./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF --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 64bit --witnessprinter.graph.data.programhash 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:01:39,257 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:01:39,259 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:01:39,292 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:01:39,293 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:01:39,294 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:01:39,296 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:01:39,298 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:01:39,300 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:01:39,301 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:01:39,302 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:01:39,304 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:01:39,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:01:39,306 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:01:39,307 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:01:39,309 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:01:39,310 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:01:39,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:01:39,313 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:01:39,316 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:01:39,318 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:01:39,319 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:01:39,320 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:01:39,322 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:01:39,325 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:01:39,326 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:01:39,326 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:01:39,327 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:01:39,328 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:01:39,329 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:01:39,329 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:01:39,330 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:01:39,331 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:01:39,332 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:01:39,333 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:01:39,334 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:01:39,335 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:01:39,335 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:01:39,335 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:01:39,336 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:01:39,337 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:01:39,339 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-12 23:01:39,373 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:01:39,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:01:39,375 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:01:39,375 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:01:39,375 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:01:39,375 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:01:39,376 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:01:39,376 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:01:39,376 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:01:39,376 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:01:39,376 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:01:39,377 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:01:39,377 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:01:39,377 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:01:39,377 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:01:39,377 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:01:39,378 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:01:39,378 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:01:39,379 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:01:39,380 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:01:39,380 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:01:39,380 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:01:39,380 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:01:39,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:01:39,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:01:39,381 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:01:39,381 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:01:39,381 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:01:39,381 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:01:39,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:01:39,382 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:01:39,382 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:01:39,382 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-12 23:01:39,657 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:01:39,694 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:01:39,699 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:01:39,700 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:01:39,701 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:01:39,702 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:01:39,794 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/6969045a6/769dd6bf120d415b9f4ec42ced6265ae/FLAG65a85474b [2021-11-12 23:01:40,616 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:01:40,617 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:01:40,671 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/6969045a6/769dd6bf120d415b9f4ec42ced6265ae/FLAG65a85474b [2021-11-12 23:01:41,097 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/6969045a6/769dd6bf120d415b9f4ec42ced6265ae [2021-11-12 23:01:41,099 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:01:41,101 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:01:41,103 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:01:41,103 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:01:41,106 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:01:41,107 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:01:41" (1/1) ... [2021-11-12 23:01:41,108 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31a18506 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:41, skipping insertion in model container [2021-11-12 23:01:41,108 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:01:41" (1/1) ... [2021-11-12 23:01:41,113 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:01:41,225 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:01:42,386 WARN L228 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i[188986,188999] [2021-11-12 23:01:42,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:01:42,530 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-12 23:01:42,531 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@7a2c7aed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:42, skipping insertion in model container [2021-11-12 23:01:42,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:01:42,532 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-12 23:01:42,534 INFO L158 Benchmark]: Toolchain (without parser) took 1432.11ms. Allocated memory was 109.1MB in the beginning and 161.5MB in the end (delta: 52.4MB). Free memory was 62.3MB in the beginning and 113.3MB in the end (delta: -51.1MB). Peak memory consumption was 15.1MB. Max. memory is 16.1GB. [2021-11-12 23:01:42,535 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 109.1MB. Free memory is still 87.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:01:42,537 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1428.57ms. Allocated memory was 109.1MB in the beginning and 161.5MB in the end (delta: 52.4MB). Free memory was 62.1MB in the beginning and 113.3MB in the end (delta: -51.3MB). Peak memory consumption was 15.1MB. Max. memory is 16.1GB. [2021-11-12 23:01:42,539 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18ms. Allocated memory is still 109.1MB. Free memory is still 87.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1428.57ms. Allocated memory was 109.1MB in the beginning and 161.5MB in the end (delta: 52.4MB). Free memory was 62.1MB in the beginning and 113.3MB in the end (delta: -51.3MB). Peak memory consumption was 15.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 5636]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF --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 64bit --witnessprinter.graph.data.programhash 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:01:44,801 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:01:44,805 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:01:44,861 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:01:44,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:01:44,865 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:01:44,868 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:01:44,872 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:01:44,875 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:01:44,883 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:01:44,884 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:01:44,886 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:01:44,887 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:01:44,889 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:01:44,891 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:01:44,896 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:01:44,897 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:01:44,898 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:01:44,900 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:01:44,908 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:01:44,910 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:01:44,911 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:01:44,914 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:01:44,916 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:01:44,925 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:01:44,926 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:01:44,926 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:01:44,927 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:01:44,927 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:01:44,929 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:01:44,929 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:01:44,930 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:01:44,931 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:01:44,932 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:01:44,932 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:01:44,933 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:01:44,933 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:01:44,933 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:01:44,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:01:44,936 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:01:44,937 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:01:44,940 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-12 23:01:44,988 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:01:44,988 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:01:44,990 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:01:44,990 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:01:44,990 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:01:44,990 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:01:44,991 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:01:44,991 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:01:44,991 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:01:44,991 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:01:44,994 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:01:44,994 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:01:44,994 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:01:44,995 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:01:44,995 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:01:44,995 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:01:44,995 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 23:01:44,995 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 23:01:44,996 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:01:44,996 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:01:44,996 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:01:44,996 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:01:44,997 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 23:01:44,997 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:01:44,997 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:01:44,997 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:01:44,997 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:01:44,998 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:01:44,998 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 23:01:44,998 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 23:01:44,998 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:01:44,999 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:01:44,999 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:01:44,999 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-12 23:01:45,399 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:01:45,424 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:01:45,427 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:01:45,429 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:01:45,429 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:01:45,431 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:01:45,494 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/63bc9cb2e/6a45dc6650ea43ba81a259000db3c6cb/FLAG092e89420 [2021-11-12 23:01:46,383 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:01:46,385 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:01:46,433 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/63bc9cb2e/6a45dc6650ea43ba81a259000db3c6cb/FLAG092e89420 [2021-11-12 23:01:46,862 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/data/63bc9cb2e/6a45dc6650ea43ba81a259000db3c6cb [2021-11-12 23:01:46,866 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:01:46,867 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:01:46,872 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:01:46,873 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:01:46,876 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:01:46,877 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:01:46" (1/1) ... [2021-11-12 23:01:46,880 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@549cfd8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:46, skipping insertion in model container [2021-11-12 23:01:46,880 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:01:46" (1/1) ... [2021-11-12 23:01:46,888 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:01:47,048 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:01:48,469 WARN L228 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i[188986,188999] [2021-11-12 23:01:48,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:01:48,606 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-12 23:01:48,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:01:48,952 WARN L228 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i[188986,188999] [2021-11-12 23:01:48,978 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:01:49,004 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:01:49,300 WARN L228 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_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i[188986,188999] [2021-11-12 23:01:49,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:01:49,447 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:01:49,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49 WrapperNode [2021-11-12 23:01:49,448 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:01:49,450 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:01:49,450 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:01:49,450 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:01:49,458 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,530 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,653 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:01:49,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:01:49,654 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:01:49,654 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:01:49,664 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,678 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,678 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,764 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,799 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,815 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:01:49,816 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:01:49,816 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:01:49,817 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:01:49,817 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (1/1) ... [2021-11-12 23:01:49,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:01:49,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:01:49,856 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:01:49,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:01:49,908 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_set_intfdata_11 [2021-11-12 23:01:49,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_set_intfdata_11 [2021-11-12 23:01:49,909 INFO L130 BoogieDeclarations]: Found specification of procedure __raw_spin_lock_init [2021-11-12 23:01:49,909 INFO L138 BoogieDeclarations]: Found implementation of procedure __raw_spin_lock_init [2021-11-12 23:01:49,909 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_ioctl [2021-11-12 23:01:49,909 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_ioctl [2021-11-12 23:01:49,909 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-12 23:01:49,909 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_fill_bulk_urb_3 [2021-11-12 23:01:49,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_fill_bulk_urb_3 [2021-11-12 23:01:49,910 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_submit_urb_8 [2021-11-12 23:01:49,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_submit_urb_8 [2021-11-12 23:01:49,910 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-12 23:01:49,910 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_close [2021-11-12 23:01:49,911 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_close [2021-11-12 23:01:49,911 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-12 23:01:49,911 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-12 23:01:49,911 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-12 23:01:49,911 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-12 23:01:49,911 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-12 23:01:49,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-12 23:01:49,912 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-12 23:01:49,912 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-12 23:01:49,912 INFO L130 BoogieDeclarations]: Found specification of procedure usb_set_interface [2021-11-12 23:01:49,912 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_set_interface [2021-11-12 23:01:49,912 INFO L130 BoogieDeclarations]: Found specification of procedure free_netdev [2021-11-12 23:01:49,913 INFO L138 BoogieDeclarations]: Found implementation of procedure free_netdev [2021-11-12 23:01:49,913 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_submit_urb [2021-11-12 23:01:49,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_submit_urb [2021-11-12 23:01:49,913 INFO L130 BoogieDeclarations]: Found specification of procedure lowmem_page_address [2021-11-12 23:01:49,913 INFO L138 BoogieDeclarations]: Found implementation of procedure lowmem_page_address [2021-11-12 23:01:49,913 INFO L130 BoogieDeclarations]: Found specification of procedure usb_driver_release_interface [2021-11-12 23:01:49,914 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_driver_release_interface [2021-11-12 23:01:49,914 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2021-11-12 23:01:49,914 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2021-11-12 23:01:49,914 INFO L130 BoogieDeclarations]: Found specification of procedure netif_wake_queue [2021-11-12 23:01:49,915 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_wake_queue [2021-11-12 23:01:49,915 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-12 23:01:49,915 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-12 23:01:49,915 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-12 23:01:49,915 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-12 23:01:49,915 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_alloc_urb [2021-11-12 23:01:49,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_alloc_urb [2021-11-12 23:01:49,916 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_size_call_parameter [2021-11-12 23:01:49,916 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_disconnect [2021-11-12 23:01:49,916 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_disconnect [2021-11-12 23:01:49,916 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_set_mtu [2021-11-12 23:01:49,917 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_set_mtu [2021-11-12 23:01:49,917 INFO L130 BoogieDeclarations]: Found specification of procedure skb_add_rx_frag [2021-11-12 23:01:49,917 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_add_rx_frag [2021-11-12 23:01:49,917 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-12 23:01:49,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-12 