dead ends: 5898 [2021-11-23 17:39:22,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 554 SyntacticMatches, 3 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2593 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=584, Invalid=6898, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:39:22,713 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 300 mSDsluCounter, 2586 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 2681 SdHoareTripleChecker+Invalid, 778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 326 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:22,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 2681 Invalid, 778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 434 Invalid, 0 Unknown, 326 Unchecked, 0.4s Time] [2021-11-23 17:39:22,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5898 states. [2021-11-23 17:39:24,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5898 to 5747. [2021-11-23 17:39:24,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5747 states, 5746 states have (on average 1.2812391228680822) internal successors, (7362), 5746 states have internal predecessors, (7362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:24,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5747 states to 5747 states and 7362 transitions. [2021-11-23 17:39:24,049 INFO L78 Accepts]: Start accepts. Automaton has 5747 states and 7362 transitions. Word has length 104 [2021-11-23 17:39:24,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:24,049 INFO L470 AbstractCegarLoop]: Abstraction has 5747 states and 7362 transitions. [2021-11-23 17:39:24,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 5.902777777777778) internal successors, (425), 72 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:24,049 INFO L276 IsEmpty]: Start isEmpty. Operand 5747 states and 7362 transitions. [2021-11-23 17:39:24,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:39:24,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:24,051 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:39:24,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:24,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-23 17:39:24,460 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 17:39:24,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:24,652 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:24,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:24,652 INFO L85 PathProgramCache]: Analyzing trace with hash -403501744, now seen corresponding path program 1 times [2021-11-23 17:39:24,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:24,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [432066912] [2021-11-23 17:39:24,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:24,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:24,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:24,654 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:24,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 17:39:24,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:24,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:39:24,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:24,944 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:24,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:24,945 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:24,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [432066912] [2021-11-23 17:39:24,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [432066912] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:24,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:24,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:39:24,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257309616] [2021-11-23 17:39:24,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:24,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:39:24,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:24,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:39:24,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:39:24,946 INFO L87 Difference]: Start difference. First operand 5747 states and 7362 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 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 17:39:25,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:25,704 INFO L93 Difference]: Finished difference Result 8322 states and 10704 transitions. [2021-11-23 17:39:25,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:39:25,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 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 104 [2021-11-23 17:39:25,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:25,709 INFO L225 Difference]: With dead ends: 8322 [2021-11-23 17:39:25,709 INFO L226 Difference]: Without dead ends: 3162 [2021-11-23 17:39:25,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 102 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 17:39:25,714 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 43 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:25,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 201 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:39:25,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3162 states. [2021-11-23 17:39:26,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3162 to 3157. [2021-11-23 17:39:26,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3157 states, 3156 states have (on average 1.238276299112801) internal successors, (3908), 3156 states have internal predecessors, (3908), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:26,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3157 states to 3157 states and 3908 transitions. [2021-11-23 17:39:26,514 INFO L78 Accepts]: Start accepts. Automaton has 3157 states and 3908 transitions. Word has length 104 [2021-11-23 17:39:26,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:26,515 INFO L470 AbstractCegarLoop]: Abstraction has 3157 states and 3908 transitions. [2021-11-23 17:39:26,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 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 17:39:26,515 INFO L276 IsEmpty]: Start isEmpty. Operand 3157 states and 3908 transitions. [2021-11-23 17:39:26,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:39:26,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:26,517 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:39:26,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:26,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:26,719 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:26,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:26,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1043102243, now seen corresponding path program 1 times [2021-11-23 17:39:26,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:26,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1052551178] [2021-11-23 17:39:26,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:26,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:26,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:26,722 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:26,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:39:26,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:26,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:26,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:27,280 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:27,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:27,594 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:27,595 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:27,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1052551178] [2021-11-23 17:39:27,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1052551178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:27,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [579782597] [2021-11-23 17:39:27,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:27,595 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:27,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:27,596 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:27,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 17:39:27,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:27,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:39:27,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:30,678 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:30,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:31,339 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:31,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [579782597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:31,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687877837] [2021-11-23 17:39:31,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:31,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:31,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:31,340 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:31,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 17:39:31,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:31,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:39:31,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:34,957 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:34,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:36,283 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:36,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687877837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:36,283 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:36,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 16, 12, 20, 16] total 62 [2021-11-23 17:39:36,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027855196] [2021-11-23 17:39:36,284 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:36,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-23 17:39:36,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:36,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-23 17:39:36,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=3243, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 17:39:36,287 INFO L87 Difference]: Start difference. First operand 3157 states and 3908 transitions. Second operand has 62 states, 62 states have (on average 6.709677419354839) internal successors, (416), 62 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:38,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:38,826 INFO L93 Difference]: Finished difference Result 5073 states and 6283 transitions. [2021-11-23 17:39:38,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:39:38,827 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 6.709677419354839) internal successors, (416), 62 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:39:38,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:38,831 INFO L225 Difference]: With dead ends: 5073 [2021-11-23 17:39:38,831 INFO L226 Difference]: Without dead ends: 3993 [2021-11-23 17:39:38,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 639 GetRequests, 562 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2010 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=829, Invalid=4871, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 17:39:38,834 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 441 mSDsluCounter, 3518 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 3679 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 182 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:38,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [441 Valid, 3679 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 615 Invalid, 0 Unknown, 182 Unchecked, 0.6s Time] [2021-11-23 17:39:38,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3993 states. [2021-11-23 17:39:39,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3993 to 3163. [2021-11-23 17:39:39,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3163 states, 3162 states have (on average 1.2381404174573054) internal successors, (3915), 3162 states have internal predecessors, (3915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:39,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3163 states to 3163 states and 3915 transitions. [2021-11-23 17:39:39,592 INFO L78 Accepts]: Start accepts. Automaton has 3163 states and 3915 transitions. Word has length 104 [2021-11-23 17:39:39,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:39,593 INFO L470 AbstractCegarLoop]: Abstraction has 3163 states and 3915 transitions. [2021-11-23 17:39:39,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 6.709677419354839) internal successors, (416), 62 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 3163 states and 3915 transitions. [2021-11-23 17:39:39,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:39:39,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:39,595 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:39:39,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:39,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:39,997 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Ended with exit code 0 [2021-11-23 17:39:40,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:40,197 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:40,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:40,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1312722191, now seen corresponding path program 1 times [2021-11-23 17:39:40,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:40,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1463879223] [2021-11-23 17:39:40,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:40,199 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:40,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:40,200 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:40,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:39:40,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:40,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:40,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:44,284 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:44,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:46,141 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:46,141 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:46,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1463879223] [2021-11-23 17:39:46,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1463879223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:46,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [202210192] [2021-11-23 17:39:46,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:46,142 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:46,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:46,143 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:46,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 17:39:46,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:46,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:39:46,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:51,183 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:51,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:52,021 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:52,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [202210192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:52,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141804931] [2021-11-23 17:39:52,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:52,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:52,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:52,023 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:52,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 17:39:52,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:52,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:39:52,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:58,128 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:58,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:58,693 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:58,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141804931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:58,694 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:58,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18, 17, 17, 16] total 47 [2021-11-23 17:39:58,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786442002] [2021-11-23 17:39:58,694 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:58,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 17:39:58,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:58,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 17:39:58,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1969, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:39:58,696 INFO L87 Difference]: Start difference. First operand 3163 states and 3915 transitions. Second operand has 47 states, 47 states have (on average 5.574468085106383) internal successors, (262), 