23:01:49,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-12 23:01:49,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-12 23:01:49,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-12 23:01:49,921 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-12 23:01:49,922 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-12 23:01:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-12 23:01:49,922 INFO L130 BoogieDeclarations]: Found specification of procedure rx_submit [2021-11-12 23:01:49,922 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_submit [2021-11-12 23:01:49,924 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-12 23:01:49,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-12 23:01:49,924 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 23:01:49,924 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 23:01:49,924 INFO L130 BoogieDeclarations]: Found specification of procedure netif_stop_queue [2021-11-12 23:01:49,924 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_stop_queue [2021-11-12 23:01:49,925 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-12 23:01:49,925 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-12 23:01:49,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-12 23:01:49,930 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2021-11-12 23:01:49,930 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2021-11-12 23:01:49,960 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2021-11-12 23:01:49,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2021-11-12 23:01:49,960 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-12 23:01:49,960 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:01:49,960 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-12 23:01:49,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE8 [2021-11-12 23:01:49,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE2 [2021-11-12 23:01:49,961 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2021-11-12 23:01:49,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2021-11-12 23:01:49,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-12 23:01:49,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-12 23:01:49,962 INFO L130 BoogieDeclarations]: Found specification of procedure put_page [2021-11-12 23:01:49,962 INFO L138 BoogieDeclarations]: Found implementation of procedure put_page [2021-11-12 23:01:49,962 INFO L130 BoogieDeclarations]: Found specification of procedure skb_end_pointer [2021-11-12 23:01:49,962 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_end_pointer [2021-11-12 23:01:49,963 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-11-12 23:01:49,963 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-11-12 23:01:49,964 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-12 23:01:49,964 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-12 23:01:49,964 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-12 23:01:49,964 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 23:01:49,965 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-12 23:01:49,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-12 23:01:49,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 23:01:49,967 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-12 23:01:49,967 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-12 23:01:49,967 INFO L130 BoogieDeclarations]: Found specification of procedure skb_put [2021-11-12 23:01:49,968 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_put [2021-11-12 23:01:49,968 INFO L130 BoogieDeclarations]: Found specification of procedure _raw_spin_lock_irqsave [2021-11-12 23:01:49,968 INFO L138 BoogieDeclarations]: Found implementation of procedure _raw_spin_lock_irqsave [2021-11-12 23:01:49,968 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_priv [2021-11-12 23:01:49,968 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_priv [2021-11-12 23:01:49,968 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_get_tx_queue [2021-11-12 23:01:49,969 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_get_tx_queue [2021-11-12 23:01:49,969 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_free_urb [2021-11-12 23:01:49,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_free_urb [2021-11-12 23:01:49,969 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-12 23:01:49,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:01:49,970 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:01:49,970 INFO L130 BoogieDeclarations]: Found specification of procedure rx_complete [2021-11-12 23:01:49,970 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_complete [2021-11-12 23:01:55,226 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-12 23:02:10,926 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:02:10,926 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 23:02:10,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:02:10 BoogieIcfgContainer [2021-11-12 23:02:10,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:02:10,932 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:02:10,932 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:02:10,935 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:02:10,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:01:46" (1/3) ... [2021-11-12 23:02:10,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b08fae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:02:10, skipping insertion in model container [2021-11-12 23:02:10,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:01:49" (2/3) ... [2021-11-12 23:02:10,937 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42b08fae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:02:10, skipping insertion in model container [2021-11-12 23:02:10,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:02:10" (3/3) ... [2021-11-12 23:02:10,938 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-stable-47dffc7-1-144_2a-drivers--net--usb--cdc-phonet.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:02:10,944 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:02:10,944 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:02:10,996 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:02:11,002 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 [2021-11-12 23:02:11,002 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:02:11,033 INFO L276 IsEmpty]: Start isEmpty. Operand has 598 states, 444 states have (on average 1.3513513513513513) internal successors, (600), 463 states have internal predecessors, (600), 113 states have call successors, (113), 40 states have call predecessors, (113), 39 states have return successors, (107), 105 states have call predecessors, (107), 107 states have call successors, (107) [2021-11-12 23:02:11,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-12 23:02:11,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:11,045 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:11,045 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:11,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:11,051 INFO L85 PathProgramCache]: Analyzing trace with hash 148447644, now seen corresponding path program 1 times [2021-11-12 23:02:11,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:11,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1637291469] [2021-11-12 23:02:11,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:11,069 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:11,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:11,075 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:11,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 23:02:11,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:11,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-12 23:02:11,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:12,176 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-12 23:02:12,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:12,487 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:02:12,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:12,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1637291469] [2021-11-12 23:02:12,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1637291469] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:02:12,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:02:12,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2021-11-12 23:02:12,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386223960] [2021-11-12 23:02:12,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:12,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-12 23:02:12,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:12,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-12 23:02:12,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 23:02:12,536 INFO L87 Difference]: Start difference. First operand has 598 states, 444 states have (on average 1.3513513513513513) internal successors, (600), 463 states have internal predecessors, (600), 113 states have call successors, (113), 40 states have call predecessors, (113), 39 states have return successors, (107), 105 states have call predecessors, (107), 107 states have call successors, (107) Second operand has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 23:02:12,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:12,696 INFO L93 Difference]: Finished difference Result 1191 states and 1659 transitions. [2021-11-12 23:02:12,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-12 23:02:12,700 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 78 [2021-11-12 23:02:12,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:12,726 INFO L225 Difference]: With dead ends: 1191 [2021-11-12 23:02:12,727 INFO L226 Difference]: Without dead ends: 584 [2021-11-12 23:02:12,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 23:02:12,743 INFO L933 BasicCegarLoop]: 812 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.48ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:12,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 812 Invalid, 0 Unknown, 0 Unchecked, 14.48ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 23:02:12,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-11-12 23:02:12,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 584. [2021-11-12 23:02:12,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 584 states, 438 states have (on average 1.3333333333333333) internal successors, (584), 449 states have internal predecessors, (584), 107 states have call successors, (107), 39 states have call predecessors, (107), 38 states have return successors, (102), 100 states have call predecessors, (102), 102 states have call successors, (102) [2021-11-12 23:02:12,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 793 transitions. [2021-11-12 23:02:12,885 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 793 transitions. Word has length 78 [2021-11-12 23:02:12,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:12,886 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 793 transitions. [2021-11-12 23:02:12,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 21.5) internal successors, (43), 2 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 23:02:12,887 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 793 transitions. [2021-11-12 23:02:12,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-12 23:02:12,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:12,892 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:12,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:13,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:02:13,102 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:13,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:13,103 INFO L85 PathProgramCache]: Analyzing trace with hash 354669602, now seen corresponding path program 1 times [2021-11-12 23:02:13,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:13,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1864742556] [2021-11-12 23:02:13,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:13,111 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:13,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:13,113 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:13,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 23:02:13,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:13,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:02:13,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:02:14,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:14,647 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:14,647 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:14,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1864742556] [2021-11-12 23:02:14,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1864742556] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:02:14,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:02:14,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-12 23:02:14,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563706169] [2021-11-12 23:02:14,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:14,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:02:14,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:14,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:02:14,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:02:14,651 INFO L87 Difference]: Start difference. First operand 584 states and 793 transitions. Second operand has 4 states, 4 states have (on average 9.25) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:02:14,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:14,807 INFO L93 Difference]: Finished difference Result 1162 states and 1578 transitions. [2021-11-12 23:02:14,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:02:14,808 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 78 [2021-11-12 23:02:14,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:14,814 INFO L225 Difference]: With dead ends: 1162 [2021-11-12 23:02:14,814 INFO L226 Difference]: Without dead ends: 585 [2021-11-12 23:02:14,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:02:14,818 INFO L933 BasicCegarLoop]: 791 mSDtfsCounter, 3 mSDsluCounter, 1577 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 54.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 2368 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.34ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.14ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:14,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 2368 Invalid, 11 Unknown, 0 Unchecked, 11.34ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 61.14ms Time] [2021-11-12 23:02:14,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-11-12 23:02:14,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 585. [2021-11-12 23:02:14,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 585 states, 439 states have (on average 1.3325740318906605) internal successors, (585), 450 states have internal predecessors, (585), 107 states have call successors, (107), 39 states have call predecessors, (107), 38 states have return successors, (102), 100 states have call predecessors, (102), 102 states have call successors, (102) [2021-11-12 23:02:14,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 585 states to 585 states and 794 transitions. [2021-11-12 23:02:14,862 INFO L78 Accepts]: Start accepts. Automaton has 585 states and 794 transitions. Word has length 78 [2021-11-12 23:02:14,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:14,864 INFO L470 AbstractCegarLoop]: Abstraction has 585 states and 794 transitions. [2021-11-12 23:02:14,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:02:14,864 INFO L276 IsEmpty]: Start isEmpty. Operand 585 states and 794 transitions. [2021-11-12 23:02:14,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-12 23:02:14,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:14,868 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:14,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:15,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:02:15,082 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:15,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:15,082 INFO L85 PathProgramCache]: Analyzing trace with hash -72101774, now seen corresponding path program 1 times [2021-11-12 23:02:15,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:15,084 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [617520004] [2021-11-12 23:02:15,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:15,084 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:15,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:15,089 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:15,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 23:02:15,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:15,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:15,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:16,140 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:16,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:16,745 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 23:02:16,745 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:16,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [617520004] [2021-11-12 23:02:16,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [617520004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:16,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1221254528] [2021-11-12 23:02:16,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:16,747 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:16,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:16,753 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:16,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-12 23:02:17,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:17,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:17,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:17,662 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-12 23:02:17,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:17,934 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-12 23:02:17,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1221254528] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:17,935 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:17,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:02:17,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444226008] [2021-11-12 23:02:17,936 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:17,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:02:17,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:17,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:02:17,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:17,939 INFO L87 Difference]: Start difference. First operand 585 states and 794 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-12 23:02:20,036 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:02:21,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:21,420 INFO L93 Difference]: Finished difference Result 2236 states and 3046 transitions. [2021-11-12 23:02:21,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:02:21,420 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 80 [2021-11-12 23:02:21,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:21,437 INFO L225 Difference]: With dead ends: 2236 [2021-11-12 23:02:21,446 INFO L226 Difference]: Without dead ends: 1670 [2021-11-12 23:02:21,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:21,455 INFO L933 BasicCegarLoop]: 995 mSDtfsCounter, 1510 mSDsluCounter, 2027 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3122.