47 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:59,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:59,957 INFO L93 Difference]: Finished difference Result 4686 states and 5838 transitions. [2021-11-23 17:39:59,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:39:59,957 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 5.574468085106383) internal successors, (262), 47 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:39:59,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:59,963 INFO L225 Difference]: With dead ends: 4686 [2021-11-23 17:39:59,963 INFO L226 Difference]: Without dead ends: 3656 [2021-11-23 17:39:59,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 572 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=229, Invalid=2221, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:39:59,966 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 111 mSDsluCounter, 3368 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 3532 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 222 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:59,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 3532 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 237 Invalid, 0 Unknown, 222 Unchecked, 0.2s Time] [2021-11-23 17:39:59,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3656 states. [2021-11-23 17:40:00,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3656 to 3174. [2021-11-23 17:40:00,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3174 states, 3173 states have (on average 1.2376300031515917) internal successors, (3927), 3173 states have internal predecessors, (3927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:00,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3174 states to 3174 states and 3927 transitions. [2021-11-23 17:40:00,713 INFO L78 Accepts]: Start accepts. Automaton has 3174 states and 3927 transitions. Word has length 104 [2021-11-23 17:40:00,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:00,713 INFO L470 AbstractCegarLoop]: Abstraction has 3174 states and 3927 transitions. [2021-11-23 17:40:00,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 5.574468085106383) internal successors, (262), 47 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:00,714 INFO L276 IsEmpty]: Start isEmpty. Operand 3174 states and 3927 transitions. [2021-11-23 17:40:00,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:40:00,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:00,715 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:40:00,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 17:40:00,923 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Ended with exit code 0 [2021-11-23 17:40:01,117 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Ended with exit code 0 [2021-11-23 17:40:01,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:01,316 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:01,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:01,317 INFO L85 PathProgramCache]: Analyzing trace with hash -547400067, now seen corresponding path program 1 times [2021-11-23 17:40:01,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:01,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1789655388] [2021-11-23 17:40:01,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:01,317 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:01,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:01,318 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:01,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 17:40:01,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:01,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:40:01,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:01,792 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:01,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:02,066 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:02,066 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:02,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1789655388] [2021-11-23 17:40:02,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1789655388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:02,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [698417423] [2021-11-23 17:40:02,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:02,067 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:02,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:02,068 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:02,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 17:40:02,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:02,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:40:02,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:10,286 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:10,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:12,682 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:12,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [698417423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:12,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050243703] [2021-11-23 17:40:12,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:12,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:12,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:12,683 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:12,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 17:40:12,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:12,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:40:12,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:14,474 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:14,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:15,426 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:15,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050243703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:15,426 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:15,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 29, 20, 12, 11] total 78 [2021-11-23 17:40:15,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850520764] [2021-11-23 17:40:15,427 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:15,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-23 17:40:15,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:15,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-23 17:40:15,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=774, Invalid=5232, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 17:40:15,429 INFO L87 Difference]: Start difference. First operand 3174 states and 3927 transitions. Second operand has 78 states, 78 states have (on average 5.82051282051282) internal successors, (454), 78 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:18,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:18,800 INFO L93 Difference]: Finished difference Result 5084 states and 6367 transitions. [2021-11-23 17:40:18,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:40:18,801 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 5.82051282051282) internal successors, (454), 78 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:40:18,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:18,806 INFO L225 Difference]: With dead ends: 5084 [2021-11-23 17:40:18,806 INFO L226 Difference]: Without dead ends: 3949 [2021-11-23 17:40:18,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 547 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2960 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1164, Invalid=7026, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 17:40:18,809 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 472 mSDsluCounter, 4862 mSDsCounter, 0 mSdLazyCounter, 1214 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 5057 SdHoareTripleChecker+Invalid, 1800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 558 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:18,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [472 Valid, 5057 Invalid, 1800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1214 Invalid, 0 Unknown, 558 Unchecked, 1.2s Time] [2021-11-23 17:40:18,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3949 states. [2021-11-23 17:40:19,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3949 to 3084. [2021-11-23 17:40:19,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3084 states, 3083 states have (on average 1.238728511190399) internal successors, (3819), 3083 states have internal predecessors, (3819), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:19,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3084 states to 3084 states and 3819 transitions. [2021-11-23 17:40:19,544 INFO L78 Accepts]: Start accepts. Automaton has 3084 states and 3819 transitions. Word has length 104 [2021-11-23 17:40:19,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:19,545 INFO L470 AbstractCegarLoop]: Abstraction has 3084 states and 3819 transitions. [2021-11-23 17:40:19,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 5.82051282051282) internal successors, (454), 78 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:19,545 INFO L276 IsEmpty]: Start isEmpty. Operand 3084 states and 3819 transitions. [2021-11-23 17:40:19,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:40:19,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:19,546 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:40:19,570 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-23 17:40:19,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Ended with exit code 0 [2021-11-23 17:40:19,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Ended with exit code 0 [2021-11-23 17:40:20,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:20,147 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:20,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:20,148 INFO L85 PathProgramCache]: Analyzing trace with hash 987484608, now seen corresponding path program 1 times [2021-11-23 17:40:20,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:20,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2040722783] [2021-11-23 17:40:20,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:20,148 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:20,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:20,149 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:20,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 17:40:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:20,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:40:20,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:21,635 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:21,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:23,000 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:23,000 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:23,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2040722783] [2021-11-23 17:40:23,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2040722783] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:23,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1692045998] [2021-11-23 17:40:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:23,000 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:23,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:23,001 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:23,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 17:40:23,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:23,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:40:23,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:31,369 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:31,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:33,322 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:33,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1692045998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:33,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403358500] [2021-11-23 17:40:33,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:33,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:33,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:33,323 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:33,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 17:40:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:33,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:40:33,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:35,211 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:35,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:36,282 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:36,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403358500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:36,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:36,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 29, 20, 12, 11] total 88 [2021-11-23 17:40:36,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873100862] [2021-11-23 17:40:36,283 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:36,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:40:36,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:36,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:40:36,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=831, Invalid=6825, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:40:36,286 INFO L87 Difference]: Start difference. First operand 3084 states and 3819 transitions. Second operand has 88 states, 88 states have (on average 5.159090909090909) internal successors, (454), 88 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:41,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:41,789 INFO L93 Difference]: Finished difference Result 7615 states and 9453 transitions. [2021-11-23 17:40:41,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 17:40:41,789 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 5.159090909090909) internal successors, (454), 88 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:40:41,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:41,795 INFO L225 Difference]: With dead ends: 7615 [2021-11-23 17:40:41,795 INFO L226 Difference]: Without dead ends: 5977 [2021-11-23 17:40:41,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 641 GetRequests, 534 SyntacticMatches, 5 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 3600 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=1249, Invalid=9463, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 17:40:41,799 INFO L933 BasicCegarLoop]: 306 mSDtfsCounter, 814 mSDsluCounter, 8391 mSDsCounter, 0 mSdLazyCounter, 1163 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 814 SdHoareTripleChecker+Valid, 8697 SdHoareTripleChecker+Invalid, 3108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1917 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:41,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [814 Valid, 8697 Invalid, 3108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1163 Invalid, 0 Unknown, 1917 Unchecked, 1.3s Time] [2021-11-23 17:40:41,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5977 states. [2021-11-23 17:40:42,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5977 to 3144. [2021-11-23 17:40:42,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 3143 states have (on average 1.23576201081769) internal successors, (3884), 3143 states have internal predecessors, (3884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:42,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 3884 transitions. [2021-11-23 17:40:42,594 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 3884 transitions. Word has length 104 [2021-11-23 17:40:42,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:42,595 INFO L470 AbstractCegarLoop]: Abstraction has 3144 states and 3884 transitions. [2021-11-23 17:40:42,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 5.159090909090909) internal successors, (454), 88 states have internal predecessors, (454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:42,595 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 3884 transitions. [2021-11-23 17:40:42,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:40:42,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:42,596 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:40:42,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:42,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2021-11-23 17:40:42,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:43,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:43,197 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:43,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:43,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1243377617, now seen corresponding path program 1 times [2021-11-23 17:40:43,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:43,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [332943278] [2021-11-23 