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1510 SdHoareTripleChecker+Valid, 3022 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 23.05ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3322.84ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:21,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1510 Valid, 3022 Invalid, 238 Unknown, 0 Unchecked, 23.05ms Time], IncrementalHoareTripleChecker [7 Valid, 230 Invalid, 1 Unknown, 0 Unchecked, 3322.84ms Time] [2021-11-12 23:02:21,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1670 states. [2021-11-12 23:02:21,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1670 to 1670. [2021-11-12 23:02:21,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1670 states, 1258 states have (on average 1.3346581875993642) internal successors, (1679), 1283 states have internal predecessors, (1679), 299 states have call successors, (299), 113 states have call predecessors, (299), 112 states have return successors, (294), 288 states have call predecessors, (294), 294 states have call successors, (294) [2021-11-12 23:02:21,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 2272 transitions. [2021-11-12 23:02:21,598 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 2272 transitions. Word has length 80 [2021-11-12 23:02:21,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:21,599 INFO L470 AbstractCegarLoop]: Abstraction has 1670 states and 2272 transitions. [2021-11-12 23:02:21,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-12 23:02:21,599 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 2272 transitions. [2021-11-12 23:02:21,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-12 23:02:21,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:21,603 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-12 23:02:21,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:21,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-12 23:02:22,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:22,024 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:22,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:22,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1968189157, now seen corresponding path program 1 times [2021-11-12 23:02:22,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:22,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1958283961] [2021-11-12 23:02:22,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:22,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:22,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:22,032 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:22,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 23:02:22,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:22,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:22,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:23,133 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:23,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:23,698 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:23,698 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:23,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1958283961] [2021-11-12 23:02:23,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1958283961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:23,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1794196970] [2021-11-12 23:02:23,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:23,699 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:23,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:23,700 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:23,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-12 23:02:24,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:24,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:24,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:24,503 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:24,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:24,715 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:24,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1794196970] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:24,716 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:24,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:24,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109475538] [2021-11-12 23:02:24,716 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:24,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:24,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:24,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:24,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:24,718 INFO L87 Difference]: Start difference. First operand 1670 states and 2272 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-12 23:02:24,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:24,927 INFO L93 Difference]: Finished difference Result 1696 states and 2304 transitions. [2021-11-12 23:02:24,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:24,927 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) Word has length 100 [2021-11-12 23:02:24,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:24,942 INFO L225 Difference]: With dead ends: 1696 [2021-11-12 23:02:24,942 INFO L226 Difference]: Without dead ends: 1683 [2021-11-12 23:02:24,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:24,945 INFO L933 BasicCegarLoop]: 808 mSDtfsCounter, 788 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 118.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 788 SdHoareTripleChecker+Valid, 824 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.15ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 140.02ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:24,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [788 Valid, 824 Invalid, 6 Unknown, 0 Unchecked, 4.15ms Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 140.02ms Time] [2021-11-12 23:02:24,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1683 states. [2021-11-12 23:02:25,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1683 to 1670. [2021-11-12 23:02:25,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1670 states, 1258 states have (on average 1.3338632750397457) internal successors, (1678), 1283 states have internal predecessors, (1678), 299 states have call successors, (299), 113 states have call predecessors, (299), 112 states have return successors, (294), 288 states have call predecessors, (294), 294 states have call successors, (294) [2021-11-12 23:02:25,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 2271 transitions. [2021-11-12 23:02:25,049 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 2271 transitions. Word has length 100 [2021-11-12 23:02:25,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:25,050 INFO L470 AbstractCegarLoop]: Abstraction has 1670 states and 2271 transitions. [2021-11-12 23:02:25,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-12 23:02:25,051 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 2271 transitions. [2021-11-12 23:02:25,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-12 23:02:25,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:25,079 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-12 23:02:25,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:25,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:25,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:02:25,481 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:25,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:25,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1910930855, now seen corresponding path program 1 times [2021-11-12 23:02:25,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:25,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [449301678] [2021-11-12 23:02:25,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:25,483 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:25,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:25,484 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:25,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-12 23:02:26,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:26,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:26,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:26,505 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:26,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:27,095 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:27,095 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:27,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [449301678] [2021-11-12 23:02:27,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [449301678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:27,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1797650612] [2021-11-12 23:02:27,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:27,096 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:27,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:27,096 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:27,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-12 23:02:27,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:27,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:02:27,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:29,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:29,534 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:29,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1797650612] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:29,535 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:29,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:02:29,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101003585] [2021-11-12 23:02:29,535 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:29,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:02:29,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:29,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:02:29,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:29,536 INFO L87 Difference]: Start difference. First operand 1670 states and 2271 transitions. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:02:29,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:29,925 INFO L93 Difference]: Finished difference Result 4973 states and 6888 transitions. [2021-11-12 23:02:29,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:02:29,926 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), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 100 [2021-11-12 23:02:29,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:29,955 INFO L225 Difference]: With dead ends: 4973 [2021-11-12 23:02:29,956 INFO L226 Difference]: Without dead ends: 3322 [2021-11-12 23:02:29,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:29,967 INFO L933 BasicCegarLoop]: 1126 mSDtfsCounter, 776 mSDsluCounter, 1510 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 180.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 776 SdHoareTripleChecker+Valid, 2636 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.58ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 202.69ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:29,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [776 Valid, 2636 Invalid, 41 Unknown, 0 Unchecked, 9.58ms Time], IncrementalHoareTripleChecker [13 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 202.69ms Time] [2021-11-12 23:02:29,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3322 states. [2021-11-12 23:02:30,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3322 to 3310. [2021-11-12 23:02:30,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3310 states, 2498 states have (on average 1.33306645316253) internal successors, (3330), 2544 states have internal predecessors, (3330), 588 states have call successors, (588), 224 states have call predecessors, (588), 223 states have return successors, (631), 571 states have call predecessors, (631), 583 states have call successors, (631) [2021-11-12 23:02:30,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3310 states to 3310 states and 4549 transitions. [2021-11-12 23:02:30,205 INFO L78 Accepts]: Start accepts. Automaton has 3310 states and 4549 transitions. Word has length 100 [2021-11-12 23:02:30,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:30,206 INFO L470 AbstractCegarLoop]: Abstraction has 3310 states and 4549 transitions. [2021-11-12 23:02:30,207 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), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:02:30,207 INFO L276 IsEmpty]: Start isEmpty. Operand 3310 states and 4549 transitions. [2021-11-12 23:02:30,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-12 23:02:30,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:30,209 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:30,216 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-11-12 23:02:30,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-12 23:02:30,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:02:30,615 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:30,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:30,616 INFO L85 PathProgramCache]: Analyzing trace with hash 890453729, now seen corresponding path program 1 times [2021-11-12 23:02:30,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:30,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1955296739] [2021-11-12 23:02:30,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:30,617 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:30,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:30,618 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:30,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 23:02:31,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:31,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:31,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:31,547 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:31,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:32,081 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:32,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:32,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1955296739] [2021-11-12 23:02:32,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1955296739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:32,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [778118560] [2021-11-12 23:02:32,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:32,082 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:32,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:32,086 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:32,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 23:02:32,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:32,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:02:32,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:34,017 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:34,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:34,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [778118560] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:34,503 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:34,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:02:34,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413114192] [2021-11-12 23:02:34,503 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:34,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:02:34,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:34,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:02:34,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:34,505 INFO L87 Difference]: Start difference. First operand 3310 states and 4549 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:02:34,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:34,675 INFO L93 Difference]: Finished difference Result 3312 states and 4550 transitions. [2021-11-12 23:02:34,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:34,676 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), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 101 [2021-11-12 23:02:34,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:34,700 INFO L225 Difference]: With dead ends: 3312 [2021-11-12 23:02:34,700 INFO L226 Difference]: Without dead ends: 3309 [2021-11-12 23:02:34,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:02:34,704 INFO L933 BasicCegarLoop]: 790 mSDtfsCounter, 751 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 751 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.63ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:34,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [751 Valid, 790 Invalid, 11 Unknown, 0 Unchecked, 3.63ms Time], IncrementalHoareTripleChecker [10 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 27.63ms Time] [2021-11-12 23:02:34,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3309 states. [2021-11-12 23:02:34,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3309 to 3309. [2021-11-12 23:02:34,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3309 states, 2498 states have (on average 1.332666132906325) internal successors, (3329), 2543 states have internal predecessors, (3329), 587 states have call successors, (587), 224 states have call predecessors, (587), 223 states have return successors, (631), 571 states have call predecessors, (631), 583 states have call successors, (631) [2021-11-12 23:02:34,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3309 states to 3309 states and 4547 transitions. [2021-11-12 23:02:34,939 INFO L78 Accepts]: Start accepts. Automaton has 3309 states and 4547 transitions. Word has length 101 [2021-11-12 23:02:34,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:34,939 INFO L470 AbstractCegarLoop]: Abstraction has 3309 states and 4547 transitions. [2021-11-12 23:02:34,940 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), 4 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:02:34,940 INFO L276 IsEmpty]: Start isEmpty. Operand 3309 states and 4547 transitions. [2021-11-12 23:02:34,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-12 23:02:34,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:34,942 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:34,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:35,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:35,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:35,360 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:35,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:35,360 INFO L85 PathProgramCache]: Analyzing trace with hash 1834034780, now seen corresponding path program 1 times [2021-11-12 23:02:35,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:35,361 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1881817639] [2021-11-12 23:02:35,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:35,361 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:35,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:35,364 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:35,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-12 23:02:35,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:35,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 705 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:35,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:36,248 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:36,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:36,812 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:36,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:36,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1881817639] [2021-11-12 23:02:36,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1881817639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:36,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [146765352] [2021-11-12 23:02:36,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:36,813 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:36,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:36,814 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:36,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-12 23:02:37,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:37,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 705 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:37,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:37,937 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:37,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:38,345 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:38,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [146765352] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:38,345 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:38,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:38,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222858319] [2021-11-12 23:02:38,346 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:38,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:38,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:38,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:38,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:38,348 INFO L87 Difference]: Start difference. First operand 3309 states and 4547 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:38,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:38,487 INFO L93 Difference]: Finished difference Result 3311 states and 4548 transitions. [2021-11-12 23:02:38,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:38,488 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 102 [2021-11-12 23:02:38,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:38,512 INFO L225 Difference]: With dead ends: 3311 [2021-11-12 23:02:38,512 INFO L226 Difference]: Without dead ends: 3308 [2021-11-12 23:02:38,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:38,516 INFO L933 BasicCegarLoop]: 788 mSDtfsCounter, 734 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 734 SdHoareTripleChecker+Valid, 788 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.89ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.74ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:38,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [734 Valid, 788 Invalid, 1 Unknown, 0 Unchecked, 2.89ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 2.74ms Time] [2021-11-12 23:02:38,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3308 states. [2021-11-12 23:02:38,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3308 to 3308. [2021-11-12 23:02:38,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3308 states, 2498 states have (on average 1.3322658126501201) internal successors, (3328), 2542 states have internal predecessors, (3328), 586 states have call successors, (586), 224 states have call predecessors, (586), 223 states have return successors, (631), 571 states have call predecessors, (631), 583 states have call successors, (631) [2021-11-12 23:02:38,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3308 states to 3308 states and 4545 transitions. [2021-11-12 23:02:38,781 INFO L78 Accepts]: Start accepts. Automaton has 3308 states and 4545 transitions. Word has length 102 [2021-11-12 23:02:38,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:38,782 INFO L470 AbstractCegarLoop]: Abstraction has 3308 states and 4545 transitions. [2021-11-12 23:02:38,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:38,782 INFO L276 IsEmpty]: Start isEmpty. Operand 3308 states and 4545 transitions. [2021-11-12 23:02:38,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-12 23:02:38,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:38,785 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:38,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:39,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:39,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:39,207 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:39,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:39,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1020281156, now seen corresponding path program 1 times [2021-11-12 23:02:39,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:39,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [976686579] [2021-11-12 23:02:39,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:39,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:39,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:39,209 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:39,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-12 23:02:39,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:39,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:39,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:40,078 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:40,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:40,603 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:40,603 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:40,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [976686579] [2021-11-12 23:02:40,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [976686579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:40,604 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [115465926] [2021-11-12 23:02:40,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:40,604 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:40,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:40,610 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:40,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-12 23:02:41,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:41,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:41,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:41,845 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:41,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:42,183 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:42,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [115465926] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:42,184 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:42,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:42,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716068354] [2021-11-12 23:02:42,184 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:42,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:42,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:42,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:42,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:42,186 INFO L87 Difference]: Start difference. First operand 3308 states and 4545 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:42,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:42,361 INFO L93 Difference]: Finished difference Result 3310 states and 4546 transitions. [2021-11-12 23:02:42,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:42,362 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 103 [2021-11-12 23:02:42,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:42,386 INFO L225 Difference]: With dead ends: 3310 [2021-11-12 23:02:42,387 INFO L226 Difference]: Without dead ends: 3307 [2021-11-12 23:02:42,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:42,390 INFO L933 BasicCegarLoop]: 786 mSDtfsCounter, 731 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 731 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.06ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.70ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:42,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [731 Valid, 786 Invalid, 1 Unknown, 0 Unchecked, 3.06ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 2.70ms Time] [2021-11-12 23:02:42,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3307 states. [2021-11-12 23:02:42,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3307 to 3307. [2021-11-12 23:02:42,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3307 states, 2498 states have (on average 1.331865492393915) internal successors, (3327), 2541 states have internal predecessors, (3327), 585 states have call successors, (585), 224 states have call predecessors, (585), 223 states have return successors, (631), 571 states have call predecessors, (631), 583 states have call successors, (631) [2021-11-12 23:02:42,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3307 states to 3307 states and 4543 transitions. [2021-11-12 23:02:42,656 INFO L78 Accepts]: Start accepts. Automaton has 3307 states and 4543 transitions. Word has length 103 [2021-11-12 23:02:42,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:42,657 INFO L470 AbstractCegarLoop]: Abstraction has 3307 states and 4543 transitions. [2021-11-12 23:02:42,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:42,658 INFO L276 IsEmpty]: Start isEmpty. Operand 3307 states and 4543 transitions. [2021-11-12 23:02:42,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-12 23:02:42,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:42,662 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:42,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:42,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:43,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:43,084 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:43,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:43,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1563727455, now seen corresponding path program 1 times [2021-11-12 23:02:43,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:43,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1386516563] [2021-11-12 23:02:43,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:43,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:43,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:43,087 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:43,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 23:02:43,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:43,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:43,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:43,940 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:02:43,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:44,438 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-12 23:02:44,438 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:44,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1386516563] [2021-11-12 23:02:44,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1386516563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:44,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1959680760] [2021-11-12 23:02:44,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:44,439 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:44,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:44,440 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:44,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 23:02:44,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:44,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:44,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:45,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:45,851 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:45,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1959680760] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:45,852 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:45,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:45,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389823559] [2021-11-12 23:02:45,852 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:45,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:45,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:45,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:45,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:45,853 INFO L87 Difference]: Start difference. First operand 3307 states and 4543 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:46,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:46,014 INFO L93 Difference]: Finished difference Result 3309 states and 4544 transitions. [2021-11-12 23:02:46,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:46,014 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 104 [2021-11-12 23:02:46,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:46,037 INFO L225 Difference]: With dead ends: 3309 [2021-11-12 23:02:46,038 INFO L226 Difference]: Without dead ends: 3297 [2021-11-12 23:02:46,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:46,040 INFO L933 BasicCegarLoop]: 785 mSDtfsCounter, 728 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 728 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.88ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:46,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [728 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 2.88ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 23:02:46,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3297 states. [2021-11-12 23:02:46,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3297 to 3297. [2021-11-12 23:02:46,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3297 states, 2489 states have (on average 1.331860184813178) internal successors, (3315), 2531 states have internal predecessors, (3315), 584 states have call successors, (584), 224 states have call predecessors, (584), 223 states have return successors, (631), 571 states have call predecessors, (631), 583 states have call successors, (631) [2021-11-12 23:02:46,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3297 states to 3297 states and 4530 transitions. [2021-11-12 23:02:46,270 INFO L78 Accepts]: Start accepts. Automaton has 3297 states and 4530 transitions. Word has length 104 [2021-11-12 23:02:46,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:46,271 INFO L470 AbstractCegarLoop]: Abstraction has 3297 states and 4530 transitions. [2021-11-12 23:02:46,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:02:46,271 INFO L276 IsEmpty]: Start isEmpty. Operand 3297 states and 4530 transitions. [2021-11-12 23:02:46,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-12 23:02:46,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:46,279 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-12 23:02:46,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:46,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:46,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:02:46,692 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:46,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:46,693 INFO L85 PathProgramCache]: Analyzing trace with hash 824528998, now seen corresponding path program 1 times [2021-11-12 23:02:46,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:46,694 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1700551154] [2021-11-12 23:02:46,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:46,694 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:46,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:46,695 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:46,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-12 23:02:47,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:47,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 814 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:47,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:47,746 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:02:47,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:48,407 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2021-11-12 23:02:48,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:48,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1700551154] [2021-11-12 23:02:48,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1700551154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:48,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1082854214] [2021-11-12 23:02:48,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:48,408 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:48,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:48,408 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:48,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-12 23:02:48,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:48,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 814 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:48,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:49,289 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-12 23:02:49,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:49,709 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:02:49,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1082854214] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:49,709 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:49,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:49,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356797665] [2021-11-12 23:02:49,713 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:49,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:49,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:49,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:49,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:49,715 INFO L87 Difference]: Start difference. First operand 3297 states and 4530 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 23:02:50,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:50,326 INFO L93 Difference]: Finished difference Result 9403 states and 12939 transitions. [2021-11-12 23:02:50,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:50,328 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), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 141 [2021-11-12 23:02:50,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:50,381 INFO L225 Difference]: With dead ends: 9403 [2021-11-12 23:02:50,382 INFO L226 Difference]: Without dead ends: 6125 [2021-11-12 23:02:50,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 553 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:50,394 INFO L933 BasicCegarLoop]: 1270 mSDtfsCounter, 673 mSDsluCounter, 721 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 231.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 1991 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.46ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 267.59ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:50,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [673 Valid, 1991 Invalid, 41 Unknown, 0 Unchecked, 6.46ms Time], IncrementalHoareTripleChecker [6 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 267.59ms Time] [2021-11-12 23:02:50,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6125 states. [2021-11-12 23:02:50,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6125 to 6057. [2021-11-12 23:02:50,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6057 states, 4563 states have (on average 1.3276353276353277) internal successors, (6058), 4665 states have internal predecessors, (6058), 1066 states have call successors, (1066), 428 states have call predecessors, (1066), 427 states have return successors, (1236), 1017 states have call predecessors, (1236), 1065 states have call successors, (1236) [2021-11-12 23:02:50,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6057 states to 6057 states and 8360 transitions. [2021-11-12 23:02:50,854 INFO L78 Accepts]: Start accepts. Automaton has 6057 states and 8360 transitions. Word has length 141 [2021-11-12 23:02:50,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:50,855 INFO L470 AbstractCegarLoop]: Abstraction has 6057 states and 8360 transitions. [2021-11-12 23:02:50,855 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), 2 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-12 23:02:50,855 INFO L276 IsEmpty]: Start isEmpty. Operand 6057 states and 8360 transitions. [2021-11-12 23:02:50,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-11-12 23:02:50,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:50,866 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:50,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:51,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-12 23:02:51,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:51,291 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:02:51,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:02:51,291 INFO L85 PathProgramCache]: Analyzing trace with hash -414372010, now seen corresponding path program 1 times [2021-11-12 23:02:51,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:02:51,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1432615784] [2021-11-12 23:02:51,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:51,293 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:02:51,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:02:51,293 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:02:51,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-12 23:02:52,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:52,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 1232 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:02:52,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:53,104 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-12 23:02:53,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:53,990 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 185 trivial. 0 not checked. [2021-11-12 23:02:53,991 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:02:53,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1432615784] [2021-11-12 23:02:53,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1432615784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:02:53,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1663124941] [2021-11-12 23:02:53,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:02:53,992 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:02:53,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:02:53,993 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:02:53,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-12 23:02:54,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:02:54,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 1232 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:02:54,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:02:55,479 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-12 23:02:55,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:02:56,146 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-12 23:02:56,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1663124941] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:02:56,146 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:02:56,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:02:56,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597705136] [2021-11-12 23:02:56,147 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:02:56,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:02:56,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:02:56,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:02:56,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:56,149 INFO L87 Difference]: Start difference. First operand 6057 states and 8360 transitions. Second operand has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 2 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (47), 2 states have call predecessors, (47), 2 states have call successors, (47) [2021-11-12 23:02:58,255 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:02:58,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:02:58,909 INFO L93 Difference]: Finished difference Result 16991 states and 23424 transitions. [2021-11-12 23:02:58,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:02:58,909 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 2 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (47), 2 states have call predecessors, (47), 2 states have call successors, (47) Word has length 256 [2021-11-12 23:02:58,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:02:58,979 INFO L225 Difference]: With dead ends: 16991 [2021-11-12 23:02:58,979 INFO L226 Difference]: Without dead ends: 10963 [2021-11-12 23:02:59,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1020 GetRequests, 1013 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:02:59,007 INFO L933 BasicCegarLoop]: 1008 mSDtfsCounter, 633 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2098.