17:40:43,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:43,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:43,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:43,199 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:43,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:40:43,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:43,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:40:43,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:47,459 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:47,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:49,111 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:49,111 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:49,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [332943278] [2021-11-23 17:40:49,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [332943278] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:49,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1217385636] [2021-11-23 17:40:49,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:49,112 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:49,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:49,113 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:49,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:40:49,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:49,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:40:49,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:55,462 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:55,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:57,067 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:57,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1217385636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869249449] [2021-11-23 17:40:57,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:57,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:57,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:57,069 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:57,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:40:57,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:57,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:40:57,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:05,620 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:05,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:09,033 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:09,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869249449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:09,033 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:09,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 19, 18, 27, 23] total 87 [2021-11-23 17:41:09,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026049577] [2021-11-23 17:41:09,034 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:09,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-23 17:41:09,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:09,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-23 17:41:09,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=591, Invalid=6891, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:41:09,035 INFO L87 Difference]: Start difference. First operand 3144 states and 3884 transitions. Second operand has 87 states, 87 states have (on average 4.402298850574713) internal successors, (383), 87 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:18,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:18,864 INFO L93 Difference]: Finished difference Result 7516 states and 9347 transitions. [2021-11-23 17:41:18,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-23 17:41:18,865 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 4.402298850574713) internal successors, (383), 87 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:41:18,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:18,871 INFO L225 Difference]: With dead ends: 7516 [2021-11-23 17:41:18,871 INFO L226 Difference]: Without dead ends: 4945 [2021-11-23 17:41:18,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 531 SyntacticMatches, 3 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4703 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=951, Invalid=11931, Unknown=0, NotChecked=0, Total=12882 [2021-11-23 17:41:18,875 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 444 mSDsluCounter, 7906 mSDsCounter, 0 mSdLazyCounter, 1720 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 444 SdHoareTripleChecker+Valid, 8134 SdHoareTripleChecker+Invalid, 3204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1720 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1446 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:18,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [444 Valid, 8134 Invalid, 3204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1720 Invalid, 0 Unknown, 1446 Unchecked, 2.1s Time] [2021-11-23 17:41:18,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4945 states. [2021-11-23 17:41:19,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4945 to 3144. [2021-11-23 17:41:19,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 3143 states have (on average 1.23576201081769) internal successors, (3884), 3143 states have internal predecessors, (3884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:19,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 3884 transitions. [2021-11-23 17:41:19,702 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 3884 transitions. Word has length 104 [2021-11-23 17:41:19,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:19,702 INFO L470 AbstractCegarLoop]: Abstraction has 3144 states and 3884 transitions. [2021-11-23 17:41:19,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 4.402298850574713) internal successors, (383), 87 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:19,702 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 3884 transitions. [2021-11-23 17:41:19,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:41:19,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:19,704 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:41:19,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:19,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:20,130 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2021-11-23 17:41:20,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:20,308 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:20,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:20,308 INFO L85 PathProgramCache]: Analyzing trace with hash 715365375, now seen corresponding path program 1 times [2021-11-23 17:41:20,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:20,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1951558328] [2021-11-23 17:41:20,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:20,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:20,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:20,310 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:20,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:41:20,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:20,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:41:20,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:20,738 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:20,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:21,098 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:21,098 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:21,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1951558328] [2021-11-23 17:41:21,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1951558328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:21,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1408664498] [2021-11-23 17:41:21,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:21,099 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:21,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:21,100 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:21,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 17:41:21,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:21,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:41:21,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:23,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:23,598 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:23,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1408664498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:23,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331670056] [2021-11-23 17:41:23,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:23,598 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:23,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:23,599 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:23,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 17:41:23,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:23,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:41:23,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:25,174 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:25,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:25,442 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:25,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331670056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:25,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:25,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 14, 11, 14, 11] total 31 [2021-11-23 17:41:25,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206566590] [2021-11-23 17:41:25,442 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:25,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 17:41:25,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:25,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 17:41:25,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=812, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:41:25,444 INFO L87 Difference]: Start difference. First operand 3144 states and 3884 transitions. Second operand has 31 states, 31 states have (on average 7.032258064516129) internal successors, (218), 31 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:26,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:26,578 INFO L93 Difference]: Finished difference Result 4932 states and 6226 transitions. [2021-11-23 17:41:26,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:41:26,579 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 7.032258064516129) internal successors, (218), 31 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-23 17:41:26,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:26,582 INFO L225 Difference]: With dead ends: 4932 [2021-11-23 17:41:26,583 INFO L226 Difference]: Without dead ends: 3817 [2021-11-23 17:41:26,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 588 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:41:26,584 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 241 mSDsluCounter, 1916 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 2085 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:26,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 2085 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 120 Invalid, 0 Unknown, 96 Unchecked, 0.1s Time] [2021-11-23 17:41:26,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3817 states. [2021-11-23 17:41:27,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3817 to 3055. [2021-11-23 17:41:27,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3055 states, 3054 states have (on average 1.2380484610347087) internal successors, (3781), 3054 states have internal predecessors, (3781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:27,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3055 states to 3055 states and 3781 transitions. [2021-11-23 17:41:27,334 INFO L78 Accepts]: Start accepts. Automaton has 3055 states and 3781 transitions. Word has length 104 [2021-11-23 17:41:27,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:27,335 INFO L470 AbstractCegarLoop]: Abstraction has 3055 states and 3781 transitions. [2021-11-23 17:41:27,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 7.032258064516129) internal successors, (218), 31 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:27,335 INFO L276 IsEmpty]: Start isEmpty. Operand 3055 states and 3781 transitions. [2021-11-23 17:41:27,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-23 17:41:27,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:27,336 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:41:27,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:27,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:27,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:27,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:27,937 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:27,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:27,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1400754564, now seen corresponding path program 1 times [2021-11-23 17:41:27,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:27,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250316086] [2021-11-23 17:41:27,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:27,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:27,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:27,939 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:27,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:41:28,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:28,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:41:28,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:28,457 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:28,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:28,706 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:28,707 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:28,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250316086] [2021-11-23 17:41:28,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [250316086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:28,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1334318131] [2021-11-23 17:41:28,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:28,708 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:28,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:28,708 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:28,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:41:28,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:28,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:41:28,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:28,984 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:41:28,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:41:28,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1334318131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:41:28,984 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:41:28,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 8 [2021-11-23 17:41:28,985 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627541552] [2021-11-23 17:41:28,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:41:28,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:41:28,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:28,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:41:28,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:41:28,986 INFO L87 Difference]: Start difference. First operand 3055 states and 3781 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 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 17:41:30,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:30,035 INFO L93 Difference]: Finished difference Result 6771 states and 8389 transitions. [2021-11-23 17:41:30,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:41:30,035 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 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 105 [2021-11-23 17:41:30,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:30,040 INFO L225 Difference]: With dead ends: 6771 [2021-11-23 17:41:30,040 INFO L226 Difference]: Without dead ends: 4209 [2021-11-23 17:41:30,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 305 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:41:30,043 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 70 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:30,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 190 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:41:30,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4209 states. [2021-11-23 17:41:31,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4209 to 4167. [2021-11-23 17:41:31,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4167 states, 4166 states have (on average 1.1946711473835814) internal successors, (4977), 4166 states have internal predecessors, (4977), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:31,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4167 states to 4167 