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 1754 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.73ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2137.08ms IncrementalHoareTripleChecker+Time [2021-11-12 23:02:59,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 1754 Invalid, 13 Unknown, 0 Unchecked, 5.73ms Time], IncrementalHoareTripleChecker [4 Valid, 8 Invalid, 1 Unknown, 0 Unchecked, 2137.08ms Time] [2021-11-12 23:02:59,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10963 states. [2021-11-12 23:02:59,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10963 to 10904. [2021-11-12 23:02:59,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10904 states, 8234 states have (on average 1.3271799854262814) internal successors, (10928), 8414 states have internal predecessors, (10928), 1876 states have call successors, (1876), 794 states have call predecessors, (1876), 793 states have return successors, (2211), 1797 states have call predecessors, (2211), 1875 states have call successors, (2211) [2021-11-12 23:02:59,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10904 states to 10904 states and 15015 transitions. [2021-11-12 23:02:59,866 INFO L78 Accepts]: Start accepts. Automaton has 10904 states and 15015 transitions. Word has length 256 [2021-11-12 23:02:59,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:02:59,867 INFO L470 AbstractCegarLoop]: Abstraction has 10904 states and 15015 transitions. [2021-11-12 23:02:59,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.333333333333336) internal successors, (163), 3 states have internal predecessors, (163), 2 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (47), 2 states have call predecessors, (47), 2 states have call successors, (47) [2021-11-12 23:02:59,867 INFO L276 IsEmpty]: Start isEmpty. Operand 10904 states and 15015 transitions. [2021-11-12 23:02:59,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-12 23:02:59,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:02:59,891 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:02:59,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:00,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:00,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:00,306 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:03:00,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:03:00,306 INFO L85 PathProgramCache]: Analyzing trace with hash 698212048, now seen corresponding path program 1 times [2021-11-12 23:03:00,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:03:00,307 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [144612770] [2021-11-12 23:03:00,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:00,307 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:03:00,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:03:00,310 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:03:00,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 23:03:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:01,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 1254 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:03:01,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-12 23:03:02,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:03,188 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2021-11-12 23:03:03,188 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:03:03,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [144612770] [2021-11-12 23:03:03,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [144612770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:03,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2005311708] [2021-11-12 23:03:03,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:03,190 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:03,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:03:03,194 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:03:03,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-12 23:03:03,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:03,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 1254 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:03:03,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:04,575 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-11-12 23:03:04,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:05,180 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2021-11-12 23:03:05,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2005311708] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:03:05,180 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:03:05,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:03:05,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576282236] [2021-11-12 23:03:05,181 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:03:05,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:03:05,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:05,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:03:05,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:03:05,183 INFO L87 Difference]: Start difference. First operand 10904 states and 15015 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (45), 2 states have call predecessors, (45), 2 states have call successors, (45) [2021-11-12 23:03:07,204 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:09,270 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:09,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:03:09,992 INFO L93 Difference]: Finished difference Result 23722 states and 33178 transitions. [2021-11-12 23:03:10,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:03:10,009 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (45), 2 states have call predecessors, (45), 2 states have call successors, (45) Word has length 265 [2021-11-12 23:03:10,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:03:10,082 INFO L225 Difference]: With dead ends: 23722 [2021-11-12 23:03:10,082 INFO L226 Difference]: Without dead ends: 12847 [2021-11-12 23:03:10,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1056 GetRequests, 1049 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:03:10,124 INFO L933 BasicCegarLoop]: 945 mSDtfsCounter, 153 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4048.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1742 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.53ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4072.33ms IncrementalHoareTripleChecker+Time [2021-11-12 23:03:10,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 1742 Invalid, 6 Unknown, 0 Unchecked, 4.53ms Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 2 Unknown, 0 Unchecked, 4072.33ms Time] [2021-11-12 23:03:10,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12847 states. [2021-11-12 23:03:10,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12847 to 11024. [2021-11-12 23:03:10,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11024 states, 8354 states have (on average 1.3310988747905195) internal successors, (11120), 8534 states have internal predecessors, (11120), 1876 states have call successors, (1876), 794 states have call predecessors, (1876), 793 states have return successors, (2211), 1797 states have call predecessors, (2211), 1875 states have call successors, (2211) [2021-11-12 23:03:11,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11024 states to 11024 states and 15207 transitions. [2021-11-12 23:03:11,010 INFO L78 Accepts]: Start accepts. Automaton has 11024 states and 15207 transitions. Word has length 265 [2021-11-12 23:03:11,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:03:11,010 INFO L470 AbstractCegarLoop]: Abstraction has 11024 states and 15207 transitions. [2021-11-12 23:03:11,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 2 states have call successors, (46), 2 states have call predecessors, (46), 2 states have return successors, (45), 2 states have call predecessors, (45), 2 states have call successors, (45) [2021-11-12 23:03:11,011 INFO L276 IsEmpty]: Start isEmpty. Operand 11024 states and 15207 transitions. [2021-11-12 23:03:11,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2021-11-12 23:03:11,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:03:11,026 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:03:11,060 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-11-12 23:03:11,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:11,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:11,450 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:03:11,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:03:11,450 INFO L85 PathProgramCache]: Analyzing trace with hash -998464280, now seen corresponding path program 1 times [2021-11-12 23:03:11,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:03:11,451 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [250288125] [2021-11-12 23:03:11,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:11,451 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:03:11,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:03:11,452 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:03:11,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-12 23:03:12,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:12,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:03:12,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:13,292 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-12 23:03:13,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:14,230 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-12 23:03:14,230 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:03:14,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [250288125] [2021-11-12 23:03:14,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [250288125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:14,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1742729839] [2021-11-12 23:03:14,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:14,231 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:14,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:03:14,232 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:03:14,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-12 23:03:14,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:14,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:03:14,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:15,599 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-12 23:03:15,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:16,217 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-12 23:03:16,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1742729839] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:03:16,217 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:03:16,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:03:16,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88019690] [2021-11-12 23:03:16,218 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:03:16,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:03:16,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:16,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:03:16,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:03:16,220 INFO L87 Difference]: Start difference. First operand 11024 states and 15207 transitions. Second operand has 4 states, 4 states have (on average 47.5) internal successors, (190), 4 states have internal predecessors, (190), 4 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 4 states have call predecessors, (34), 4 states have call successors, (34) [2021-11-12 23:03:18,297 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:20,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:03:20,384 INFO L93 Difference]: Finished difference Result 28471 states and 39269 transitions. [2021-11-12 23:03:20,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:03:20,385 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 47.5) internal successors, (190), 4 states have internal predecessors, (190), 4 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 4 states have call predecessors, (34), 4 states have call successors, (34) Word has length 272 [2021-11-12 23:03:20,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:03:20,459 INFO L225 Difference]: With dead ends: 28471 [2021-11-12 23:03:20,459 INFO L226 Difference]: Without dead ends: 17476 [2021-11-12 23:03:20,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1084 GetRequests, 1076 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:03:20,495 INFO L933 BasicCegarLoop]: 1123 mSDtfsCounter, 908 mSDsluCounter, 1392 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3059.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 908 SdHoareTripleChecker+Valid, 2515 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.73ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3218.94ms IncrementalHoareTripleChecker+Time [2021-11-12 23:03:20,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [908 Valid, 2515 Invalid, 293 Unknown, 0 Unchecked, 9.73ms Time], IncrementalHoareTripleChecker [41 Valid, 251 Invalid, 1 Unknown, 0 Unchecked, 3218.94ms Time] [2021-11-12 23:03:20,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17476 states. [2021-11-12 23:03:21,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17476 to 17238. [2021-11-12 23:03:21,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17238 states, 13257 states have (on average 1.3371803575469563) internal successors, (17727), 13521 states have internal predecessors, (17727), 2710 states have call successors, (2710), 1271 states have call predecessors, (2710), 1270 states have return successors, (3225), 2583 states have call predecessors, (3225), 2709 states have call successors, (3225) [2021-11-12 23:03:21,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17238 states to 17238 states and 23662 transitions. [2021-11-12 23:03:21,610 INFO L78 Accepts]: Start accepts. Automaton has 17238 states and 23662 transitions. Word has length 272 [2021-11-12 23:03:21,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:03:21,611 INFO L470 AbstractCegarLoop]: Abstraction has 17238 states and 23662 transitions. [2021-11-12 23:03:21,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 47.5) internal successors, (190), 4 states have internal predecessors, (190), 4 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 4 states have call predecessors, (34), 4 states have call successors, (34) [2021-11-12 23:03:21,611 INFO L276 IsEmpty]: Start isEmpty. Operand 17238 states and 23662 transitions. [2021-11-12 23:03:21,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-12 23:03:21,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:03:21,632 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:03:21,638 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-11-12 23:03:21,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:22,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:03:22,047 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:03:22,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:03:22,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1128427979, now seen corresponding path program 1 times [2021-11-12 23:03:22,051 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:03:22,051 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [480835490] [2021-11-12 23:03:22,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:22,051 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:03:22,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:03:22,052 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:03:22,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-12 23:03:23,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:23,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:03:23,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:24,172 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-12 23:03:24,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:25,259 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-12 23:03:25,260 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:03:25,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [480835490] [2021-11-12 23:03:25,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [480835490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:25,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [100945390] [2021-11-12 23:03:25,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:25,261 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:25,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:03:25,269 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:03:25,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-12 23:03:25,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:25,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:03:25,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:26,624 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-12 23:03:26,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-12 23:03:27,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [100945390] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:03:27,253 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:03:27,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-12 23:03:27,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653836088] [2021-11-12 23:03:27,255 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:03:27,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:03:27,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:27,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:03:27,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:03:27,257 INFO L87 Difference]: Start difference. First operand 17238 states and 23662 transitions. Second operand has 4 states, 4 states have (on average 42.5) internal successors, (170), 4 states have internal predecessors, (170), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:03:29,399 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:31,190 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:32,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:03:32,950 INFO L93 Difference]: Finished difference Result 54385 states and 75276 transitions. [2021-11-12 23:03:32,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:03:32,951 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 42.5) internal successors, (170), 4 states have internal predecessors, (170), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) Word has length 309 [2021-11-12 23:03:32,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:03:33,150 INFO L225 Difference]: With dead ends: 54385 [2021-11-12 23:03:33,150 INFO L226 Difference]: Without dead ends: 37180 [2021-11-12 23:03:33,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1234 GetRequests, 1225 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:03:33,203 INFO L933 BasicCegarLoop]: 938 mSDtfsCounter, 1021 mSDsluCounter, 1694 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 47 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3859.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1021 SdHoareTripleChecker+Valid, 2632 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.78ms SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3955.91ms IncrementalHoareTripleChecker+Time [2021-11-12 23:03:33,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1021 Valid, 2632 Invalid, 85 Unknown, 0 Unchecked, 8.78ms Time], IncrementalHoareTripleChecker [47 Valid, 37 Invalid, 1 Unknown, 0 Unchecked, 3955.91ms Time] [2021-11-12 23:03:33,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37180 states. [2021-11-12 23:03:34,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37180 to 17250. [2021-11-12 23:03:34,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17250 states, 13269 states have (on average 1.336875423920416) internal successors, (17739), 13533 states have internal predecessors, (17739), 2710 states have call successors, (2710), 1271 states have call predecessors, (2710), 1270 states have return successors, (3225), 2583 states have call predecessors, (3225), 2709 states have call successors, (3225) [2021-11-12 23:03:34,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17250 states to 17250 states and 23674 transitions. [2021-11-12 23:03:34,888 INFO L78 Accepts]: Start accepts. Automaton has 17250 states and 23674 transitions. Word has length 309 [2021-11-12 23:03:34,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:03:34,889 INFO L470 AbstractCegarLoop]: Abstraction has 17250 states and 23674 transitions. [2021-11-12 23:03:34,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 42.5) internal successors, (170), 4 states have internal predecessors, (170), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:03:34,889 INFO L276 IsEmpty]: Start isEmpty. Operand 17250 states and 23674 transitions. [2021-11-12 23:03:34,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-12 23:03:34,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:03:34,915 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:03:34,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:35,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:35,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:03:35,330 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:03:35,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:03:35,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1156928269, now seen corresponding path program 1 times [2021-11-12 23:03:35,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:03:35,333 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [782217511] [2021-11-12 23:03:35,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:35,333 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:03:35,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:03:35,335 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:03:35,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-12 23:03:36,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:36,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:03:36,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:37,488 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-12 23:03:37,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-12 23:03:38,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:03:38,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [782217511] [2021-11-12 23:03:38,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [782217511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:38,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1860395888] [2021-11-12 23:03:38,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:38,567 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:38,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:03:38,568 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:03:38,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-12 23:03:39,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:39,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:03:39,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:40,034 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2021-11-12 23:03:40,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:40,559 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-12 23:03:40,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1860395888] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:03:40,559 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:03:40,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-12 23:03:40,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386923872] [2021-11-12 23:03:40,560 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:03:40,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:03:40,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:40,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:03:40,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:03:40,561 INFO L87 Difference]: Start difference. First operand 17250 states and 23674 transitions. Second operand has 4 states, 4 states have (on average 43.75) internal successors, (175), 4 states have internal predecessors, (175), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:03:42,628 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:44,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:03:44,212 INFO L93 Difference]: Finished difference Result 48843 states and 67282 transitions. [2021-11-12 23:03:44,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:03:44,213 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 43.75) internal successors, (175), 4 states have internal predecessors, (175), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 309 [2021-11-12 23:03:44,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:03:44,353 INFO L225 Difference]: With dead ends: 48843 [2021-11-12 23:03:44,354 INFO L226 Difference]: Without dead ends: 31626 [2021-11-12 23:03:44,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1234 GetRequests, 1225 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:03:44,399 INFO L933 BasicCegarLoop]: 1482 mSDtfsCounter, 1053 mSDsluCounter, 2250 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 52 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2221.