states and 4977 transitions. [2021-11-23 17:41:31,089 INFO L78 Accepts]: Start accepts. Automaton has 4167 states and 4977 transitions. Word has length 105 [2021-11-23 17:41:31,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:31,090 INFO L470 AbstractCegarLoop]: Abstraction has 4167 states and 4977 transitions. [2021-11-23 17:41:31,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 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 17:41:31,090 INFO L276 IsEmpty]: Start isEmpty. Operand 4167 states and 4977 transitions. [2021-11-23 17:41:31,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-23 17:41:31,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:31,091 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:41:31,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:31,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:31,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:31,492 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:31,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:31,492 INFO L85 PathProgramCache]: Analyzing trace with hash 2105489062, now seen corresponding path program 1 times [2021-11-23 17:41:31,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:31,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2072783008] [2021-11-23 17:41:31,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:31,493 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:31,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:31,501 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:31,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:41:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:31,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:31,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:31,991 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:31,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:32,287 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:32,287 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:32,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2072783008] [2021-11-23 17:41:32,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2072783008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:32,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [633855407] [2021-11-23 17:41:32,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:32,288 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:32,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:32,288 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:32,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:41:32,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:32,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:41:32,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:36,068 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:36,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:38,258 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:38,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [633855407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:38,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251786782] [2021-11-23 17:41:38,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:38,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:38,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:38,260 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:38,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:41:38,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:38,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:41:38,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:40,896 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:40,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:41,838 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:41,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251786782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:41,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:41,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 23, 22, 17, 16] total 70 [2021-11-23 17:41:41,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736481001] [2021-11-23 17:41:41,839 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:41,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-23 17:41:41,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:41,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-23 17:41:41,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=4251, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:41:41,841 INFO L87 Difference]: Start difference. First operand 4167 states and 4977 transitions. Second operand has 70 states, 70 states have (on average 6.014285714285714) internal successors, (421), 70 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:43,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:43,929 INFO L93 Difference]: Finished difference Result 5704 states and 6872 transitions. [2021-11-23 17:41:43,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:41:43,930 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 6.014285714285714) internal successors, (421), 70 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 105 [2021-11-23 17:41:43,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:43,934 INFO L225 Difference]: With dead ends: 5704 [2021-11-23 17:41:43,935 INFO L226 Difference]: Without dead ends: 4178 [2021-11-23 17:41:43,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 549 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2463 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=729, Invalid=4821, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:41:43,938 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 620 mSDsluCounter, 3367 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 620 SdHoareTripleChecker+Valid, 3505 SdHoareTripleChecker+Invalid, 1014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 568 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:43,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [620 Valid, 3505 Invalid, 1014 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 424 Invalid, 0 Unknown, 568 Unchecked, 0.5s Time] [2021-11-23 17:41:43,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4178 states. [2021-11-23 17:41:45,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4178 to 4172. [2021-11-23 17:41:45,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4172 states, 4171 states have (on average 1.1946775353632222) internal successors, (4983), 4171 states have internal predecessors, (4983), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:45,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4172 states to 4172 states and 4983 transitions. [2021-11-23 17:41:45,020 INFO L78 Accepts]: Start accepts. Automaton has 4172 states and 4983 transitions. Word has length 105 [2021-11-23 17:41:45,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:45,020 INFO L470 AbstractCegarLoop]: Abstraction has 4172 states and 4983 transitions. [2021-11-23 17:41:45,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 6.014285714285714) internal successors, (421), 70 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:45,021 INFO L276 IsEmpty]: Start isEmpty. Operand 4172 states and 4983 transitions. [2021-11-23 17:41:45,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:41:45,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:45,022 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:41:45,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:45,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-23 17:41:45,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:45,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:41:45,623 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:45,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:45,623 INFO L85 PathProgramCache]: Analyzing trace with hash 2004242558, now seen corresponding path program 1 times [2021-11-23 17:41:45,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:45,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1624122077] [2021-11-23 17:41:45,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:45,624 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:45,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:45,625 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:45,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:41:45,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:45,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:45,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:46,167 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:46,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:46,484 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:46,484 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:46,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1624122077] [2021-11-23 17:41:46,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1624122077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:46,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1900218408] [2021-11-23 17:41:46,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:46,485 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:46,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:46,486 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:46,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:41:46,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:46,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:41:46,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:49,600 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:49,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:51,595 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:51,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1900218408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:51,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948140806] [2021-11-23 17:41:51,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:51,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:51,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:51,596 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:51,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:41:51,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:51,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:41:51,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:54,744 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:54,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:55,517 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:55,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948140806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:55,517 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:55,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 22, 20, 15, 12] total 69 [2021-11-23 17:41:55,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574623081] [2021-11-23 17:41:55,518 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:55,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-23 17:41:55,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:55,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-23 17:41:55,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=623, Invalid=4069, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 17:41:55,520 INFO L87 Difference]: Start difference. First operand 4172 states and 4983 transitions. Second operand has 69 states, 69 states have (on average 5.942028985507246) internal successors, (410), 69 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 17:41:57,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:57,423 INFO L93 Difference]: Finished difference Result 7973 states and 9567 transitions. [2021-11-23 17:41:57,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:41:57,424 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 5.942028985507246) internal successors, (410), 69 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) Word has length 106 [2021-11-23 17:41:57,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:57,427 INFO L225 Difference]: With dead ends: 7973 [2021-11-23 17:41:57,427 INFO L226 Difference]: Without dead ends: 4280 [2021-11-23 17:41:57,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 562 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2115 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=724, Invalid=4388, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:41:57,431 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 439 mSDsluCounter, 3153 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 3291 SdHoareTripleChecker+Invalid, 927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 289 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:57,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 3291 Invalid, 927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 610 Invalid, 0 Unknown, 289 Unchecked, 0.6s Time] [2021-11-23 17:41:57,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4280 states. [2021-11-23 17:41:58,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4280 to 4131. [2021-11-23 17:41:58,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4131 states, 4130 states have (on average 1.1963680387409201) internal successors, (4941), 4130 states have internal predecessors, (4941), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:58,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4131 states to 4131 states and 4941 transitions. [2021-11-23 17:41:58,359 INFO L78 Accepts]: Start accepts. Automaton has 4131 states and 4941 transitions. Word has length 106 [2021-11-23 17:41:58,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:58,360 INFO L470 AbstractCegarLoop]: Abstraction has 4131 states and 4941 transitions. [2021-11-23 17:41:58,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 5.942028985507246) internal successors, (410), 69 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 17:41:58,360 INFO L276 IsEmpty]: Start isEmpty. Operand 4131 states and 4941 transitions. [2021-11-23 17:41:58,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:41:58,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:58,361 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:41:58,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:41:58,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:58,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:58,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:58,963 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:58,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:58,964 INFO L85 PathProgramCache]: Analyzing trace with hash 810698928, now seen corresponding path program 1 times [2021-11-23 17:41:58,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:58,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2029824192] [2021-11-23 17:41:58,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:58,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:58,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:58,966 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:59,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:41:59,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:59,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:59,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:59,565 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:59,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:59,833 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:59,833 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:59,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2029824192] [2021-11-23 17:41:59,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2029824192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:59,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1368996811] [2021-11-23 17:41:59,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:59,833 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:59,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:59,835 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:59,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:42:00,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:00,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:42:00,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:04,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:07,646 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:07,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1368996811] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:07,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338203435] [2021-11-23 17:42:07,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:07,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:07,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:07,648 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:07,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:42:07,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:07,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:42:07,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:42:12,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:42:12,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338203435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:42:12,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:42:12,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [11, 11, 28, 22] total 74 [2021-11-23 17:42:12,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502828901] [2021-11-23 17:42:12,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:42:12,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:42:12,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:12,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:42:12,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=4553, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 17:42:12,437 INFO L87 Difference]: Start difference. First operand 4131 states and 4941 transitions. Second operand has 22 states, 22 states have (on average 4.454545454545454) internal successors, (98), 22 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 17:42:16,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:16,099 INFO L93 Difference]: Finished difference Result 10563 states and 12688 transitions. [2021-11-23 17:42:16,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:42:16,099 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.454545454545454) internal successors, (98), 22 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 106 [2021-11-23 17:42:16,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:16,107 INFO L225 Difference]: With dead ends: 10563 [2021-11-23 17:42:16,107 INFO L226 Difference]: Without dead ends: 6768 [2021-11-23 17:42:16,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 452 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2175 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1195, Invalid=5777, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:42:16,113 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 454 mSDsluCounter, 798 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 1009 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:16,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [454 Valid, 1009 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 17:42:16,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6768 states. [2021-11-23 17:42:17,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6768 to 4052. [2021-11-23 17:42:17,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4052 states, 4051 states have (on average 1.1977289558133795) internal successors, (4852), 4051 states have internal predecessors, (4852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:17,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4052 states to 4052 states and 4852 transitions. [2021-11-23 17:42:17,187 INFO L78 Accepts]: Start accepts. Automaton has 4052 states and 4852 transitions. Word has length 106 [2021-11-23 17:42:17,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:17,187 INFO L470 AbstractCegarLoop]: Abstraction has 4052 states and 4852 transitions. [2021-11-23 17:42:17,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.454545454545454) internal successors, (98), 22 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 17:42:17,188 INFO L276 IsEmpty]: Start isEmpty. Operand 4052 states and 4852 transitions. [2021-11-23 17:42:17,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:42:17,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:17,189 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:42:17,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Ended with exit code 0 [2021-11-23 17:42:17,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 17:42:17,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:17,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:17,790 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:17,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:17,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1118279012, now seen corresponding path program 1 times [2021-11-23 17:42:17,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:17,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1230618714] [2021-11-23 17:42:17,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:17,791 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:17,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:17,792 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:17,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:42:17,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:17,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:42:17,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:22,100 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:22,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:23,532 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:23,532 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:23,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1230618714] [2021-11-23 17:42:23,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1230618714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:23,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1475276093] [2021-11-23 17:42:23,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:23,533 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:23,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:23,534 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:23,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:42:23,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:23,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:42:23,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:28,629 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:28,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:30,069 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:30,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1475276093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:30,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154417918] [2021-11-23 17:42:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:30,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:30,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:30,071 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:30,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:42:30,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:30,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:42:30,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:36,532 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:36,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:37,464 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:37,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154417918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:37,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:37,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 19, 18, 19, 18] total 48 [2021-11-23 17:42:37,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845868559] [2021-11-23 17:42:37,465 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:37,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:42:37,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:37,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:42:37,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2066, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:42:37,466 INFO L87 Difference]: Start difference. First operand 4052 states and 4852 transitions. Second operand has 48 states, 48 states have (on average 5.3125) internal successors, (255), 48 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:39,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:39,998 INFO L93 Difference]: Finished difference Result 8903 states and 10668 transitions. [2021-11-23 17:42:39,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:42:39,999 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.3125) internal successors, (255), 48 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-23 17:42:39,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:40,004 INFO L225 Difference]: With dead ends: 8903 [2021-11-23 17:42:40,004 INFO L226 Difference]: Without dead ends: 5219 [2021-11-23 17:42:40,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 580 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=247, Invalid=2509, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:42:40,007 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 149 mSDsluCounter, 4014 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 4193 SdHoareTripleChecker+Invalid, 1074 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 540 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:40,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 4193 Invalid, 1074 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 525 Invalid, 0 Unknown, 540 Unchecked, 0.5s Time] [2021-11-23 17:42:40,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5219 states. [2021-11-23 17:42:41,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5219 to 4001. [2021-11-23 17:42:41,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4001 states, 4000 states have (on average 1.1995) internal successors, (4798), 4000 states have internal predecessors, (4798), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:41,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4001 states to 4001 states and 4798 transitions. [2021-11-23 17:42:41,038 INFO L78 Accepts]: Start accepts. Automaton has 4001 states and 4798 transitions. Word has length 106 [2021-11-23 17:42:41,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:41,039 INFO L470 AbstractCegarLoop]: Abstraction has 4001 states and 4798 transitions. [2021-11-23 17:42:41,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.3125) internal successors, (255), 48 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:41,039 INFO L276 IsEmpty]: Start isEmpty. Operand 4001 states and 4798 transitions. [2021-11-23 17:42:41,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 17:42:41,043 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:41,043 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:42:41,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:41,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Ended with exit code 0 [2021-11-23 17:42:41,461 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2021-11-23 17:42:41,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:41,660 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:41,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:41,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1883350131, now seen corresponding path program 1 times [2021-11-23 17:42:41,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:41,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368983825] [2021-11-23 17:42:41,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:41,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:41,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:41,662 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:41,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:42:41,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:41,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:42:41,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:44,051 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:42:44,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:44,739 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:42:44,739 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:44,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368983825] [2021-11-23 17:42:44,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368983825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:44,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [689904277] [2021-11-23 17:42:44,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:44,740 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:44,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:44,741 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:44,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:42:44,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:44,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:42:44,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:47,294 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:42:47,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:47,803 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:42:47,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [689904277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:47,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810121923] [2021-11-23 17:42:47,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:47,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:47,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:47,804 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:47,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:42:47,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:47,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:42:47,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:48,792 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:42:48,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:49,650 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:42:49,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810121923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:49,650 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:49,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 4, 4] total 31 [2021-11-23 17:42:49,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314846037] [2021-11-23 17:42:49,651 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:49,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:42:49,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:49,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:42:49,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:42:49,652 INFO L87 Difference]: Start difference. First operand 4001 states and 4798 transitions. Second operand has 32 states, 32 states have (on average 13.5625) internal successors, (434), 31 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:51,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:51,527 INFO L93 Difference]: Finished difference Result 7704 states and 9284 transitions. [2021-11-23 17:42:51,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:42:51,528 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 13.5625) internal successors, (434), 31 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have 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 17:42:51,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:51,532 INFO L225 Difference]: With dead ends: 7704 [2021-11-23 17:42:51,532 INFO L226 Difference]: Without dead ends: 4030 [2021-11-23 17:42:51,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 909 GetRequests, 863 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=297, Invalid=1959, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:42:51,537 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 142 mSDsluCounter, 1246 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 1331 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:51,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 1331 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 103 Invalid, 0 Unknown, 140 Unchecked, 0.1s Time] [2021-11-23 17:42:51,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4030 states. [2021-11-23 17:42:52,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4030 to 3990. [2021-11-23 17:42:52,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3990 states, 3989 states have (on average 1.1997994484833292) internal successors, (4786), 3989 states have internal predecessors, (4786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:52,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3990 states to 3990 states and 4786 transitions. [2021-11-23 17:42:52,592 INFO L78 Accepts]: Start accepts. Automaton has 3990 states and 4786 transitions. Word has length 149 [2021-11-23 17:42:52,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:52,592 INFO L470 AbstractCegarLoop]: Abstraction has 3990 states and 4786 transitions. [2021-11-23 17:42:52,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 13.5625) internal successors, (434), 31 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:52,592 INFO L276 IsEmpty]: Start isEmpty. Operand 3990 states and 4786 transitions. [2021-11-23 17:42:52,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 17:42:52,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:52,595 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:42:52,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Ended with exit code 0 [2021-11-23 17:42:52,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:53,020 