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1053 SdHoareTripleChecker+Valid, 3732 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.39ms SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2270.80ms IncrementalHoareTripleChecker+Time [2021-11-12 23:03:44,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1053 Valid, 3732 Invalid, 89 Unknown, 0 Unchecked, 7.39ms Time], IncrementalHoareTripleChecker [52 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2270.80ms Time] [2021-11-12 23:03:44,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31626 states. [2021-11-12 23:03:46,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31626 to 28869. [2021-11-12 23:03:46,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28869 states, 22238 states have (on average 1.3349222052342837) internal successors, (29686), 22732 states have internal predecessors, (29686), 4488 states have call successors, (4488), 2143 states have call predecessors, (4488), 2142 states have return successors, (5297), 4209 states have call predecessors, (5297), 4487 states have call successors, (5297) [2021-11-12 23:03:46,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28869 states to 28869 states and 39471 transitions. [2021-11-12 23:03:46,405 INFO L78 Accepts]: Start accepts. Automaton has 28869 states and 39471 transitions. Word has length 309 [2021-11-12 23:03:46,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:03:46,406 INFO L470 AbstractCegarLoop]: Abstraction has 28869 states and 39471 transitions. [2021-11-12 23:03:46,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 43.75) internal successors, (175), 4 states have internal predecessors, (175), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:03:46,407 INFO L276 IsEmpty]: Start isEmpty. Operand 28869 states and 39471 transitions. [2021-11-12 23:03:46,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2021-11-12 23:03:46,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:03:46,438 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:03:46,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:46,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-12 23:03:46,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:46,854 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:03:46,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:03:46,854 INFO L85 PathProgramCache]: Analyzing trace with hash 1116949080, now seen corresponding path program 1 times [2021-11-12 23:03:46,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:03:46,856 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [181921644] [2021-11-12 23:03:46,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:46,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:03:46,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:03:46,858 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:03:46,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-12 23:03:47,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:47,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:03:47,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:48,947 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-12 23:03:48,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:50,066 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-12 23:03:50,066 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:03:50,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [181921644] [2021-11-12 23:03:50,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [181921644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:50,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1991440630] [2021-11-12 23:03:50,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:03:50,067 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:03:50,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:03:50,068 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:03:50,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-12 23:03:50,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:03:50,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:03:50,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:03:52,011 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 167 trivial. 0 not checked. [2021-11-12 23:03:52,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:53,113 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2021-11-12 23:03:53,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1991440630] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:03:53,114 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:03:53,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5, 5] total 14 [2021-11-12 23:03:53,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027656399] [2021-11-12 23:03:53,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:03:53,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:03:53,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:53,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:03:53,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:03:53,117 INFO L87 Difference]: Start difference. First operand 28869 states and 39471 transitions. Second operand has 5 states, 5 states have (on average 35.6) internal successors, (178), 4 states have internal predecessors, (178), 2 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:03:55,135 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:57,149 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:03:58,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:03:58,553 INFO L93 Difference]: Finished difference Result 57933 states and 79427 transitions. [2021-11-12 23:03:58,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:03:58,554 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 35.6) internal successors, (178), 4 states have internal predecessors, (178), 2 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) Word has length 325 [2021-11-12 23:03:58,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:03:58,736 INFO L225 Difference]: With dead ends: 57933 [2021-11-12 23:03:58,736 INFO L226 Difference]: Without dead ends: 29013 [2021-11-12 23:03:58,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1296 GetRequests, 1284 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:03:58,801 INFO L933 BasicCegarLoop]: 780 mSDtfsCounter, 0 mSDsluCounter, 2334 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4032.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3114 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.75ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4064.19ms IncrementalHoareTripleChecker+Time [2021-11-12 23:03:58,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3114 Invalid, 9 Unknown, 0 Unchecked, 5.75ms Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 2 Unknown, 0 Unchecked, 4064.19ms Time] [2021-11-12 23:03:58,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29013 states. [2021-11-12 23:04:00,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29013 to 28953. [2021-11-12 23:04:00,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28953 states, 22280 states have (on average 1.334290843806104) internal successors, (29728), 22816 states have internal predecessors, (29728), 4488 states have call successors, (4488), 2143 states have call predecessors, (4488), 2184 states have return successors, (5501), 4209 states have call predecessors, (5501), 4487 states have call successors, (5501) [2021-11-12 23:04:00,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28953 states to 28953 states and 39717 transitions. [2021-11-12 23:04:00,746 INFO L78 Accepts]: Start accepts. Automaton has 28953 states and 39717 transitions. Word has length 325 [2021-11-12 23:04:00,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:04:00,747 INFO L470 AbstractCegarLoop]: Abstraction has 28953 states and 39717 transitions. [2021-11-12 23:04:00,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 35.6) internal successors, (178), 4 states have internal predecessors, (178), 2 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:04:00,747 INFO L276 IsEmpty]: Start isEmpty. Operand 28953 states and 39717 transitions. [2021-11-12 23:04:00,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2021-11-12 23:04:00,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:04:00,777 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:04:00,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-12 23:04:00,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-12 23:04:01,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:01,190 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:04:01,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:04:01,190 INFO L85 PathProgramCache]: Analyzing trace with hash 2080184187, now seen corresponding path program 1 times [2021-11-12 23:04:01,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:04:01,192 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1356193752] [2021-11-12 23:04:01,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:04:01,192 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:04:01,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:04:01,193 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:04:01,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-12 23:04:02,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:04:02,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 1416 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:04:02,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:03,669 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-11-12 23:04:03,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:04,867 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2021-11-12 23:04:04,867 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:04:04,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1356193752] [2021-11-12 23:04:04,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1356193752] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:04:04,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [710199655] [2021-11-12 23:04:04,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:04:04,868 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:04,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:04:04,869 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:04:04,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-12 23:04:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:04:05,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 1416 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:04:05,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2021-11-12 23:04:06,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:07,841 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-12 23:04:07,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [710199655] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:04:07,842 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:04:07,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:04:07,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074553204] [2021-11-12 23:04:07,842 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:04:07,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:04:07,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:04:07,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:04:07,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:04:07,844 INFO L87 Difference]: Start difference. First operand 28953 states and 39717 transitions. Second operand has 4 states, 4 states have (on average 57.25) internal successors, (229), 4 states have internal predecessors, (229), 4 states have call successors, (56), 2 states have call predecessors, (56), 2 states have return successors, (55), 4 states have call predecessors, (55), 4 states have call successors, (55) [2021-11-12 23:04:09,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:04:09,845 INFO L93 Difference]: Finished difference Result 63213 states and 87926 transitions. [2021-11-12 23:04:09,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:04:09,846 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 4 states have internal predecessors, (229), 4 states have call successors, (56), 2 states have call predecessors, (56), 2 states have return successors, (55), 4 states have call predecessors, (55), 4 states have call successors, (55) Word has length 331 [2021-11-12 23:04:09,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:04:09,946 INFO L225 Difference]: With dead ends: 63213 [2021-11-12 23:04:09,946 INFO L226 Difference]: Without dead ends: 34293 [2021-11-12 23:04:10,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1320 GetRequests, 1312 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:04:10,015 INFO L933 BasicCegarLoop]: 933 mSDtfsCounter, 292 mSDsluCounter, 787 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 75.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 1720 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.48ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 96.77ms IncrementalHoareTripleChecker+Time [2021-11-12 23:04:10,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 1720 Invalid, 32 Unknown, 0 Unchecked, 4.48ms Time], IncrementalHoareTripleChecker [24 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 96.77ms Time] [2021-11-12 23:04:10,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34293 states. [2021-11-12 23:04:11,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34293 to 29709. [2021-11-12 23:04:12,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29709 states, 23036 states have (on average 1.3451988192394513) internal successors, (30988), 23572 states have internal predecessors, (30988), 4488 states have call successors, (4488), 2143 states have call predecessors, (4488), 2184 states have return successors, (5501), 4209 states have call predecessors, (5501), 4487 states have call successors, (5501) [2021-11-12 23:04:12,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29709 states to 29709 states and 40977 transitions. [2021-11-12 23:04:12,107 INFO L78 Accepts]: Start accepts. Automaton has 29709 states and 40977 transitions. Word has length 331 [2021-11-12 23:04:12,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:04:12,108 INFO L470 AbstractCegarLoop]: Abstraction has 29709 states and 40977 transitions. [2021-11-12 23:04:12,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 4 states have internal predecessors, (229), 4 states have call successors, (56), 2 states have call predecessors, (56), 2 states have return successors, (55), 4 states have call predecessors, (55), 4 states have call successors, (55) [2021-11-12 23:04:12,109 INFO L276 IsEmpty]: Start isEmpty. Operand 29709 states and 40977 transitions. [2021-11-12 23:04:12,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2021-11-12 23:04:12,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:04:12,145 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:04:12,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-12 23:04:12,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-12 23:04:12,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:12,546 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:04:12,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:04:12,546 INFO L85 PathProgramCache]: Analyzing trace with hash 155065615, now seen corresponding path program 1 times [2021-11-12 23:04:12,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:04:12,548 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1678241166] [2021-11-12 23:04:12,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:04:12,548 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:04:12,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:04:12,549 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:04:12,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-12 23:04:13,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:04:13,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 1431 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:04:13,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:14,876 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-12 23:04:14,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:16,133 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-12 23:04:16,133 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:04:16,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1678241166] [2021-11-12 23:04:16,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1678241166] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:04:16,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [336220549] [2021-11-12 23:04:16,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:04:16,134 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:16,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:04:16,135 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:04:16,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-12 23:04:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:04:16,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 1431 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:04:16,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 100 proven. 0 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-12 23:04:18,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:19,440 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 24 proven. 4 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-11-12 23:04:19,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [336220549] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:04:19,440 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:04:19,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 5, 6] total 16 [2021-11-12 23:04:19,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509176501] [2021-11-12 23:04:19,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:04:19,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:04:19,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:04:19,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:04:19,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-12 23:04:19,442 INFO L87 Difference]: Start difference. First operand 29709 states and 40977 transitions. Second operand has 6 states, 6 states have (on average 30.5) internal successors, (183), 5 states have internal predecessors, (183), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 3 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-12 23:04:21,460 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:04:23,624 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:04:25,764 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:04:28,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:04:28,180 INFO L93 Difference]: Finished difference Result 70419 states and 99461 transitions. [2021-11-12 23:04:28,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:04:28,181 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 30.5) internal successors, (183), 5 states have internal predecessors, (183), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 3 states have call predecessors, (33), 2 states have call successors, (33) Word has length 338 [2021-11-12 23:04:28,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:04:28,358 INFO L225 Difference]: With dead ends: 70419 [2021-11-12 23:04:28,358 INFO L226 Difference]: Without dead ends: 40743 [2021-11-12 23:04:28,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1350 GetRequests, 1335 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-12 23:04:28,426 INFO L933 BasicCegarLoop]: 1015 mSDtfsCounter, 443 mSDsluCounter, 3810 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 48 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6394.