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 17:42:53,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:53,196 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:53,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:53,196 INFO L85 PathProgramCache]: Analyzing trace with hash -804439054, now seen corresponding path program 1 times [2021-11-23 17:42:53,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:53,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1768288505] [2021-11-23 17:42:53,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:53,197 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:53,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:53,200 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:53,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 17:42:53,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:53,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:53,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:55,655 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:42:55,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:56,366 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:42:56,367 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:56,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1768288505] [2021-11-23 17:42:56,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1768288505] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:56,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [41454051] [2021-11-23 17:42:56,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:56,367 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:56,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:56,368 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:56,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2021-11-23 17:42:56,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:56,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:56,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:42:59,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:00,066 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:00,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [41454051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:00,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538374714] [2021-11-23 17:43:00,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:00,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:00,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:00,069 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:00,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 17:43:00,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:00,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:43:00,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:01,124 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:01,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:02,080 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:02,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538374714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:02,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:02,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 4, 4] total 29 [2021-11-23 17:43:02,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635080191] [2021-11-23 17:43:02,081 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:02,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:43:02,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:02,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:43:02,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:43:02,083 INFO L87 Difference]: Start difference. First operand 3990 states and 4786 transitions. Second operand has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:03,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:03,867 INFO L93 Difference]: Finished difference Result 7762 states and 9344 transitions. [2021-11-23 17:43:03,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:43:03,867 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have 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 17:43:03,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:03,872 INFO L225 Difference]: With dead ends: 7762 [2021-11-23 17:43:03,872 INFO L226 Difference]: Without dead ends: 4088 [2021-11-23 17:43:03,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 865 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=259, Invalid=1633, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:43:03,876 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 170 mSDsluCounter, 1158 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 1250 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:03,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 1250 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 111 Invalid, 0 Unknown, 126 Unchecked, 0.1s Time] [2021-11-23 17:43:03,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4088 states. [2021-11-23 17:43:04,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4088 to 4061. [2021-11-23 17:43:04,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4061 states, 4060 states have (on average 1.1970443349753694) internal successors, (4860), 4060 states have internal predecessors, (4860), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:04,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4061 states to 4061 states and 4860 transitions. [2021-11-23 17:43:04,980 INFO L78 Accepts]: Start accepts. Automaton has 4061 states and 4860 transitions. Word has length 149 [2021-11-23 17:43:04,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:04,980 INFO L470 AbstractCegarLoop]: Abstraction has 4061 states and 4860 transitions. [2021-11-23 17:43:04,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:04,981 INFO L276 IsEmpty]: Start isEmpty. Operand 4061 states and 4860 transitions. [2021-11-23 17:43:04,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 17:43:04,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:04,983 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:04,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:05,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Ended with exit code 0 [2021-11-23 17:43:05,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:05,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:05,584 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:05,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:05,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1183059852, now seen corresponding path program 1 times [2021-11-23 17:43:05,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:05,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [851799866] [2021-11-23 17:43:05,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:05,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:05,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:05,586 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:05,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 17:43:05,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:05,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:05,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:07,155 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:07,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:07,784 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:07,784 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:07,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [851799866] [2021-11-23 17:43:07,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [851799866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:07,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1258327753] [2021-11-23 17:43:07,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:07,785 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:07,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:07,786 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:07,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2021-11-23 17:43:08,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:08,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:08,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:09,654 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:09,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:10,257 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:10,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1258327753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:10,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21942386] [2021-11-23 17:43:10,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:10,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:10,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:10,259 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:10,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-23 17:43:10,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:10,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:43:10,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:11,111 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:11,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:11,874 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:11,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21942386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:11,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:11,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:43:11,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720972215] [2021-11-23 17:43:11,875 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:11,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:43:11,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:11,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:43:11,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:43:11,876 INFO L87 Difference]: Start difference. First operand 4061 states and 4860 transitions. Second operand has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:14,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:14,069 INFO L93 Difference]: Finished difference Result 8540 states and 10348 transitions. [2021-11-23 17:43:14,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:43:14,069 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have 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 17:43:14,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:14,074 INFO L225 Difference]: With dead ends: 8540 [2021-11-23 17:43:14,074 INFO L226 Difference]: Without dead ends: 4866 [2021-11-23 17:43:14,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 918 GetRequests, 874 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=350, Invalid=1720, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:43:14,076 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 320 mSDsluCounter, 1459 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 1582 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 393 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:14,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 1582 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 205 Invalid, 0 Unknown, 393 Unchecked, 0.2s Time] [2021-11-23 17:43:14,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4866 states. [2021-11-23 17:43:15,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4866 to 4087. [2021-11-23 17:43:15,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4087 states, 4086 states have (on average 1.2065589818893783) internal successors, (4930), 4086 states have internal predecessors, (4930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:15,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4087 states to 4087 states and 4930 transitions. [2021-11-23 17:43:15,192 INFO L78 Accepts]: Start accepts. Automaton has 4087 states and 4930 transitions. Word has length 149 [2021-11-23 17:43:15,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:15,192 INFO L470 AbstractCegarLoop]: Abstraction has 4087 states and 4930 transitions. [2021-11-23 17:43:15,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 19.727272727272727) internal successors, (434), 21 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:15,193 INFO L276 IsEmpty]: Start isEmpty. Operand 4087 states and 4930 transitions. [2021-11-23 17:43:15,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 17:43:15,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:15,195 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:15,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:15,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Ended with exit code 0 [2021-11-23 17:43:15,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:15,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:15,799 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:15,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:15,799 INFO L85 PathProgramCache]: Analyzing trace with hash -2032996367, now seen corresponding path program 1 times [2021-11-23 17:43:15,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:15,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [503773211] [2021-11-23 17:43:15,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:15,800 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:15,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:15,801 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:15,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2021-11-23 17:43:15,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:15,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:15,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:18,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:18,744 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:18,744 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:18,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [503773211] [2021-11-23 17:43:18,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [503773211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:18,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194952034] [2021-11-23 17:43:18,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:18,744 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:18,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:18,745 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:18,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Waiting until timeout for monitored process [2021-11-23 17:43:18,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:18,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:18,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:21,505 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:21,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:22,147 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:22,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194952034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:22,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536391779] [2021-11-23 17:43:22,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:22,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:22,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:22,148 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:22,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-23 17:43:22,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:22,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:43:22,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:23,181 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:23,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:24,121 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:24,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536391779] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:24,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:24,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 4, 4] total 29 [2021-11-23 17:43:24,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483300162] [2021-11-23 17:43:24,122 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:24,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:43:24,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:24,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:43:24,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:43:24,123 INFO L87 Difference]: Start difference. First operand 4087 states and 4930 transitions. Second operand has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:25,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:25,931 INFO L93 Difference]: Finished difference Result 7901 states and 9578 transitions. [2021-11-23 17:43:25,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:43:25,931 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have 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 17:43:25,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:25,935 INFO L225 Difference]: With dead ends: 7901 [2021-11-23 17:43:25,935 INFO L226 Difference]: Without dead