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 4825 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.20ms SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6497.42ms IncrementalHoareTripleChecker+Time [2021-11-12 23:04:28,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [468 Valid, 4825 Invalid, 79 Unknown, 0 Unchecked, 9.20ms Time], IncrementalHoareTripleChecker [48 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 6497.42ms Time] [2021-11-12 23:04:28,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40743 states. [2021-11-12 23:04:30,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40743 to 29835. [2021-11-12 23:04:30,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29835 states, 23162 states have (on average 1.343320956739487) internal successors, (31114), 23656 states have internal predecessors, (31114), 4488 states have call successors, (4488), 2143 states have call predecessors, (4488), 2184 states have return successors, (5501), 4251 states have call predecessors, (5501), 4487 states have call successors, (5501) [2021-11-12 23:04:30,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29835 states to 29835 states and 41103 transitions. [2021-11-12 23:04:30,936 INFO L78 Accepts]: Start accepts. Automaton has 29835 states and 41103 transitions. Word has length 338 [2021-11-12 23:04:30,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:04:30,937 INFO L470 AbstractCegarLoop]: Abstraction has 29835 states and 41103 transitions. [2021-11-12 23:04:30,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 30.5) internal successors, (183), 5 states have internal predecessors, (183), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 3 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-12 23:04:30,937 INFO L276 IsEmpty]: Start isEmpty. Operand 29835 states and 41103 transitions. [2021-11-12 23:04:30,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-12 23:04:30,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:04:30,965 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:04:31,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-12 23:04:31,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-12 23:04:31,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:31,394 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:04:31,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:04:31,394 INFO L85 PathProgramCache]: Analyzing trace with hash -170556276, now seen corresponding path program 2 times [2021-11-12 23:04:31,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:04:31,395 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1106461320] [2021-11-12 23:04:31,395 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 23:04:31,395 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:04:31,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:04:31,396 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:04:31,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-12 23:04:41,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 23:04:41,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:04:41,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:04:41,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:42,909 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 116 proven. 1 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2021-11-12 23:04:42,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:44,163 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-12 23:04:44,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:04:44,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1106461320] [2021-11-12 23:04:44,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1106461320] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:04:44,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1047567217] [2021-11-12 23:04:44,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 23:04:44,164 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:04:44,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:04:44,165 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:04:44,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-12 23:04:56,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 23:04:56,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:04:56,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 23:04:56,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:04:58,060 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2021-11-12 23:04:58,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:04:59,469 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 26 proven. 2 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2021-11-12 23:04:59,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1047567217] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:04:59,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:04:59,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 5, 6] total 17 [2021-11-12 23:04:59,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762237471] [2021-11-12 23:04:59,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:04:59,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:04:59,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:04:59,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:04:59,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-11-12 23:04:59,472 INFO L87 Difference]: Start difference. First operand 29835 states and 41103 transitions. Second operand has 7 states, 7 states have (on average 26.142857142857142) internal successors, (183), 6 states have internal predecessors, (183), 3 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 4 states have call predecessors, (33), 3 states have call successors, (33) [2021-11-12 23:05:01,509 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:03,806 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:05,978 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:08,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:05:08,713 INFO L93 Difference]: Finished difference Result 71217 states and 100595 transitions. [2021-11-12 23:05:08,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:05:08,714 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 26.142857142857142) internal successors, (183), 6 states have internal predecessors, (183), 3 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 4 states have call predecessors, (33), 3 states have call successors, (33) Word has length 344 [2021-11-12 23:05:08,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:05:08,939 INFO L225 Difference]: With dead ends: 71217 [2021-11-12 23:05:08,939 INFO L226 Difference]: Without dead ends: 41415 [2021-11-12 23:05:08,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1377 GetRequests, 1359 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:05:08,985 INFO L933 BasicCegarLoop]: 1026 mSDtfsCounter, 672 mSDsluCounter, 4389 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 127 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6451.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 719 SdHoareTripleChecker+Valid, 5415 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.12ms SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6569.72ms IncrementalHoareTripleChecker+Time [2021-11-12 23:05:08,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [719 Valid, 5415 Invalid, 180 Unknown, 0 Unchecked, 12.12ms Time], IncrementalHoareTripleChecker [127 Valid, 50 Invalid, 3 Unknown, 0 Unchecked, 6569.72ms Time] [2021-11-12 23:05:09,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41415 states. [2021-11-12 23:05:10,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41415 to 29961. [2021-11-12 23:05:10,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29961 states, 23288 states have (on average 1.3414634146341464) internal successors, (31240), 23740 states have internal predecessors, (31240), 4488 states have call successors, (4488), 2143 states have call predecessors, (4488), 2184 states have return successors, (5501), 4293 states have call predecessors, (5501), 4487 states have call successors, (5501) [2021-11-12 23:05:10,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29961 states to 29961 states and 41229 transitions. [2021-11-12 23:05:10,990 INFO L78 Accepts]: Start accepts. Automaton has 29961 states and 41229 transitions. Word has length 344 [2021-11-12 23:05:10,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:05:10,990 INFO L470 AbstractCegarLoop]: Abstraction has 29961 states and 41229 transitions. [2021-11-12 23:05:10,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 26.142857142857142) internal successors, (183), 6 states have internal predecessors, (183), 3 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 4 states have call predecessors, (33), 3 states have call successors, (33) [2021-11-12 23:05:10,991 INFO L276 IsEmpty]: Start isEmpty. Operand 29961 states and 41229 transitions. [2021-11-12 23:05:11,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-12 23:05:11,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:05:11,005 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:05:11,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-12 23:05:11,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-12 23:05:11,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:05:11,407 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:05:11,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:05:11,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1082303095, now seen corresponding path program 3 times [2021-11-12 23:05:11,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:05:11,408 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1422870151] [2021-11-12 23:05:11,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:05:11,409 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:05:11,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:05:11,409 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:05:11,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-12 23:05:20,623 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-12 23:05:20,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:05:20,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 23:05:20,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:05:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2021-11-12 23:05:21,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:05:23,048 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2021-11-12 23:05:23,049 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:05:23,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1422870151] [2021-11-12 23:05:23,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1422870151] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:05:23,049 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:05:23,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2021-11-12 23:05:23,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053484603] [2021-11-12 23:05:23,050 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:05:23,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 23:05:23,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:05:23,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 23:05:23,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:05:23,054 INFO L87 Difference]: Start difference. First operand 29961 states and 41229 transitions. Second operand has 10 states, 10 states have (on average 19.6) internal successors, (196), 8 states have internal predecessors, (196), 4 states have call successors, (33), 2 states have call predecessors, (33), 5 states have return successors, (34), 7 states have call predecessors, (34), 3 states have call successors, (34) [2021-11-12 23:05:26,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:05:26,197 INFO L93 Difference]: Finished difference Result 60609 states and 83471 transitions. [2021-11-12 23:05:26,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 23:05:26,198 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 19.6) internal successors, (196), 8 states have internal predecessors, (196), 4 states have call successors, (33), 2 states have call predecessors, (33), 5 states have return successors, (34), 7 states have call predecessors, (34), 3 states have call successors, (34) Word has length 350 [2021-11-12 23:05:26,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:05:26,293 INFO L225 Difference]: With dead ends: 60609 [2021-11-12 23:05:26,293 INFO L226 Difference]: Without dead ends: 30681 [2021-11-12 23:05:26,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 691 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:05:26,342 INFO L933 BasicCegarLoop]: 1097 mSDtfsCounter, 1344 mSDsluCounter, 6227 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 763.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1350 SdHoareTripleChecker+Valid, 7324 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 23.29ms SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 910.33ms IncrementalHoareTripleChecker+Time [2021-11-12 23:05:26,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1350 Valid, 7324 Invalid, 307 Unknown, 0 Unchecked, 23.29ms Time], IncrementalHoareTripleChecker [238 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 910.33ms Time] [2021-11-12 23:05:26,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30681 states. [2021-11-12 23:05:28,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30681 to 30411. [2021-11-12 23:05:28,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30411 states, 23618 states have (on average 1.339232788551105) internal successors, (31630), 24070 states have internal predecessors, (31630), 4548 states have call successors, (4548), 2143 states have call predecessors, (4548), 2244 states have return successors, (5711), 4413 states have call predecessors, (5711), 4547 states have call successors, (5711) [2021-11-12 23:05:28,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30411 states to 30411 states and 41889 transitions. [2021-11-12 23:05:28,197 INFO L78 Accepts]: Start accepts. Automaton has 30411 states and 41889 transitions. Word has length 350 [2021-11-12 23:05:28,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:05:28,198 INFO L470 AbstractCegarLoop]: Abstraction has 30411 states and 41889 transitions. [2021-11-12 23:05:28,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 19.6) internal successors, (196), 8 states have internal predecessors, (196), 4 states have call successors, (33), 2 states have call predecessors, (33), 5 states have return successors, (34), 7 states have call predecessors, (34), 3 states have call successors, (34) [2021-11-12 23:05:28,198 INFO L276 IsEmpty]: Start isEmpty. Operand 30411 states and 41889 transitions. [2021-11-12 23:05:28,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2021-11-12 23:05:28,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:05:28,214 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:05:28,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-12 23:05:28,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:05:28,415 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:05:28,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:05:28,415 INFO L85 PathProgramCache]: Analyzing trace with hash -2098266106, now seen corresponding path program 1 times [2021-11-12 23:05:28,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:05:28,417 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1122510474] [2021-11-12 23:05:28,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:05:28,417 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:05:28,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:05:28,418 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:05:28,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-12 23:05:29,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:05:29,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 1476 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:05:29,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:05:30,730 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 239 trivial. 0 not checked. [2021-11-12 23:05:30,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:05:31,960 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2021-11-12 23:05:31,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:05:31,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1122510474] [2021-11-12 23:05:31,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1122510474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:05:31,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [306619698] [2021-11-12 23:05:31,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:05:31,961 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:05:31,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:05:31,962 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:05:31,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-12 23:05:32,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:05:32,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1476 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 23:05:32,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:05:33,644 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-12 23:05:33,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:05:34,487 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-12 23:05:34,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [306619698] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:05:34,488 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:05:34,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-12 23:05:34,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387707744] [2021-11-12 23:05:34,488 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:05:34,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:05:34,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:05:34,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:05:34,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-12 23:05:34,490 INFO L87 Difference]: Start difference. First operand 30411 states and 41889 transitions. Second operand has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 6 states have internal predecessors, (169), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 1 states have call successors, (31) [2021-11-12 23:05:36,611 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:44,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:05:44,428 INFO L93 Difference]: Finished difference Result 85269 states and 122216 transitions. [2021-11-12 23:05:44,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 23:05:44,430 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 6 states have internal predecessors, (169), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 1 states have call successors, (31) Word has length 356 [2021-11-12 23:05:44,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:05:44,601 INFO L225 Difference]: With dead ends: 85269 [2021-11-12 23:05:44,601 INFO L226 Difference]: Without dead ends: 54891 [2021-11-12 23:05:44,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1430 GetRequests, 1413 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-12 23:05:44,658 INFO L933 BasicCegarLoop]: 1753 mSDtfsCounter, 1937 mSDsluCounter, 8127 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 268 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4981.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2013 SdHoareTripleChecker+Valid, 9880 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 25.64ms SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5389.75ms IncrementalHoareTripleChecker+Time [2021-11-12 23:05:44,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2013 Valid, 9880 Invalid, 701 Unknown, 0 Unchecked, 25.64ms Time], IncrementalHoareTripleChecker [268 Valid, 432 Invalid, 1 Unknown, 0 Unchecked, 5389.75ms Time] [2021-11-12 23:05:44,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54891 states. [2021-11-12 23:05:46,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54891 to 30411. [2021-11-12 23:05:47,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30411 states, 23618 states have (on average 1.338978745024981) internal successors, (31624), 24070 states have internal predecessors, (31624), 4548 states have call successors, (4548), 2143 states have call predecessors, (4548), 2244 states have return successors, (5711), 4413 states have call predecessors, (5711), 4547 states have call successors, (5711) [2021-11-12 23:05:47,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30411 states to 30411 states and 41883 transitions. [2021-11-12 23:05:47,097 INFO L78 Accepts]: Start accepts. Automaton has 30411 states and 41883 transitions. Word has length 356 [2021-11-12 23:05:47,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:05:47,098 INFO L470 AbstractCegarLoop]: Abstraction has 30411 states and 41883 transitions. [2021-11-12 23:05:47,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 24.142857142857142) internal successors, (169), 6 states have internal predecessors, (169), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 1 states have call successors, (31) [2021-11-12 23:05:47,098 INFO L276 IsEmpty]: Start isEmpty. Operand 30411 states and 41883 transitions. [2021-11-12 23:05:47,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2021-11-12 23:05:47,113 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:05:47,113 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:05:47,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-12 23:05:47,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-12 23:05:47,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:05:47,518 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:05:47,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:05:47,518 INFO L85 PathProgramCache]: Analyzing trace with hash -2064067786, now seen corresponding path program 1 times [2021-11-12 23:05:47,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:05:47,519 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1821814722] [2021-11-12 23:05:47,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:05:47,520 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:05:47,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:05:47,520 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:05:47,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-12 23:05:48,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:05:48,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 1482 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:05:48,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:05:49,802 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-12 23:05:49,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:05:50,989 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-12 23:05:50,989 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:05:50,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1821814722] [2021-11-12 23:05:50,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1821814722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:05:50,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [535459983] [2021-11-12 23:05:50,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:05:50,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:05:50,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:05:50,991 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:05:50,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-12 23:05:51,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:05:51,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 1482 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 23:05:51,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:05:52,774 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-12 23:05:52,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:05:54,631 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 17 proven. 