ends: 4127 [2021-11-23 17:43:25,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 909 GetRequests, 867 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:43:25,939 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 181 mSDsluCounter, 1706 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 1837 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 263 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:25,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 1837 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 0 Unknown, 263 Unchecked, 0.1s Time] [2021-11-23 17:43:25,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4127 states. [2021-11-23 17:43:26,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4127 to 4046. [2021-11-23 17:43:26,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4046 states, 4045 states have (on average 1.2086526576019778) internal successors, (4889), 4045 states have internal predecessors, (4889), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:26,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4046 states to 4046 states and 4889 transitions. [2021-11-23 17:43:26,989 INFO L78 Accepts]: Start accepts. Automaton has 4046 states and 4889 transitions. Word has length 149 [2021-11-23 17:43:26,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:26,989 INFO L470 AbstractCegarLoop]: Abstraction has 4046 states and 4889 transitions. [2021-11-23 17:43:26,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 14.8) internal successors, (444), 29 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:26,989 INFO L276 IsEmpty]: Start isEmpty. Operand 4046 states and 4889 transitions. [2021-11-23 17:43:26,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 17:43:26,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:26,991 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:26,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:27,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:27,401 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Ended with exit code 0 [2021-11-23 17:43:27,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:43:27,593 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:27,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:27,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1206927219, now seen corresponding path program 1 times [2021-11-23 17:43:27,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:27,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [870662532] [2021-11-23 17:43:27,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:27,594 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:27,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:27,595 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:27,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Waiting until timeout for monitored process [2021-11-23 17:43:27,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:27,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:27,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:29,503 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:29,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:29,998 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:29,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:29,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [870662532] [2021-11-23 17:43:29,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [870662532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:29,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [293553396] [2021-11-23 17:43:29,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:29,999 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:29,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:30,000 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:30,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Waiting until timeout for monitored process [2021-11-23 17:43:30,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:30,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:30,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:32,326 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:32,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:32,763 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:32,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [293553396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:32,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854842875] [2021-11-23 17:43:32,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:32,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:32,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:32,765 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:32,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-23 17:43:32,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:32,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:43:32,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:33,752 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:33,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:34,686 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 61 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:34,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854842875] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:34,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:34,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:43:34,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222609387] [2021-11-23 17:43:34,687 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:34,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:43:34,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:34,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:43:34,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:43:34,689 INFO L87 Difference]: Start difference. First operand 4046 states and 4889 transitions. Second operand has 22 states, 22 states have (on average 20.363636363636363) internal successors, (448), 21 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:38,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:38,421 INFO L93 Difference]: Finished difference Result 9028 states and 10826 transitions. [2021-11-23 17:43:38,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-23 17:43:38,422 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 20.363636363636363) internal successors, (448), 21 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2021-11-23 17:43:38,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:38,427 INFO L225 Difference]: With dead ends: 9028 [2021-11-23 17:43:38,427 INFO L226 Difference]: Without dead ends: 5254 [2021-11-23 17:43:38,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 871 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1086 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=634, Invalid=3398, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 17:43:38,430 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 724 mSDsluCounter, 2048 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 724 SdHoareTripleChecker+Valid, 2237 SdHoareTripleChecker+Invalid, 1488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1014 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:38,430 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [724 Valid, 2237 Invalid, 1488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 441 Invalid, 0 Unknown, 1014 Unchecked, 0.4s Time] [2021-11-23 17:43:38,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5254 states. [2021-11-23 17:43:39,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5254 to 2449. [2021-11-23 17:43:39,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2449 states, 2448 states have (on average 1.170343137254902) internal successors, (2865), 2448 states have internal predecessors, (2865), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:39,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2449 states to 2449 states and 2865 transitions. [2021-11-23 17:43:39,360 INFO L78 Accepts]: Start accepts. Automaton has 2449 states and 2865 transitions. Word has length 149 [2021-11-23 17:43:39,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:39,360 INFO L470 AbstractCegarLoop]: Abstraction has 2449 states and 2865 transitions. [2021-11-23 17:43:39,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 20.363636363636363) internal successors, (448), 21 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:39,361 INFO L276 IsEmpty]: Start isEmpty. Operand 2449 states and 2865 transitions. [2021-11-23 17:43:39,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-23 17:43:39,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:39,363 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:39,365 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Ended with exit code 0 [2021-11-23 17:43:39,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:39,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Ended with exit code 0 [2021-11-23 17:43:39,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:43:39,964 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:39,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:39,964 INFO L85 PathProgramCache]: Analyzing trace with hash 926148742, now seen corresponding path program 1 times [2021-11-23 17:43:39,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:39,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [220373640] [2021-11-23 17:43:39,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:39,965 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:39,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:39,966 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:39,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2021-11-23 17:43:40,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:40,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:40,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:41,819 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:43:41,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:42,374 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:43:42,375 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:42,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [220373640] [2021-11-23 17:43:42,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [220373640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:42,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2141524968] [2021-11-23 17:43:42,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:42,375 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:42,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:42,376 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:42,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2021-11-23 17:43:42,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:42,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:42,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:44,608 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:43:44,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:45,150 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:43:45,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2141524968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:45,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22019931] [2021-11-23 17:43:45,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:45,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:45,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:45,152 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:45,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 17:43:45,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:45,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:43:45,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:46,159 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:46,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:47,185 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 55 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:47,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22019931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:47,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:47,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:43:47,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983416392] [2021-11-23 17:43:47,186 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:47,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:43:47,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:47,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:43:47,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:43:47,188 INFO L87 Difference]: Start difference. First operand 2449 states and 2865 transitions. Second operand has 22 states, 22 states have (on average 20.90909090909091) internal successors, (460), 21 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:49,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:49,223 INFO L93 Difference]: Finished difference Result 6221 states and 7280 transitions. [2021-11-23 17:43:49,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:43:49,223 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 20.90909090909091) internal successors, (460), 21 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have 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 17:43:49,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:49,227 INFO L225 Difference]: With dead ends: 6221 [2021-11-23 17:43:49,227 INFO L226 Difference]: Without dead ends: 4044 [2021-11-23 17:43:49,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 911 GetRequests, 880 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=189, Invalid=867, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:43:49,230 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 219 mSDsluCounter, 1135 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 1240 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 206 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:49,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 1240 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 77 Invalid, 0 Unknown, 206 Unchecked, 0.1s Time] [2021-11-23 17:43:49,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4044 states. [2021-11-23 17:43:50,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4044 to 3317. [2021-11-23 17:43:50,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3317 states, 3316 states have (on average 1.1703860072376358) internal successors, (3881), 3316 states have internal predecessors, (3881), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:50,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3317 states to 3317 states and 3881 transitions. [2021-11-23 17:43:50,563 INFO L78 Accepts]: Start accepts. Automaton has 3317 states and 3881 transitions. Word has length 150 [2021-11-23 17:43:50,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:50,564 INFO L470 AbstractCegarLoop]: Abstraction has 3317 states and 3881 transitions. [2021-11-23 17:43:50,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 20.90909090909091) internal successors, (460), 21 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:50,564 INFO L276 IsEmpty]: Start isEmpty. Operand 3317 states and 3881 transitions. [2021-11-23 17:43:50,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-23 17:43:50,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:50,566 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:50,589 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2021-11-23 17:43:50,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Ended with exit code 0 [2021-11-23 17:43:50,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:51,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:43:51,167 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:51,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:51,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1779692350, now seen corresponding path program 1 times [2021-11-23 17:43:51,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:51,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [388769891] [2021-11-23 17:43:51,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:51,168 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:51,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:51,170 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:51,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:43:51,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:51,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:43:51,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:53,149 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 59 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:43:53,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:55,169 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:55,170 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:55,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [388769891] [2021-11-23 17:43:55,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [388769891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:55,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1665979033] [2021-11-23 17:43:55,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:55,170 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:55,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:55,171 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:55,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:43:55,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:55,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:43:55,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:59,600 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 59 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:43:59,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:01,757 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:01,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1665979033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:01,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491271454] [2021-11-23 17:44:01,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:01,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:01,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:01,758 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:01,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:44:01,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:01,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:44:01,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:17,851 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:17,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:20,474 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:20,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491271454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:20,474 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:20,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 22, 19, 22, 31, 17] total 100 [2021-11-23 17:44:20,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816699560] [2021-11-23 17:44:20,475 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:20,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 17:44:20,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:20,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 17:44:20,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1172, Invalid=8728, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:44:20,477 INFO L87 Difference]: Start difference. First operand 3317 states and 3881 transitions. Second operand has 100 states, 100 states have (on average 6.44) internal successors, (644), 100 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:27,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:27,748 INFO L93 Difference]: Finished difference Result 4629 states and 5415 transitions. [2021-11-23 17:44:27,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 17:44:27,749 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 6.44) internal successors, (644), 100 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have 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 17:44:27,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:27,753 INFO L225 Difference]: With dead ends: 4629 [2021-11-23 17:44:27,753 INFO L226 Difference]: Without dead ends: 3656 [2021-11-23 17:44:27,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 812 SyntacticMatches, 3 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5308 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=1763, Invalid=13243, Unknown=0, NotChecked=0, Total=15006 [2021-11-23 17:44:27,755 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 814 mSDsluCounter, 4990 mSDsCounter, 0 mSdLazyCounter, 1133 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 814 SdHoareTripleChecker+Valid, 5092 SdHoareTripleChecker+Invalid, 1811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 651 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:27,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [814 Valid, 5092 Invalid, 1811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1133 Invalid, 0 Unknown, 651 Unchecked, 1.3s Time] [2021-11-23 17:44:27,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3656 states. [2021-11-23 17:44:29,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3656 to 3478. [2021-11-23 17:44:29,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3478 states, 3477 states have (on average 1.165660051768766) internal successors, (4053), 3477 states have internal predecessors, (4053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:29,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3478 states to 3478 states and 4053 transitions. [2021-11-23 17:44:29,227 INFO L78 Accepts]: Start accepts. Automaton has 3478 states and 4053 transitions. Word has length 151 [2021-11-23 17:44:29,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:29,228 INFO L470 AbstractCegarLoop]: Abstraction has 3478 states and 4053 transitions. [2021-11-23 17:44:29,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 6.44) internal successors, (644), 100 states have internal predecessors, (644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:29,228 INFO L276 IsEmpty]: Start isEmpty. Operand 3478 states and 4053 transitions. [2021-11-23 17:44:29,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-23 17:44:29,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:29,230 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:44:29,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:29,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:29,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:29,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:29,835 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:29,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:29,835 INFO L85 PathProgramCache]: Analyzing trace with hash -2042846339, now seen corresponding path program 1 times [2021-11-23 17:44:29,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:29,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1099595788] [2021-11-23 17:44:29,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:29,836 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:29,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:29,837 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:29,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:44:29,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:29,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:44:29,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:32,510 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:32,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:35,481 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:35,481 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:35,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1099595788] [2021-11-23 17:44:35,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1099595788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:35,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1167682147] [2021-11-23 17:44:35,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:35,482 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:35,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:35,483 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:35,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:44:35,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:35,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-23 17:44:35,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:46,386 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 64 proven. 6 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 17:44:46,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:52,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1167682147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:52,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233745132] [2021-11-23 17:44:52,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:52,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:52,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:52,254 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:52,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:44:52,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:52,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:44:52,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 25 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:58,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:02,384 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:02,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233745132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:02,384 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:45:02,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 33, 31, 23, 23] total 137 [2021-11-23 17:45:02,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392906819] [2021-11-23 17:45:02,385 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:45:02,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-23 17:45:02,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:02,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-23 17:45:02,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1452, Invalid=17180, Unknown=0, NotChecked=0, Total=18632 [2021-11-23 17:45:02,387 INFO L87 Difference]: Start difference. First operand 3478 states and 4053 transitions. Second operand has 137 states, 137 states have (on average 4.905109489051095) internal successors, (672), 137 states have internal predecessors, (672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:23,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:23,137 INFO L93 Difference]: Finished difference Result 4970 states and 5752 transitions. [2021-11-23 17:45:23,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-23 17:45:23,138 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 4.905109489051095) internal successors, (672), 137 states have internal predecessors, (672), 0 states have call successors, (0), 0 states have 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 17:45:23,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:23,142 INFO L225 Difference]: With dead ends: 4970 [2021-11-23 17:45:23,143 INFO L226 Difference]: Without dead ends: 4096 [2021-11-23 17:45:23,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 952 GetRequests, 768 SyntacticMatches, 8 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 10491 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=2561, Invalid=28945, Unknown=0, NotChecked=0, Total=31506 [2021-11-23 17:45:23,152 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 1492 mSDsluCounter, 6339 mSDsCounter, 0 mSdLazyCounter, 2021 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1492 SdHoareTripleChecker+Valid, 6484 SdHoareTripleChecker+Invalid, 3657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 2021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1446 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:23,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1492 Valid, 6484 Invalid, 3657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 2021 Invalid, 0 Unknown, 1446 Unchecked, 3.2s Time] [2021-11-23 17:45:23,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4096 states. [2021-11-23 17:45:24,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4096 to 3537. [2021-11-23 17:45:24,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3537 states, 3536 states have (on average 1.164027149321267) internal successors, (4116), 3536 states have internal predecessors, (4116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:24,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3537 states to 3537 states and 4116 transitions. [2021-11-23 17:45:24,716 INFO L78 Accepts]: Start accepts. Automaton has 3537 states and 4116 transitions. Word has length 151 [2021-11-23 17:45:24,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:24,716 INFO L470 AbstractCegarLoop]: Abstraction has 3537 states and 4116 transitions. [2021-11-23 17:45:24,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 4.905109489051095) internal successors, (672), 137 states have internal predecessors, (672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:24,716 INFO L276 IsEmpty]: Start isEmpty. Operand 3537 states and 4116 transitions. [2021-11-23 17:45:24,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-23 17:45:24,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:24,719 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:45:24,743 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2021-11-23 17:45:24,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:25,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:25,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:45:25,320 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:25,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:25,320 INFO L85 PathProgramCache]: Analyzing trace with hash -792685118, now seen corresponding path program 1 times [2021-11-23 17:45:25,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:25,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465230487] [2021-11-23 17:45:25,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:25,321 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:25,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:25,322 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:25,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2021-11-23 17:45:25,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:25,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:45:25,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:28,298 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:28,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:31,155 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:31,156 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:31,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465230487] [2021-11-23 17:45:31,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465230487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:31,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2031814527] [2021-11-23 17:45:31,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:31,156 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:31,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:31,157 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:31,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Waiting until timeout for monitored process [2021-11-23 17:45:31,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:31,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:45:31,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:41,063 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:41,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:44,054 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:44,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2031814527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:44,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934783359] [2021-11-23 17:45:44,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:44,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:44,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:45:44,056 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:45:44,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3227fbac-d50a-43e7-af64-8b412a62a3d5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-23 17:45:44,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:44,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:45:44,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:56,839 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:56,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:01,834 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:01,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934783359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:01,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:46:01,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 20, 19, 29, 24] total 124 [2021-11-23 17:46:01,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100799759] [2021-11-23 17:46:01,835 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:46:01,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-11-23 17:46:01,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:46:01,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-11-23 17:46:01,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=736, Invalid=14516, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 17:46:01,837 INFO L87 Difference]: Start difference. First operand 3537 states and 4116 transitions. Second operand has 124 states, 124 states have (on average 6.137096774193548) internal successors, (761), 124 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)