2 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-12 23:05:54,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [535459983] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:05:54,632 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:05:54,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 5, 9] total 18 [2021-11-12 23:05:54,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82298210] [2021-11-12 23:05:54,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:05:54,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:05:54,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:05:54,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:05:54,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:05:54,634 INFO L87 Difference]: Start difference. First operand 30411 states and 41883 transitions. Second operand has 8 states, 7 states have (on average 24.714285714285715) internal successors, (173), 6 states have internal predecessors, (173), 3 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (35), 4 states have call predecessors, (35), 3 states have call successors, (35) [2021-11-12 23:05:57,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:05:57,933 INFO L93 Difference]: Finished difference Result 61389 states and 84743 transitions. [2021-11-12 23:05:57,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:05:57,950 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 24.714285714285715) internal successors, (173), 6 states have internal predecessors, (173), 3 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (35), 4 states have call predecessors, (35), 3 states have call successors, (35) Word has length 361 [2021-11-12 23:05:57,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:05:58,043 INFO L225 Difference]: With dead ends: 61389 [2021-11-12 23:05:58,043 INFO L226 Difference]: Without dead ends: 31011 [2021-11-12 23:05:58,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1444 GetRequests, 1423 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-11-12 23:05:58,094 INFO L933 BasicCegarLoop]: 776 mSDtfsCounter, 16 mSDsluCounter, 4614 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 352.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 5390 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.45ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 379.72ms IncrementalHoareTripleChecker+Time [2021-11-12 23:05:58,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 5390 Invalid, 119 Unknown, 0 Unchecked, 10.45ms Time], IncrementalHoareTripleChecker [4 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 379.72ms Time] [2021-11-12 23:05:58,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31011 states. [2021-11-12 23:06:00,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31011 to 30591. [2021-11-12 23:06:00,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30591 states, 23738 states have (on average 1.3372651444940602) internal successors, (31744), 24190 states have internal predecessors, (31744), 4608 states have call successors, (4608), 2143 states have call predecessors, (4608), 2244 states have return successors, (5771), 4473 states have call predecessors, (5771), 4607 states have call successors, (5771) [2021-11-12 23:06:00,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30591 states to 30591 states and 42123 transitions. [2021-11-12 23:06:00,239 INFO L78 Accepts]: Start accepts. Automaton has 30591 states and 42123 transitions. Word has length 361 [2021-11-12 23:06:00,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:00,240 INFO L470 AbstractCegarLoop]: Abstraction has 30591 states and 42123 transitions. [2021-11-12 23:06:00,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 24.714285714285715) internal successors, (173), 6 states have internal predecessors, (173), 3 states have call successors, (36), 2 states have call predecessors, (36), 3 states have return successors, (35), 4 states have call predecessors, (35), 3 states have call successors, (35) [2021-11-12 23:06:00,240 INFO L276 IsEmpty]: Start isEmpty. Operand 30591 states and 42123 transitions. [2021-11-12 23:06:00,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-12 23:06:00,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:00,266 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:00,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:00,494 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-11-12 23:06:00,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:00,690 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:00,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:00,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1280359052, now seen corresponding path program 1 times [2021-11-12 23:06:00,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:06:00,692 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2017812331] [2021-11-12 23:06:00,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:00,692 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:06:00,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:06:00,693 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:06:00,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-12 23:06:01,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:01,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:06:01,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:03,048 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-12 23:06:03,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:04,430 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-12 23:06:04,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:06:04,430 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2017812331] [2021-11-12 23:06:04,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2017812331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:04,430 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [635356007] [2021-11-12 23:06:04,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:04,431 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:04,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:06:04,432 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:06:04,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-12 23:06:05,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:05,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 23:06:05,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:06,340 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-12 23:06:06,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:07,344 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-12 23:06:07,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [635356007] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:06:07,345 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:06:07,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-12 23:06:07,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501856536] [2021-11-12 23:06:07,346 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:06:07,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:06:07,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:06:07,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:06:07,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-12 23:06:07,348 INFO L87 Difference]: Start difference. First operand 30591 states and 42123 transitions. Second operand has 7 states, 7 states have (on average 27.571428571428573) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (42), 3 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 23:06:09,422 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:06:17,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:17,835 INFO L93 Difference]: Finished difference Result 83221 states and 118575 transitions. [2021-11-12 23:06:17,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-12 23:06:17,836 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 27.571428571428573) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (42), 3 states have call predecessors, (42), 2 states have call successors, (42) Word has length 362 [2021-11-12 23:06:17,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:17,991 INFO L225 Difference]: With dead ends: 83221 [2021-11-12 23:06:17,991 INFO L226 Difference]: Without dead ends: 52663 [2021-11-12 23:06:18,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1437 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:06:18,043 INFO L933 BasicCegarLoop]: 1459 mSDtfsCounter, 2595 mSDsluCounter, 7122 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 336 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5347.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2674 SdHoareTripleChecker+Valid, 8581 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 28.04ms SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5941.98ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:18,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2674 Valid, 8581 Invalid, 787 Unknown, 0 Unchecked, 28.04ms Time], IncrementalHoareTripleChecker [336 Valid, 450 Invalid, 1 Unknown, 0 Unchecked, 5941.98ms Time] [2021-11-12 23:06:18,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52663 states. [2021-11-12 23:06:20,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52663 to 30555. [2021-11-12 23:06:20,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30555 states, 23726 states have (on average 1.336424176009441) internal successors, (31708), 24166 states have internal predecessors, (31708), 4584 states have call successors, (4584), 2143 states have call predecessors, (4584), 2244 states have return successors, (5723), 4461 states have call predecessors, (5723), 4583 states have call successors, (5723) [2021-11-12 23:06:20,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30555 states to 30555 states and 42015 transitions. [2021-11-12 23:06:20,585 INFO L78 Accepts]: Start accepts. Automaton has 30555 states and 42015 transitions. Word has length 362 [2021-11-12 23:06:20,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:20,586 INFO L470 AbstractCegarLoop]: Abstraction has 30555 states and 42015 transitions. [2021-11-12 23:06:20,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 27.571428571428573) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (43), 2 states have call predecessors, (43), 3 states have return successors, (42), 3 states have call predecessors, (42), 2 states have call successors, (42) [2021-11-12 23:06:20,586 INFO L276 IsEmpty]: Start isEmpty. Operand 30555 states and 42015 transitions. [2021-11-12 23:06:20,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2021-11-12 23:06:20,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:20,604 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:20,642 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-12 23:06:20,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-12 23:06:21,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:21,006 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:21,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:21,006 INFO L85 PathProgramCache]: Analyzing trace with hash -1771637586, now seen corresponding path program 1 times [2021-11-12 23:06:21,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:06:21,008 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1009156944] [2021-11-12 23:06:21,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:21,008 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:06:21,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:06:21,009 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:06:21,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-12 23:06:22,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:22,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 1583 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:06:22,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:23,387 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-12 23:06:23,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:24,794 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 359 trivial. 0 not checked. [2021-11-12 23:06:24,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:06:24,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1009156944] [2021-11-12 23:06:24,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1009156944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:24,794 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [814582821] [2021-11-12 23:06:24,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:24,794 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:24,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:06:24,797 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:06:24,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-12 23:06:25,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:25,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 1583 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:06:25,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:26,225 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-12 23:06:26,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:27,054 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-12 23:06:27,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [814582821] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:06:27,054 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:06:27,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-12 23:06:27,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505902822] [2021-11-12 23:06:27,055 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:06:27,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:06:27,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:06:27,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:06:27,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:06:27,056 INFO L87 Difference]: Start difference. First operand 30555 states and 42015 transitions. Second operand has 8 states, 8 states have (on average 25.125) internal successors, (201), 6 states have internal predecessors, (201), 2 states have call successors, (36), 2 states have call predecessors, (36), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-12 23:06:29,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:29,696 INFO L93 Difference]: Finished difference Result 67558 states and 93934 transitions. [2021-11-12 23:06:29,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:06:29,697 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 25.125) internal successors, (201), 6 states have internal predecessors, (201), 2 states have call successors, (36), 2 states have call predecessors, (36), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) Word has length 371 [2021-11-12 23:06:29,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:29,797 INFO L225 Difference]: With dead ends: 67558 [2021-11-12 23:06:29,797 INFO L226 Difference]: Without dead ends: 37036 [2021-11-12 23:06:29,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1480 GetRequests, 1468 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:06:29,841 INFO L933 BasicCegarLoop]: 1017 mSDtfsCounter, 329 mSDsluCounter, 4809 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 153.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 5826 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.69ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 171.88ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:29,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [379 Valid, 5826 Invalid, 47 Unknown, 0 Unchecked, 6.69ms Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 171.88ms Time] [2021-11-12 23:06:29,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37036 states. [2021-11-12 23:06:31,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37036 to 30759. [2021-11-12 23:06:31,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30759 states, 23876 states have (on average 1.3343106047914224) internal successors, (31858), 24322 states have internal predecessors, (31858), 4584 states have call successors, (4584), 2143 states have call predecessors, (4584), 2298 states have return successors, (5825), 4509 states have call predecessors, (5825), 4583 states have call successors, (5825) [2021-11-12 23:06:31,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30759 states to 30759 states and 42267 transitions. [2021-11-12 23:06:31,962 INFO L78 Accepts]: Start accepts. Automaton has 30759 states and 42267 transitions. Word has length 371 [2021-11-12 23:06:31,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:31,963 INFO L470 AbstractCegarLoop]: Abstraction has 30759 states and 42267 transitions. [2021-11-12 23:06:31,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 25.125) internal successors, (201), 6 states have internal predecessors, (201), 2 states have call successors, (36), 2 states have call predecessors, (36), 4 states have return successors, (36), 4 states have call predecessors, (36), 2 states have call successors, (36) [2021-11-12 23:06:31,963 INFO L276 IsEmpty]: Start isEmpty. Operand 30759 states and 42267 transitions. [2021-11-12 23:06:31,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2021-11-12 23:06:31,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:31,986 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:32,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:32,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:32,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:32,386 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:32,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:32,387 INFO L85 PathProgramCache]: Analyzing trace with hash -99816514, now seen corresponding path program 1 times [2021-11-12 23:06:32,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:06:32,388 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2018552551] [2021-11-12 23:06:32,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:32,388 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:06:32,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:06:32,390 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:06:32,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-12 23:06:33,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:33,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 1598 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:06:33,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:34,861 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-12 23:06:34,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:36,218 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-11-12 23:06:36,218 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:06:36,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2018552551] [2021-11-12 23:06:36,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2018552551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:36,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2086045939] [2021-11-12 23:06:36,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:36,219 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:06:36,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:06:36,220 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:06:36,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-12 23:06:36,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:36,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 1598 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:06:36,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:39,260 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 132 proven. 91 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2021-11-12 23:06:39,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:40,861 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-12 23:06:40,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2086045939] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:40,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785992121] [2021-11-12 23:06:40,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:40,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:40,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:40,864 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:40,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb990b71-8cf2-49c8-8cf3-49b8ee20f931/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process